so I just installed my 3rd heater core in 1 year - why? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-29-2006, 11:57 AM   #1
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Default so I just installed my 3rd heater core in 1 year - why?

93 SE

Original replaced last october, made it to march, had to replace again. In July, it was leaking again, where I bypassed it and finally replaced it last weekend. My question - why would I be blowing out heatercores? Everything runs fine, just hit 150K. Never done an "official" flush, but have done the equivelent of 2-3 accidental flushes through blown cores and replacing the plastic fitting that goes into the intake (behind the alternator) which poured out a vast majority of coolant.

Any ideas or comments I'd greatly appreciate~JS
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Old 09-29-2006, 12:02 PM   #2
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Are they blowing out at the side where the metal and plastic meet?

If so..I'd think the pressure cap may be bad and you are building too much pressure. But that'* a guess at this point.

Either that..or the parts supplier may have a bad batch.
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Old 09-29-2006, 03:44 PM   #3
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Have you replaced the pressure cap any time? Right pressure? New one?
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Old 09-30-2006, 11:21 AM   #4
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I replaced mine a few months ago, and the new core was all aluminum, instead of plastic and aluminum as the original heater core was. No problems so far.

Got it off e-Bay for $23, by the way.
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Old 09-30-2006, 09:08 PM   #5
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The first two were from the same Napa store. The core is all aluminum. There weren't obvious holes where it was leaking. I have never replaced the radiator cap - you think that would be the problem? I figured that if the spring was weak with age it would result in LESS pressure, rather than overpressuring. Maybe a bad guess on my part. Maybe a new cap wouldn't hurt, being that they are cheap.
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