1970-74 Challenger/Cuda - Speedway Motorsstatic.speedwaymotors.com/pdf/725574074EDZ.pdf · Wiring Notice 6. Engine Compartment Figure 1 7. Condenser, Compressor Bracket, & Passenger

1970-74 Challenger/CudaGen IV

with Factory Air574074-EDZ

907074-EDZ REV E 8/08/14, INST. GEN IV 70-74 CHALNGR/CUDA w/ AC EVAP PG 1 OF 24

an ISO 9001:2008 Registered Company

18865 Goll St. San Antonio, TX 78266 ph: 210-654-7171 fax: 210-654-3113


1. Cover 2. Table of Contents 3. Packing List/Parts Disclaimer 4. Information Page 5. Wiring Notice 6. Engine Compartment Figure 1 7. Condenser, Compressor Bracket, & Passenger Compartment Figures 2 & 3 8. Passenger Compartment (Cont.) Figures 4 & 5 9. Fresh Air Cap & A/C Duct Hose Adapter Installation Figures 6, 7, & 810. Evaporator Installation Figure 911. Evaporator Installation (Cont.) Figures 10, 10a, & 10b12. Firewall Cover Installation Figure 1113. Drain Hose Installation Figures 12 & 12a14. A/C & Heater Hose Installation15. A/C Hose Routing Figures 13 & 13a16. Heater Control Valve Installation Figure 1417. Control Panel Wiring & Duct Hose Routing Figure 1518. Evaporator Hardline & Bracket Installation Figure 1619. Wiring Diagram20. Gen IV Wiring Connection Instructions21. Operation Of Controls22. Troubleshooting Information23. Troubleshooting Information (Cont.)24. Evaporator Kit Packing List

Table of Contents


** Before beginning installation, open all packages and check contents of shipment. Please report any shortages directly to Vintage Air within 15 days. After 15 days, Vintage Air will not be responsible for missing or damaged items.

Packing ListEvaporator Kit (574074-EDZ)

No. Qty. Part No. Description

1.2.

11

744004-VUE784074-PMF

Gen IV 4-Vent Evap. Sub Case 1970-74 Challenger/Cuda with A/C Accessory Kit

1

Accessory Kit784074-PMF

2

Note: Images may not depict actual parts and quantities. Refer to packing list for actual parts and quantities.

OFF

DASH

HOT

FLR

HI

DEF

COLD

AC

Gen IV 4-VentEvap. Sub Case

744004-VUE


Use of Any Other Refrigerants Will Void All Warranties of the Air Conditioning System and Components. Use of the Proper Type and

Amount of Refrigerant Is Critical to Proper System Operation. VintageAir Recommends Our Systems Be Charged By Weight With a Quality

Charging Station or Scale.

Service Info:

Safety Switches:

Important Notice—Please Read

Attention: The following system components are capped: Compressor, evaporator, condenser & drier. Caps may be under pressure with dry nitrogen. Be careful removing caps. Do not remove caps prior to installation. Removing caps prior to installation will cause components to collect moisture and lead to premature failure and reduced performance.

Evacuate the system for 35-45 minutes with system components (Drier, compressor, evaporator and condenser) at a temperature of at least 85° F. On a cool day, the components can be heated with a heat gun OR by running the engine with the heater on before evacuating. Leak check and charge to specifications.

For Maximum System Performance, Vintage Air Recommends the Following:

Heater hose may be purchased from Vintage Air (Part# 31800-VUD) or your local parts retailer. Routing and required length will vary based on installer preference.

Vintage Air Systems Are Designed to Operate With R134a Refrigerant Only! Use of Any Other Refrigerants Is a Fire Hazard and Could Damage Either Your Air Conditioning System or Your Vehicle.

Refrigerant Capacity for Vintage Air Systems:(For other systems, consult manufacturer’s guidelines)

R134a SystemCharge with 1.8 lbs. (1 lb., 12 oz.) of refrigerant.

Lubricant Capacities:New Vintage Air-supplied Sanden Compressor: No additional oil needed (Compressor is shipped with proper oil charge).All Other Compressors: Consult manufacturer (Some compressors are shipped dry and will need oil added).

