Question about 1996 Chevrolet Impala SS

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Still over heating

I have replaced waterpump, thormol stat, and my radiator on my impala 1996 model 5.7 what is the problem

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On my 94 (106,000 miles) I did the same thing as you with an overheat problem. It came out of the blue one day driving. Had never had a problem before then wham steam everywhere.. Changed the radiator, waterpump, and thermostat and still had overheating. I backflushed everything and hand flushed the coolant tank to get every last bit of gunk out. Still a problem. Was thinking like the last comment - Cracked head. Well are you ready for the solution.... I neglected to check the radiator cap on the coolant tank. It was original to the car and I just didn't think about it. Changed it out for a new one and no more overheating.. It was obviously not holding the system under much pressure. Enough for a short drive but that's all. All that work for a $10.00 part. Makes perfect sense now as Impalas run hotter than a lot of other cars anyway. Need the pressure kept on the coolant to keep it in check.. Hope this helps... Jeff

Posted on Dec 07, 2008

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Timing could be off. Or you could have a cracked head. This would cause air in the water and cause it to over heat.

Posted on Nov 12, 2008

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Of course, the number one issue is the thermostat. If it is too high of a range, or is not opening properly, the 4-core radiator will never be called on.

Next is the possibility that steam/vapor is collecting around the t-stat. I had a big problem with that in an Aries K. Once it got hot enough to open the t-stat a few times the temperature settled down.

If the fan is not doing its job sufficiently you will get overheating at stop lights and in crawling traffic, but cooling that is fine above maybe 15 or 20 MPH.

If the bottom radiator hose has failed, it can collapse due to the suction of the water pump. For the whole length of that hose you should not be able to flatten the hose by hand. It should have a spiral of wire, a "spring," inside it that prevents that. If that wire has corroded, and isn't doing its job you can get compromised flow.

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Next, when the heater hoses get too hot to touch comfortably, but before the engine overheats, the upper radiator hose should start to warm up. The t-stat will start to open, and a little hot water will sneak out of the engine, heating the hose a little. That will introduce a little cold water from the radiator into the water pump, where it will get quickly mixed with the water circulating through the heater system, closing the t-stat pretty quickly. So the initial warming of the upper radiator hose will be pretty slow.

If it overheats before the upper hose gets too hot to touch, you have a t-stat problem. Either the t-stat is failing to do its job, or it is not getting the heat signal it needs to operate properly.

If the heater system is clogged or plumbed wrong, it will not allow the requisite circulation.

I hope this gets you on the road to fixing your overheating problem. A 302 with a mondo radiator as you describe should have no overheating troubles, even in the desert!

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