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#1 |
GM ONLY BABY!!!
Join Date: Oct 2003
Location: Fort Wayne, IN.
Posts: 1,998
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Brand new heater core leaking?
How could a brand new heater core be leaking? I purchased a new heater core for my truck since I was tearing it totally apart for paint, just got it all put back together and noticed antifreeze leaking inside on passengers floor just below heater box. I even rebuilt and painted the whole a/c - heater assembly with new gaskets as well. I doesnt leak all the time, but when I really step on the gas and accelerate it almost runs out. I checked the heater hoses on the firewall and they are tight, no leaks there. Anything else it could be?
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2 wrongs don't make a right, but 3 lefts do. 66 Chevelle Malibu 406ci, 573hp, 10.99@121mph 96 Chevy Silverado Z71 72 GMC 1500 Super Custom LS 6.0/4L65 on airride ![]() ![]() http://www.cardomain.com/ride/707879...mc-c-k-pick-up |
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#2 |
Registered User
Join Date: Aug 2009
Location: St. Paul MN.
Posts: 1,996
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Re: Brand new heater core leaking?
Sorry to here that it is leaking but I have learned to pressure test new heater cores with a garden hose on one end and a plug on the other because I have been burned twice and never again.
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#3 |
GM ONLY BABY!!!
Join Date: Oct 2003
Location: Fort Wayne, IN.
Posts: 1,998
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Re: Brand new heater core leaking?
I guess this is my first burn then. I will test every one I ever buy from now on. Thanks for the input. Not looking forward to the 5+ hour job on a freshly painted truck.
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2 wrongs don't make a right, but 3 lefts do. 66 Chevelle Malibu 406ci, 573hp, 10.99@121mph 96 Chevy Silverado Z71 72 GMC 1500 Super Custom LS 6.0/4L65 on airride ![]() ![]() http://www.cardomain.com/ride/707879...mc-c-k-pick-up |
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#4 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Brand new heater core leaking?
i have seen some times that heater hoses are tightened too much and cause the flimsy nipples they attacth to deform in shape and cause leaks
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#5 | |
Registered User
Join Date: Jun 2010
Location: San Diego Co.
Posts: 1,167
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Re: Brand new heater core leaking?
Quote:
One thing I did read about on this site: Most replacement cores (like anything else) will not fit EXACTLY like the original. So in one case I read about, one of the screws for the hold down brackets was just a tad too long. Long enough to slightly puncture the guy's brand new heater core. Of course, he didn't figure that out until after it was all reinstalled, etc... So, you could check that also.
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1972 Chevy C-10, SWB, Fleet, 350/350, PS, PB, HEI, mostly stock, Survivor. ![]() |
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#6 | |
Registered User
Join Date: Jul 2007
Location: Fall River California
Posts: 2,026
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Re: Brand new heater core leaking?
Quote:
Posted via Mobile Device
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#7 |
GM ONLY BABY!!!
Join Date: Oct 2003
Location: Fort Wayne, IN.
Posts: 1,998
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Re: Brand new heater core leaking?
I used original screws and brackets. Did I mention my truck has a/c? This replacement will not be fun.
Posted via Mobile Device
__________________
2 wrongs don't make a right, but 3 lefts do. 66 Chevelle Malibu 406ci, 573hp, 10.99@121mph 96 Chevy Silverado Z71 72 GMC 1500 Super Custom LS 6.0/4L65 on airride ![]() ![]() http://www.cardomain.com/ride/707879...mc-c-k-pick-up |
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