Your Vintage Air system is equipped with a binary pressure safety switch. A binary switch disengages the compressor clutch in cases of extreme low pressure conditions (Refrigerant Loss) or excessively high head pressure (406 PSI) to prevent compressor damage or hose rupture. A trinary switch combines Hi/Lo pressure protection with an electric fan operation signal at 254 PSI, and should be substituted for use with electric fans. Compressor safety switches are extremely important since an A/C system relies on refrigerant to circulate lubricant.

Heater Hose (Not Included With This Kit):

To ensure a watertight seal between the passenger compartment and the vehicle exterior, for all bolts passing through the cowl and/or firewall, Vintage Air recommends coating the threads with silicone prior to installation.

Bolts Passing Through Cowl and/or Firewall:


Important Wiring Notice—Please Read

Some Vehicles May Have Had Some or All of Their Radio Interference Capacitors Removed. There Should Be a Capacitor Found At Each of the Following Locations:

1. On the positive terminal of the ignition coil.2. If there is a generator, on the armature terminal of the generator.3. If there is a generator, on the battery terminal of the voltage regulator.

Most alternators have a capacitor installed internally to eliminate what is called “whining” as the engine is revved. If whining is heard in the radio, or just to be extra cautious, a radio interference capacitor can be added to the battery terminal of the alternator.

It is also important that the battery lead is in good shape and that the ground leads are not compromised. There should be a heavy ground from the battery to the engine block, and additional grounds to the body and chassis.

If these precautions are not observed, it is possible for voltage spikes to be present on the battery leads. These spikes come from ignition systems, charging systems, and from switching some of the vehicle’s other systems on and off. Modern computer-operated equipment can be sensitive to voltage spikes on the power leads, which can cause unexpected resets, strange behavior, and/or permanent damage.

Vintage Air strives to harden our products against these types of electrical noise, but there is a point where a vehicle’s electrical system can be degraded so much that nothing can help.

Radio interference capacitors should be available at most auto and truck parts suppliers. They typically are cylindrical in shape, a little over an inch long, a little over a half inch in diameter, and they have a single lead coming from one end of the cylinder with a terminal on the end of the wire, as well as a mounting clip which is screwed into a good ground on the vehicle. The specific value of the capacitance is not too significant in comparison to ignition capacitors that are matched with the coil to reduce pitting of the points.

Care must be taken, when installing the compressor lead, not to short it to ground. The compressor lead must not be connected to a condenser fan or to any other auxiliary device. Shorting to ground or connecting to a condenser fan or any other auxiliary device may damage wiring, the compressor relay, and/or cause a malfunction.

When installing ground leads on Gen IV systems, the blower control ground and ECU ground must be connected directly to the negative battery post.

For proper system operation, the heater control valve must be connected to the ECU.

•

•

•


OEM A/C Line

OEM A/C Line

Blower Assembly

OEM Compressor

& Compressor Bracket

Figure 1

OEM Condenser

OEM Drier

Hood LatchAssembly

Engine Compartment

Disconnect battery.Drain radiator.Evacuate the A/C system if necessary.Remove hood latch assembly.Remove OEM condenser and drier.Remove OEM A/C lines from compressor to evaporator.Remove OEM A/C compressor and compressor bracket.Remove OEM blower assembly.Remove OEM evaporator.

1.2.3.4.5.6.7.8.9.

NOTE: Before starting the air conditioner installation, check all components (radio, lights, wipers, etc.) for proper operation, and study the instructions, illustrations and diagrams.


Figure 2

Figure 3

Condenser Assembly & Installation

Compressor & Brackets

Passenger Compartment

Refer to separate instructions included with the condenser kit to install the condenser. Refer to Figure 2, below, for condenser location.

Refer to separate instructions included with the bracket kit to install the compressor bracket.

To ease installation, loosen the top (4) dash mounting bolts located in defrost ducts along the bottom side of the windshield, and the (2) side dash mounting bolts.Pull dash away from windshield to remove (4) OEM defrost duct mounting screws (See Figure 3, below).Remove passenger side OEM A/C duct assembly (See Figure 3, below).Remove driver side OEM A/C duct assembly (See Figure 3, below).Remove OEM defrost duct assembly (See Figure 3, below).

