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Heater Core Bypass
Thread Starter
Drifting
Joined: Jun 2007
Posts: 1,437
Likes: 5
Heater Core Bypass
I recently purchased a Stingray and in short order, the core started to leak. Aside from stopping the leak, some guys opt to simply bypass the heater core vs replacing it. Especially if you live in a warm climate or only drive in warm months.
However, some guys tend to do this to reduce cabin temps. There are many ideas on how to do this. I would like to share mine.
Step One: Get the following part from NAPA; this is 5/8 on one side and 3/4 on the other and will allow you to loop the lines together to bypass the heater core. Also have handy 2 hose clamps.
Step Two: If you want to be environmentally sound, put a pan underneath to catch the coolant that will spill
Step Three: Use a clamping device to gently crimp/squeeze the 5/8 & 3/4 hoses coming from the intake manifold and water pump respectively. This will reduce the spillage.
Step Four: Cut the two hoses down low beside the frame.
Step Five: Pull them through the metal support bracket on the inside of the fender wall and make a loop between the A/C compressor (if equipped) and the fender wall.
Step Six: Connect hoses to the coupler, tighten clamps and add zip-ties for support.
DONE!
However, some guys tend to do this to reduce cabin temps. There are many ideas on how to do this. I would like to share mine.
Step One: Get the following part from NAPA; this is 5/8 on one side and 3/4 on the other and will allow you to loop the lines together to bypass the heater core. Also have handy 2 hose clamps.
Step Two: If you want to be environmentally sound, put a pan underneath to catch the coolant that will spill
Step Three: Use a clamping device to gently crimp/squeeze the 5/8 & 3/4 hoses coming from the intake manifold and water pump respectively. This will reduce the spillage.
Step Four: Cut the two hoses down low beside the frame.
Step Five: Pull them through the metal support bracket on the inside of the fender wall and make a loop between the A/C compressor (if equipped) and the fender wall.
Step Six: Connect hoses to the coupler, tighten clamps and add zip-ties for support.
DONE!
Le Mans Master
Joined: Mar 2001
Posts: 5,738
Likes: 644
From: Lincoln, CA
I bought this.
The hose ends are 5/8" and 3/4" which is an exact fit.
http://www.ebay.com/itm/CAMARO-FIREBIRD-CORVETTE-GTO-HEATER-HOSE-BYPASS-LSx-ENGINES-LS1-LS2-LS3-LS6-LS7-/161319320425?hash=item258f617b69
Then I used brass barbs to connect it.
The hose ends are 5/8" and 3/4" which is an exact fit.
http://www.ebay.com/itm/CAMARO-FIREBIRD-CORVETTE-GTO-HEATER-HOSE-BYPASS-LSx-ENGINES-LS1-LS2-LS3-LS6-LS7-/161319320425?hash=item258f617b69
Then I used brass barbs to connect it.
Melting Slicks
Joined: Oct 2011
Posts: 3,453
Likes: 67
From: Midland Ontario
NCM Sinkhole Donor
Thread Starter
Drifting
Joined: Jun 2007
Posts: 1,437
Likes: 5
Long term, I will plug it, but on a Sunday there wasn't many options (parts wise) and I wanted to 
So for $4.99 and about 10 minutes of time it did the trick
So for $4.99 and about 10 minutes of time it did the trick
Last edited by ALVETTE00; Feb 29, 2016 at 01:26 PM.
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Le Mans Master
Joined: Mar 2001
Posts: 5,738
Likes: 644
From: Lincoln, CA
I have a Big Block with looks like this. The heater hoses run though this tank and the radiator has a separate hose for expansion.
I tied a valve on the hose to block flow but that caused the car to overheat. So I capped the heater core and removed the hoses.
Added the U hose to the back side of the expansion tank and connected the other hose so water flows though it.
I tied a valve on the hose to block flow but that caused the car to overheat. So I capped the heater core and removed the hoses.
Added the U hose to the back side of the expansion tank and connected the other hose so water flows though it.
Melting Slicks
Joined: Mar 2008
Posts: 2,989
Likes: 198
From: Meriden CT
I have a Big Block with looks like this. The heater hoses run though this tank and the radiator has a separate hose for expansion.
I tied a valve on the hose to block flow but that caused the car to overheat. So I capped the heater core and removed the hoses.
Added the U hose to the back side of the expansion tank and connected the other hose so water flows though it.
I tied a valve on the hose to block flow but that caused the car to overheat. So I capped the heater core and removed the hoses.
Added the U hose to the back side of the expansion tank and connected the other hose so water flows though it.
