heater core leak - Team Camaro Tech
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post #1 of 5 (permalink) Old Aug 12th, 02, 09:14 AM Thread Starter
Join Date: Aug 2001
Location: BC Canada
Posts: 28
i have just replaced my heater core for the second time, and it is leaking again right away. does the heater core unit have to be sealed with the case? i can't understand why it would be leaking immediately after installing it.
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post #2 of 5 (permalink) Old Aug 12th, 02, 10:00 AM
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Join Date: Jun 2000
Location: milwaukee, wi, usa
Posts: 241
Is it possible that you are putting undue pressue on the tubes that come out of the heater core itself, that stick out into the engine compartment that the heater hoses are attached too and causing a leak where they are pressed into the core itself? My son was putting the core back into the car on our 67 and he put too much pressure on one of them and it actually came loose and out of the core itself! It looked like the tubes were only soddered into the core and he broke them loose.
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post #3 of 5 (permalink) Old Aug 12th, 02, 10:39 AM
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Join Date: Sep 2000
Location: Shrewsbury, MA, USA
Posts: 6,509
Always check the core in the store when you pick it up. I ordered one from NAPA and you could see a 1/4" break in the solder where one of the tubes went into the core. The tube was actually loose. It probably got dropped during shipping and broke the tube. I handed it right back to the guy behind the desk and he got me another one. I would have be quite upset if I had put it in the car and then found out it was junk.

Mark Canning
1969 Indy Pace Car
350/300HP RPO Z11
My 69 L48 - 350/300HP Engine
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post #4 of 5 (permalink) Old Aug 12th, 02, 10:47 AM
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Join Date: Aug 2000
Location: mid-Missouri
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Make sure your radiator cap isn't rated for a much higher pressure than needed.

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post #5 of 5 (permalink) Old Aug 12th, 02, 03:21 PM
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Join Date: Nov 2001
Location: Oxford Pa.
Posts: 503
Do a quick check...
This is a no brainer and please don't take it as an insult, but before You take it apart again just make sure the hose clamps are properly sealing the hose to the tubes...
I've seen them seep, the coolant would follow the tubes inside and give the appearance of a leaky core....
Good Luck!!!
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