1.

1.

1.

2.

3.4.5.

OEMRadiator

Out In

CoreSupport

07321-VUCDrier

(4) OEMMounting ScrewsOEM Defrost

Duct Assembly

DriverOEM A/C

Duct Assembly

PassengerOEM A/C

Duct Assembly

101008-ECD#8 Condenser Hardline

101006-ECL#6 Drier/Core

Hardline

35368-VCG#6 Condenser/Drier

Hardline


Figure 5

Figure 4

Passenger Compartment (Cont.)Remove the OEM heater/evaporator assembly from under dash as shown in Figure 4, below.

Remove the OEM control panel assembly from dash as shown in Figure 4, below.

Refer to control panel conversion kit instructions for installation of controls.

Using the OEM mounting screw, install the new defrost ducts as shown in Figure 5, below.

1.

2.

3.

1.

Defrost Duct Installation

OEM ControlPanel Assembly

OEM Heater/EvaporatorAssembly

Defrost Duct

OEMScrew

OEMScrew


Figure 6

Figure 8

Figure 7

Fresh Air Cap InstallationUsing (2) #10 x 1/2" sheet metal screws, install the fresh air cap as shown in Figure 6, below.1.

Passenger and Driver SideA/C Duct Hose Adapter Installation

Install the A/C duct hose adapters as shown in Figure 7, below.Install the driver side louver hose adapter on control panel assembly as shown in Figure 8, below.

1.2.

(2) 18247-VUB#10 x 1/2"

Sheet Metal Screws

620073-PMEFresh Air Cap

492077-PMEPassenger Side Louver

Hose Adapter492074-PME

Center LouverHose Adapter

492078-PMEDriver Side Louver

Hose AdapterControl Panel

Assembly


Figure 9

Evaporator InstallationMark front evaporator mounting bracket hole locations on inner cowl (See Figure 10a, Page 11). Once holes are marked in the correct location, drill 1/8" holes in inner cowl for front evaporator bracket mounting location.Mark and drill (2) 9/32" holes for driver/passenger side evaporator rear mounting bracket in firewall (SeeFigure 10b, Page 11).On a workbench, install evaporator rear bracket and hardlines with properly lubricated O-rings (See Figure 13a, Page 15, and Figure 16, Page 18).Install front mounting bracket on evaporator using (2) 1/4-20 x 1/2" hex bolts, and tighten as shown in Figure 9, below.Lift evaporator unit up under the dashboard (See Figure 10, Page 11). Secure loosely to the firewall fromthe engine compartment side using (2) 1/4-20 nuts and washers (See Figure 10, Page 11).Using (2) #14 x 3/4" sheet metal screws, secure the front evaporator mounting bracket to the inner cowl(See Figure 10, Page 11).Verify that evaporator unit is level and square to the dash. Then tighten all mounting bolts. NOTE: Tighten the bolt on the firewall first. Then tighten the front mounting bracket screws.

1.

2.

3.

4.

5.

6.

7.

(2) 1/4-20 x 1/2"Hex Bolts


Figure 10

Figure 10aFigure 10b

Mark & Drill 9/32"Holes

4" 4" 2"

7"1 ⅞"

8 ⅜"8 ¼"

Passenger SideFirewall

(2) 1/4-20 Nutsw/ Washers

Firewall

InnerCowl

View Through Dash

(2) #14 x 3/4"Sheet Metal

Screws

Mark & Drill 1/8"Holes


Figure 11

Firewall Cover InstallationApply 1/4" bead of silicone around the back side of the firewall cover as shown in Figure 11, below.Pass lines through firewall cover, and secure with (2) 7/16" panel retainers (See Figure 11, below).Apply a 1/4" bead of silicone around the back side of the A/C block-off plate as shown in Figure 11, below.Drill (2) 1/8" holes in firewall using the A/C block-off plate as a template (See Figure 11, below).Install the A/C block-off plate using (2) #10 x 1/2" sheet metal screws as shown in Figure 11,below.

1.2.3.

4.5.

