Question about 1992 GMC Sierra

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No heat just replaced heat core 6 months ago. then a week ago added stop leak to radiator and followed directions and now no heat

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Some of your hoses may be clogged up. I suggest having your radiator flushed and your thermostat changed. The thermostat causes more or less water to flow according to water temperature. This is what keeps your engine at a good temperature.

Posted on Dec 24, 2008

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How to repair the heater core


Depends on what the heater core is made of.
All repair shoppes would replace the core, and not try to fix it.
Back 30 years ago, they were repairable, as they were made of brass and copper, and could be soldered.
Today, they are usually plastic and/or aluminum, and are supposed to be replaced when they go bad.
You could try some good "stop leak" in your radiator, and leave the heater on for a few weeks to get the water to circulate from the radiator to the engine to the heater, but alas, I've never had that work yet, and I have tried about 20 times (on 20 cars).
Stop leak would sure be cheaper that having the core replaced.
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Not the radiator is your problem. loosing coolant without leak the thermostat is the problem.
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I just got all the fluids topped off a month ago. The car started to smell when I turned the heater on 2 weeks ago, and then began to overheat for the first time. When I checked the radiator, it was bone...


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