I've been having a kinda odd problem with my car lately (95 acheiva, 3.1 V-6). The thermostat was sticking, the engine got hot then the temp guage dropped and warning light went away- coolant came out of the overflow tank which has the radiator cap on it.
1) sounds like a bad stat,,, I know around 2000 GM has only one temp sender/sensor,,, the ECT sensor for the electronic engine controls also works the temp gauge,,, when a Gm flys off hot it will turn the temp gauge off and the cooling fans on,,, nice engineering eh! BTW I use OEM stats when possible
I had the thermostat replaced by the local mechanic, and it was fine the next morning on my way to work. That night on my way home the heat worked at first, then after a little while it was blowing cold. It was hot & cold the rest of the way, as I stopped at the farm, the grocery store, etc and went through town.
On the highway I don't notice any problems, other than warming up then going cold for a little bit. The temp guage goes borderline red before the heat comes back and then it drops off below 140 and comes back up.
2) Best i can tell the temp gauge is not lie'n,,, you can tell by heat and no heat,,,, could B a few things,,,, could b air bound,,, they are tuff to git all the air out,,, you would figger that by all the cool down and hot cycles the over flow system would take care of that and it does most of the time,,, check that the tube from the rad to the over flow bottle is not restricted are stopped up,,, replace the rad cap,,, I have seen the nipple were one of the heater hoses connected to the engine rite near the thermostate git stopped up are restricted and also a plugged heater core,,, Gm FWD's will heat if the flow thru the hearer core is restricted,,, Really tho it sounds like its low in coolant,,, low coolant will act zacly as what you have,,, gonna rule out the rad less its leak'n,,, a plugged rad would not recover once it ran hot,,, its possible the water pump impeller has worn/rusted off tho I have never seen this on a 3.1,,, water flow needs to b checked thru the heat core it will explain alot of things,,, intake gaskets are a problem on 3.1 and 3.4's (same engine) ,,, water in oil or oil in water,,, no pattern to'em,,, the fun part of B'n a mechanic izzzzz you marry alot of problems,,, its his problem to verify the correct function of his replacement part or what issue is causing the problem,,,wham bam thank you mamms make ya alot of money,,, good mechanics verify that the customer leaves with a fix the best he can do is use a OEM stat if it fails no harm no foul,,, sounds like a do over if he does not pocess the skills needed to diagnose the problem BTW I don't think its a cool'n fan issue,,, at highway speeds its not needed
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