Back Sideof A/C Block-off

Plate

Back Sideof Firewall

Cover

(2) #10 x 1/2"Sheet Metal

Screws

Drill (2) 1/8"Holes

(2) 189002-MSR7/16" PanelRetainers

Silicone

Silicone


Figure 12a

Figure 12

Drain Hose InstallationInstall grommets in OEM holes (See Figure 12, below).Install drain hose to the bottom of the evaporator unit and route through the firewall (See Figure12a, below).

1.2.

OEMDrainHole

33133-VUIGrommet

w/ 1/2" Hole

33132-VUIGrommet

DrainHose

Drain


A/C Hose Installation

Modified A/C Hose Kit

Heater Hose & Heater Control Valve Installation

Locate the #8 compressor A/C hose. Lubricate (2) #8 O-rings (See Figure 13a, Page 15) and connect the 135° fitting to the #8 discharge port on the compressor, then route the 45° fitting to the #8 condenser hardline on the fender well (See Figure 13, Page 15). Tighten each fitting connection as shown in Figure 13a, Page 15.Locate the #10 compressor A/C hose. Lubricate (2) #10 O-rings (See Figure 13a, Page 15) and connectthe 90° fitting to the #10 suction port on the compressor, then route the straight fitting to the #10 evaporator hardline coming through the firewall (See Figure 13, Page 15). Tighten each fitting connection as shown in Figure 13a, Page 15. NOTE: Wrap the #10 fitting connections at the firewall with press tape (See Figure 13, Page 15).Locate the #6 evaporator/core hardline. Lubricate (2) #6 O-rings (See Figure 13a, Page 15) and connectthe hardline to the #6 hardline on the fender well from drier. Attach the other end of the hardline with lubricated O-ring to the #6 evaporator hardline coming through the firewall (See Figure 13, Page 15). Tighten each fitting connection as shown in Figure 13a, Page 15. Use a #2 Adel clamp to secure the #6 evaporator/core hardline to the inner fender well as shown in Figure 13, Page 15. Secure the Adel clampto the inner fender using a #10 x 1/2" sheet metal screw.

1.

2.

3.

Refer to separate instructions included with modified hose kit.1.

Route a piece of heater hose from the water pump to the heater line coming through the firewall as shown in Figure 13, Page 15, and Figure 14, Page 16. Secure using hose clamps.Route a piece of heater hose from the intake to the heater line coming through the firewall as shown in Figure 13, Page 15, and Figure 14, Page 16. NOTE: Install heater control valve in line with intake manifold (pressure side) heater hose. Secure using hose clamps as shown in Figure 14, Page 16. Also note proper flow direction.

1.

2.


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FirewallCover

HeaterHose

O-ring#10 Suction

Hose

NOTE: Flow direction followsmolded arrow on valve.

#6 LiquidLine

Figure 14

#10 SuctionLine (Insulated)

Heater Control Valve Installation

Duct Hose Routing & Control Panel Harness

Install duct hoses as shown in Figure 15, Page 17.Plug the control panel harness into the ECU module on the sub case as shown. See Figure 15, Page 17.Route the control panel harness under the center dash assembly and connect the control harness to the PC board assembly on the back side of the control panel as shown in Figure 15, Page 17.Plug the wiring harness into the ECU module on the sub case as shown (Wire according to wiring diagram on Page 19).Reinstall control panel. Refer to control panel conversion kit instructions.Reinstall all previously removed items (battery box & battery).Fill radiator with at least a 50/50 mixture of approved antifreeze and distilled water. It is the owner's responsibility to keep the freeze protection at the proper level for the climate in which the vehicle is operated. Failure to follow antifreeze recommendations will cause heater core to corrode prematurely and possibly burst in A/C mode and/or freezing weather, voiding your warranty.Double check all fittings, brackets and belts for tightness.Vintage Air recommends that all A/C systems be serviced by a certified automotive air conditioning technician.Evacuate the system for a minimum of 45 minutes prior to charging. Perform a leak check prior to servicing.Charge the system to the capacities stated on the information page (Page 4) of this instruction manual.

1. 2. 3.

4.

5. 6. 7.

8. 9.10.11.

