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Originally Posted by bermis519
I have a 2000 impala with the same problem also...and i had my intake gaskets replaced. I know the malibu, monte carlo and the impala are very identicle, some have the same parts and motors. Well if my impala sits with nothing running, the heater the a/c, it will go past the half way mark, but it will come back down after a few minutes and then repeat the process. When I'm driving down the road, it will stay at about 2-3 notches over the first quarter of the guage. If i have the heat running it goes down to a convincing level, same with the air conditioning. I have taken it in to have it checked and they said it was fine. More then likely it's probably going to be fine, but i just don't understand the big temp fluxuation between driving down the road and idleing. I just don't feel comfortable to let it sit and run for a ten minute time frame or longer. I noticed the cooling fans kick on for only a few seconds and then shut back off, seems kinda retarded. But thats my side of the story...
mike
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When your driving down the road the majority of the heat generated by the engine is disapated by the airflow across the radiator and engine. Usually the fans come on when idling, when cool air is at a minimum.
I wouldn't let the 3100 idle for too long in the hot weather. I've even turned on the heater when stuck in traffic to help keep the engine cooler.