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No heat in a 1992 Pontiac Bonneville

The hose going to the NEW heater core is hot, but the top one going back to the engine is cold. There is no valve to control the fluid. I have back flushed, changed the thermostat, radiator and water pump all to no avail. The door which regulates the heat is working properly and is adjusted correctly. Does anyone have any idea why the coolant won't flow through the core? If I run the engine in drive vs. over drive, some heat is felt. I've also pinched the hoses thinking there could be an air bubble. This is the second winter with this condition. Car has 236K. It's got me confused...

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  • gary_hey Dec 09, 2008

    I should have noted that, but I tried that as well. I also changed the hoses which I also didn't say anything about. TKS!!!

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Are you sure there is no blockage on the return into the engine? You might try forceing some water through the return hose to the engine while the feed hose to the heater core is off so you can watch
for flow. The only other thing might be low on coolant ( air pocket ). Good luck. Neil W.

Posted on Dec 08, 2008

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===

A coolant system should be flush every two years.

===

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