From Intake

From Htr Cntrl Vlv


Figure 15

Control Panel & Duct Hose Routing

Back SideOf PC BoardAssembly

Control PanelHarness

From ECU232007-VUR

Driver SideDefrost Duct

2" X 18"

Passenger SideLouver

2 ½" X 48"

Passenger SideDefrost Duct

2" X 16"

Driver SideLouver

2 ½" X 36"

PassengerSide

Louver

CenterLouver

PassengerSide

Center LouverDriver Side

Center LouverDriver Side2 ½" X 20"

Center LouverPassenger Side

2 ½" X 26"

PlugFromWiring

Harness232001-VUR

PlugFrom

ControlWiring

Harness232007-VUR

Driver SideLouver


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WHT/GRN

WHT/YELWHT/RED

RED

WHTBACKLIGHT NEG

FAN WIPER

MODE WIPER

TEMP WIPER

5V-SW

GND

BACKLIGHT POS

AC ANNUNCIATOR

PRE-WIRED

GEN IV WIRING DIAGRAMREV D, 5/6/2014

GEN IV ECU

PROGRAM

Wiring Diagram

TEMP

MODE

FAN

A/C(IF USED)

232007-VUR

232002-VUA

** CIRCUITBREAKER30 AMP

*** WIDE OPENTHROTTLESWITCH

(OPTIONAL)

* DASH LAMP(IF USED)

Dash Lamp Is Used Only With Type 232007-VUR Harness.Warning: Always Mount Circuit Breaker As Close to the Battery As Possible. (NOTE: Wire BetweenBattery and Circuit Breaker Is Unprotected and Should Be Carefully Routed to Avoid a ShortCircuit).Wide Open Throttle Switch Contacts Close Only at Full Throttle, Which Disables A/C Compressor.

JF8

BLK

ORA

TAN

VIEWED FROM WIRE SIDE

••

•

HEATERCONTROL VALVE


RED

CIRCUIT BREAKER30 AMP

+

+

-

BLACK

REDWHITE

RED

CHASSIS GROUND

A/CCOMPRESSOR

RELAY

Ignition Switch:

Dash Light:

NOTE: MOUNT RELAYIN DESIRED LOCATION

UNDER DASH

GREEN

FIREWALL

BLUE

BLUE

RED &

WHITE

VIOLET

(IGNITION HOTTERMINAL)

IGNITION SWITCH

DASH BACK LIGHT+0-12vTAN

GRAY

BLUE

WHITE

WHITE

REDRED

WHITE

COMPRESSOR

BATTERY

NOTE: CONNECT WHITEWIRES DIRECTLY TO

(-) BATTERY TERMINAL

BATRUN

12V

RED GREEN

RED

RED

BLUE

LATCH

BLACK

BINARYSAFETYSWITCH

YELLOW

ORANGE

WIRING HARNESS

Violet 12V Ign Switch Source (Key On Accessory) Position Must Be Switched.

Tan Wire Used Only With Vintage Air Supplied Control Panel With LED Back Light.

Binary: Connect As Shown (Typical Compressor Wiring). Be Sure Compressor Body Is Grounded.

Trinary Switch: Connect According To Trinary Switch Wiring Diagram.

Install With Servo Motor Facing Down, As Shown. Note Flow Direction Arrow Molded Into Valve Body, And Install Accordingly.

White Must Run To (-) Battery. Red May Run To (+) Battery Or Starter. Mount Circuit Breaker As Close to Battery As Possible.

Heater Control Valve:

Binary/Trinary & Compressor:

Circuit Breaker/Battery:

CONTROL WIRING HARNESS

NOTE: YELLOW & ORANGE

COMING FROM HARNESS ARE NOT

USED.

WIRING HARNESS

GRAY WIRE IS USED FOR PROGRAMING CONTROLS

IF APPLICABLE

WIRING HARNESS

Gen IV Wiring Connection Instruction

HEATERCONTROL VALVE

WARNING: ALWAYS MOUNT CIRCUIT BREAKER

AS CLOSE TO THE BATTERY AS POSSIBLE. (NOTE: WIRE BETWEEN BATTERY AND CIRCUIT BREAKER IS UNPROTECTED

AND SHOULD BE CAREFULLY ROUTED TO AVOID A SHORT CIRCUIT).

