K-Series Coolant Port Adapter (K20Z3 / K24)
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Easy Bleed system designed to let air out of the cool-ant
-16AN threaded housing which allows for direct use of AN
IACV & Heater line delete option
3D CNC machined billet aluminum & hard anodize finish
This product may not be legal for highway use. Hybrid Racing is
not responsible for any direct or indirect, actual or incidental
expense attributed to the use of any performance parts sold by
Hybrid Racing LLC. Purchasers
agree to all of the terms of this agreement upon the purchase of
Important!! Please read the entire install guide twice before
starting your instal-lation. No, really its a good idea to read it
twice before you begin so everything
goes smooth ;)
(x1) Coolant housing
(x1) Laser cut gasket
(x4) Housing mounting bolts
(x1) -16AN threaded hose neck
(x1) -6ORB Plug
(x1) -8ORB Plug
(x1) -8ORB Heater hose adapter (if optioned)
(x1) -6ORB Nipple (if optioned)
(x1) Heater hose pipe bracket (if optioned)
(x2) Heater hose pipe bracket bolts (if optioned)
(x1) Rubber hose for IACV function (if optioned)
Hybrid Racing coolant port adapter base kit Hybrid Racing
coolant port adapter base with optional heater hose and IACV
STEP 1: Remove the radiator cap and open the lower drain port on
your radiator to drain the cooling sys-tem. We suggest doing this
when the coolant is cool.
STEP 2: Remove air intake system. (The car pictured uses the
Hybrid Racing cold air intake kit. The re-moval of the OEM airbox
is slightly different.
Remove the engine wiring from
the bracket. Pull the tabs outward
to slide the plastic cover away
from the engine.
With a 10mm socket, remove the
bolt that holds the wire harness
stay in place.
STEP 4a: Remove the wire harness stay
STEP 5: With a 12mm socket, remove the
OEM air intake support bracket
STEP 5a: Remove the OEM air intake sup-
STEP 6: Remove the coolant hose that
connects to the IACV.
(If you choose to use the IACV
with the HR coolant port, you will
should remove both sides of the
STEP 6a: Remove the upper radiator hose.
STEP 7: On the rear of the OEM coolant
housing, remove the heater
STEP 8: With a 12mm socket, remove the
nut that holds the heater hose
pipe in place.
Locate and bend the heater hose
pipe up and away from the OEM
This is necessary for removal,
otherwise the coolant housing
will not have enough room to
slide off the studs.
STEP 10: With a 12mm socket, remove the
two upper nuts, and two lower
The coolant housing should now
be free. You may have to wiggle
it loose as it can get stuck to the
Slide the coolant housing away
from the engine and remove.
(You may have to pull the heater
hose pipe out of the way.)
STEP 12: Once the coolant housing is off,
take one of the nuts and spin it
STEP 12a: Once the first nut is on, take an-
other nut and thread it on. Tight-
en them together.
Unscrew the first nut and the
stud should back out of the cylin-
der head. Do this for both upper
STEP 13: Install the gasket with the tab on
top. Take two of the included
bolts and stick them through the
(The coolant housing should
come assembled if you optioned
to include the heater hose and
STEP 13a: Install the coolant housing using
the supplied hardware.
Once all are threaded in, tighten
them in a crossing sequence.
STEP 14: Bend the heater hose coolant
pipe mounting tab back into
place. The hole should align with
the supplied bracket.
Re-install the stock wire harness
STEP 16: Re-install the front bracket using
the OEM bolt.
STEP 17: If optioned, install the rear heater
hose using the OEM clamp.
If you are not using a heater
hose, make sure the plug is
threaded in and is tight.
If using the IACV, install the sup-
plied extended coolant hose. Use
the OEM clamps.
If you are not using the IACV, in-
stall and tighten the plug.
STEP 19: Re-install the upper coolant
STEP 20: Fill system and make sure the
engine does not overheat.
If you are having trouble remov-
ing air from your coolant system,
you can open the bleeder screw
located on the top of the coolant
The install is complete!
Do I need the optional heater hose and bracket kit? Depending on
your application, the retention of the heater hose may not be
necessary. Most K-Series swap cars will not use the heater
attachments, while most 06-11 Civic Si applications will. While the
system can be used either way for either setup, choose which best
suits your goals.
I cant get the OEM coolant port housing off, it wont slide off.
You may need to bend and wiggle the heater hose hard pipe a bit.
There is very little room in the engine bay so you may need to get
creative. Removing the wiring harness and heater pipe com-pletely
will make it easier but is a lot of work. Try removing it without
having to remove those parts.
I cant get all of the air out of the coolant system Make sure
the radiator cap is the highest point of the coolant system. If the
upper radiator hose is, install the rad cap and use the bleeder
valve on the coolant port adapter. Get the system up to temperature
and open the valve. It should bubble and let the trapped air out.
Tighten the valve and continue to add coolant.
What coolant should I use? We recommend using the OEM Honda
50/50 coolant mixture.
Is the coolant housing ready to install when I get it? Depending
what options you choose, the coolant port housing should come fully
assembled. However, it is in good interest to make sure that all of
the parts are fully tightened before installing. It is MUCH easier
to tighten them on a table versus on the engine.
Can I use the OEM gasket? No. The OEM gasket is stamped metal
and therefor will not seal correctly with out housing.
Trouble Shooting & FAQs Tips and tricks to help you get it
If you have any questions or comments, please email support at
Users assume all cost and risk associated with these or any
other items purchased from Hybrid Racing LLC. Parts sold or
manufactured by Hybrid Racing LLC may not meet legal requirements
for use on public roads. People thinking about purchasing
product(s) from Hybrid Racing LLC should check with their local and
state authorities for legality. It is the users re-sponsibility to
know and comply with all local and federal laws and regulations.
Use or installation of Hybrid Racing LLC products may affect user
insurance and/or vehicle warranty coverage. It is the users sole
responsibility for consequences that may occur due to having the
product installed in his/her vehicle. Hybrid Racing LLC assumes no
legal responsibilities and/or liabilities, whether to us-ers
vehicle, engine, person(s), and/or property(s), that result from
the use of, or servic-ing of a vehicle of which a Hybrid Racing LLC
product has been installed/attempted to be installed, or to any
other vehicle(s) and/or person(s), regardless of whether or not
this product has any involvement directly or indirectly and/or
liability, and/or whether or not proper installation has been
carried forth. All engines, engine parts and electrical components
are for OFF ROAD USE ONLY/RACING VEHICLES ONLY. They are not for or
to be used on public roads in the USA. Acquisition of a Hybrid
Racing LLC product will act as an acknowledgement of the le-gal
disclaimer stated herein. Hybrid Racing LLC reserves the right to
change this disclaimer at any time without any prior consent or
Should you need to contact us our details are as follows: Hybrid
Racing LLC, 12231 Industriplex Suite B, Baton Rouge, LA 70809