Heater Core Bypass and Overheating
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Joined: Apr 2008
Posts: 92
Likes: 1
From: Carol Stream Illinois
Heater Core Bypass and Overheating
I have an '82 which had a leaking heater core. Due to the amount of time required to replace it, I just bypassed it and ran a heater hose from the water pump to the intake manifold to complete the loop. Now, the engine is running 60 degrees hotter than it was before. Any ideas or something I am missing? Thanks in advance!
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Drifting
Joined: Aug 2010
Posts: 1,839
Likes: 45
From: nassau co. new york
there were a bunch of other threads on this topic and some members had the same issue you are having and i don't remember hearing that they all were resolved.it doesn't make sense to me either how this could happen.good luck.
Pro
Joined: Mar 2000
Posts: 669
Likes: 80
From: NE USA
If the heater is off, there is no air passing through the heater box taking heat from the heater core coil and in turn the coolant. The coolant temp is unchanged weather it goes through the heater core or not. The only way the heater coil could even effect coolant temp would be to run it with the heater on max fan, wide open all the time. Even then I doubt it would even assist in engine cooling.
Melting Slicks
Joined: Aug 2008
Posts: 2,200
Likes: 3
From: Lehigh county Pennsylvania
Now, the engine is running 60 degrees hotter than it was before. Any ideas or something I am missing?
Pro
Joined: May 2011
Posts: 581
Likes: 5
From: BC
To remove the air loosen the clamp on the intake manifold end of the hose you put on and either remove the hose or wiggle it to one side enough to cause it to leak. Once you see antifreeze coming out tighten the hose. Make sure the rad is full when doing this. Top up the rad when done.
Steve g
Edit: Engine off.
Steve g
Edit: Engine off.
Last edited by Steve2147; Feb 1, 2012 at 09:51 AM.