NOTE: HEATER CONTROL VALVE CONNECTION AND CHASSIS GROUND MAY BE LOCATED ON EITHER SIDE OF THE FIREWALL. ENSURECONNECTOR IS LATCHED

FIRMLY.


Operation of Controls

Adjust to desiredspeed.

Blower SpeedAdjust to desired

speed.

Adjust to desiredmode position (DASH position recommended).

Adjust to desiredspeed.

Adjust to DEFROST position for maximum defrost, or between FLOOR and DEFROST positions for a bi-level

blend (Compressor is automatically engaged).

Adjust to desired temperature.

For A/C operation, adjust tocoldest position to engage

compressor (Adjust between HOT and COLD to reachdesired temperature).

A/C Operation

Heat Operation

Defrost/De-fog Operation

On Gen IV systems with three lever/knob controls, the temperature control toggles between heat and A/C operations. To activate A/C, move the temperature lever/knob all the way to cold and then back it off to the desired vent temperature. For heat operation, move the temperature lever/knob all the way to hot and then adjust to the desired vent temperature. The blower will momentarily change speed, each time you toggle between operations, to indicate the change. NOTE: For proper control panel function, refer to control panel instructions for calibration procedure.

Blower Speed

Blower Speed

This lever/knob controlsblower speed, from

OFF to HI.

This lever/knob controls the mode positions,from DASH to FLOORto DEFROST, with a blend in between.

This lever/knob controlsthe temperature,

from HOT to COLD.

Blower Speed

Mode Control

Temperature Control

Temperature Control

Temperature Control

Temperature Control

Mode Control

Mode Control

Mode Control

For maximum heating, adjust to hottest position (Adjust between HOT and COLD to reach desired temperature).Adjust to desired

mode position(FLOOR position recommended).

NOTE: A/C operation toggles on & off when thermostat lever is moved to the HOT or COLD ends of travel. A/C mode is indicated by the blue A/C light.

OFF HI

DASH DEF

HOT COLD

FLRA C

A/C LightTemperature

Control

ModeControl

Blower Speed

OFF HI

DASH DEF

HOT COLD

FLRA C

OFF HI

DASH DEF

HOT COLD

FLRA C

OFF HI

DASH DEF

HOT COLD

FLRA C


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CU

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in c

ontr

ol hea

d

har

nes

s.

Ver

ify

continuity

to c

has

sis

gro

und w

ith w

hite

contr

ol

hea

d w

ire

at v

ario

us

poin

ts.

Loss

of gro

und o

n t

his

wire

render

s co

ntr

ol hea

d

inoper

able

.

All

oth

er f

unct

ions

work

.Chec

k fo

r dam

aged

blo

wer

sw

itch

or

pote

ntiom

eter

and

asso

ciat

ed w

irin

g.

Blo

wer

sta

ys o

n

hig

h s

pee

d w

hen

ig

nitio

n is

on o

r off.

Unplu

g 3

-wire

BSC c

ontr

ol

connec

tor

from

ECU

. If

blo

wer

sh

uts

off,

ECU

is

eith

er

impro

per

ly w

ired

or

dam

aged

.

Be

sure

the

smal

l, 2

0 G

A w

hite

gro

und w

ire

is c

onnec

ted

to t

he

bat

tery

gro

und p

ost

. If

it

is,

repla

ce t

he

ECU

.

Unplu

g 3

-wire

BSC c

ontr

ol

connec

tor

from

ECU

. If

blo

wer

st

ays

runnin

g,

BSC is

eith

er

impro

per

ly w

ired

or

dam

aged

.

Chec

k to

ensu

re t

hat

no B

SC w

irin

g is

dam

aged

or

short

ed t

o v

ehic

le g

round.

The

BSC o

per

ates

the

blo

wer

by

gro

und s

ide

puls

e w

idth

modula

tion s

witch

ing.

The

posi

tive

wire

to t

he

blo

wer

will

alw

ays

be

hot.

If th

e “g

round”

side

of

the

blo

wer

is

short

ed t

o c

has

sis

gro

und,

the

blo

wer

will

run o

n H

I.

Rep

lace

BSC (

This

will

req

uire

rem

oval

of

evap

ora

tor

from

veh

icle

).N

o o

ther

par

t re

pla

cem

ents

sh

ould

be

nec

essa

ry.

Com

pre

ssor

will

not

turn

on

(All

oth

er funct

ions

work

).

2.

Sys

tem

is

not

char

ged

.Sys

tem

must

be

char

ged

for

com

pre

ssor

to e

ngag

e.Char

ge

syst

em o

r byp

ass

pre

ssure

sw

itch

.

Dan

ger:

Never

byp

ass

sa

fety

sw

itch

wit

h

en

gin

e r

un

nin

g.

Seri

ou

s in

jury

can

resu

lt.

Sys

tem

is

char

ged

.

1b

.

Tro

ub

lesh

oo

tin

g G

uid

e

Chec

k fo

r fa

ulty

A/C

pote

ntiom

eter

or

asso

ciat

ed

wirin

g (

Not

applic

able

to 3

-pot

contr

ols

).

Chec

k fo

r dis

connec

ted o

r fa

ulty

ther

mis

tor.

Chec

k co

ntinuity

to g

round o

n w

hite

contr

ol hea

d w

ire.

Chec

k fo

r 5V o

n r

ed c

ontr

ol hea

d w

ire.

Chec

k 2-p

in c

onnec

tor

at E

CU

housi

ng.

To c

hec

k fo

r pro

per

pot

funct

ion,

chec

k vo

ltag

e at

w

hite/

blu

e w

ire.

Voltag

e sh

ould

be

bet

wee

n 0

V a

nd

5V,

and w

ill v

ary

with p

ot

leve

r posi

tion.

Dis

connec

ted o

r fa

ulty

ther

mis

tor

will

cau

se

com

pre

ssor

to b

e dis

able

d.

Red

wire

at A

/C p

ot

should

hav

e ap

pro

xim

atel

y 5V

with ignitio

n o

n.

White

wire

will

hav

e co

ntinuity

to

chas

sis

gro

und.

White/

Blu

e w

ire

should

var

y bet

wee

n 0

V a

nd 5

V w

hen

le

ver

is m

oved

up o

r dow

n.

3. Com

pre

ssor

will

not

turn

off

(A

ll oth

er funct

ions

work

).

Chec

k fo

r fa

ulty

A/C

pote

ntiom

eter

or

asso

ciat

ed

wirin

g.

Chec

k fo

r fa

ulty

A/C

rel

ay.

Rep

air

or

repla

ce p

ot/

contr

ol w

irin

g.

Rep

lace

rel

ay.

See

blo

wer

sw

itch

chec

k pro

cedure

.


Sym

pto

m C

on

dit

ion

C

heck

s A

ctio

ns

N

ote

s

Sys

tem

will

not

turn

on,

or

runs

inte

rmitte

ntly.

4.

Work

s w

hen

engin

e is

not

runnin

g;

shuts

off

when

en

gin

e is

sta

rted

(T

ypic

ally

ear

ly G

en I

V,

but

poss

ible

on a

ll ve

rsio

ns)

.

Nois

e in

terf

eren

ce f

rom

either

ig

nitio

n o

r al

tern

ator.

Inst

all ca

pac

itors

on ignitio

n c

oil

and a

lter

nat

or. E

nsu

re

good g

round a

t al

l poin

ts.

Rel

oca

te c

oil

and a

ssoci

ated

w

irin

g a

way

fro

m E

CU

and E

CU

wirin

g.

Chec

k fo

r burn

edor

loose

plu

g w

ires

.

Ver

ify

connec

tions

on p

ow

er

lead

, ig

nitio

n lea

d,

and b

oth

white

gro

und w

ires

.

Ver

ify

pro

per

met

er f

unct

ion b

y ch

ecki

ng t

he

conditio

n o

f a

know

n g

ood b

atte

ry.

Ignitio

n n

ois

e (r

adia

ted o

rco

nduct

ed)

will

cau

se t

he

syst

em t

o s

hut

dow

n d

ue

tohig

h v

oltag

e sp

ikes

. If

this

is s

usp

ecte

d,

chec

k w

ith a

qual

ity

osc

illosc

ope.

Spik

esgre

ater

than

16V w

ill s

hut

dow

n t

he

ECU

. In

stal

l a

radio

cap

acitor

at t

he

posi

tive

post

of

the

ignitio

nco

il (S

ee r

adio

cap

acitor

inst

alla

tion b

ulle

tin).

A

faulty

alte

rnat

or

or

worn

out

bat

tery

can

als

o r

esult

in t

his

conditio

n.

Will

not

turn

on u

nder

an

y co

nditio

ns.

Ver

ify

bat

tery

voltag

e is

gre

ater

than

10 v

olts

and les

sth

an 1

6.

Loss

of

mode

door

funct

ion.

No m

ode

chan

ge

at a

ll.Chec

k fo

r dam

aged

mode

switch

or

pote

ntiom

eter

and

asso

ciat

ed w

irin

g.

Part

ial fu

nct

ion o

f m

ode

doors

.

Typic

ally

cau

sed b

y ev

apora

tor

housi

ng

inst

alle

d in a

bin

d in t

he

vehic

le.

Be

sure

all

mounting loca

tions

line

up

and d

on’t h

ave

to b

e fo

rced

in

to p

osi

tion.

Blo

wer

turn

s on

and o

ff r

apid

ly.

6.

Bat

tery

voltag

e is

at

leas

t 12V.

Chec

k fo

r at

lea

st 1

2V a

t ci

rcuit b

reak

er.

Ensu

re a

ll sy

stem

gro

unds

and p

ow

er c

onnec

tions

are

clea

n a

nd t

ight.

Bat

tery

voltag

e is

les

s th

an 1

2V.

5.

Tro

ub

lesh

oo

tin

g G

uid

e (

Co

nt.

)

Chec

k fo

r fa

ulty

bat

tery

or

alte

rnat

or.

Char

ge

bat

tery

.

Sys

tem

shuts

off

blo

wer

at

10V.

Poor

connec

tions

or

wea

k bat

tery

can

cau

se

shutd

ow

n a

t up t

o 1

1V.

7. When

ignitio

n is

turn

ed o

n,

blo

wer

m

om

enta

rily

co

mes

on,

then

sh

uts

off.

This

occ

urs

with t

he

blo

wer

sw

itch

in

the

OFF

posi

tion.

This

is

an indic

ator

that

the

syst

em h

as b

een r

eset

. Be

sure

the

red p

ow

er w

ire

is o

nth

e bat

tery

post

, an

d n

ot

on a

sw

itch

ed s

ourc

e. A

lso,

if

the

syst

em is

pulle

d b

elow

7V f

or

even

a s

plit

sec

ond,

the

syst

em w

ill r

eset

.

Run r

ed p

ow

er w

ire

direc

tly

to b

atte

ry.

Chec

k fo

r posi

tive

pow

er a

t hea

ter

valv

e gre

en w

ire

and

blo

wer

red

wire.

Chec

k fo

r gro

und o

n c

ontr

ol hea

d w

hite

wire.

Chec

k fo

r obst

ruct

ed o

r bin

din

g m

ode

doors

.

Chec

k fo

r dam

aged

ste

pper

m

oto

r or

wirin

g.

Err

atic

funct

ions

of

blo

wer

, m

ode,

te

mp,

etc.

Chec

k fo

r dam

aged

sw

itch

or

pot

and a

ssoci

ated

wirin

g.

Rep

air

or

repla

ce.

8.


Checked By:Packed By:

Date:

1.2.

11

744004-VUE784074-PMF

1

Accessory Kit784074-PMF

2

Gen IV 4-Vent Evap. Sub Case 1970-74 Challenger/Cuda with A/C Accessory Kit

NOTE: Images may not depict actual parts and quantities. Refer to packing list for actual parts and quantities.

OFF

DASH

HOT

FLR

HI

DEF

COLD

AC

Gen IV 4-VentEvap. Sub Case

744004-VUE

Packing ListEvaporator Kit (574074-EDZ)

No. Qty. Part No. Description

Documents

1970-74 Challenger/Cuda - Speedway Motorsstatic.speedwaymotors.com/pdf/725574074EDZ.pdf · Wiring Notice 6. Engine Compartment Figure 1 7. Condenser, Compressor Bracket, & Passenger