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Auto Parts and Repairs
Chevy Tahoe
Thermostats
Temperature

Why would the temperature gauge fluctuate randomly either cooler or getting hotter after having the thermostat replaced?

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Wiki User
2004-10-22 03:20:23
2004-10-22 03:20:23

Some cars have ground wires connected on the Thermostat housing bolts & the wires break. SOME aftermarket Thermostats (EL CHEEPO'S) are total JUNK.NAME Brands are best 2 go with.HOPEFULLY (IT) is installed correctly-SOME U have a 50/50 chance -The thremo Bulb goes away from the radiator .

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Check into the temperature control valve--this is different than the thermostat.

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Is you Geo Tracker overheating or the temperature is running almost hot then you need to change you thermostat

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either your low on anti-freeze or the thermostat is broken. i just changed my thermostat today and i cost $11 so it won't hurt to get it replaced even if your not sure its broken.

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When the thermostat and radiator were replaced, coolant could have dripped into an electrical connector or a sensor could be disconnected or damaged. Check the temperature sensor and crankshaft sensors first.

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If your engine takes a much longer time for the thermostat heat guage to reach its required level of operatiing temperature then the thermostat may be stuck in the open position which means that it will need to be replaced.

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Be careful there is a temperature coolant switch mounted next to the thermostat housing. I thought this was the sensor and replaced it by mistake. There is another sensor.

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If the car is overheating or if the temperature gauge is not coming up to normal operating temperature which is normally half way up the gauge then the thermostat needs replacing. As the water pump should be replaced at the same time as the cam belt every 90,000 miles, you should also replace the thermostat and coolant.If the car is overheating or if the temperature gauge is not coming up to normal operating temperature which is normally half way up the gauge then the thermostat needs replacing. As the water pump should be replaced at the same time as the cam belt every 90,000 miles, you should also replace the thermostat and coolant.

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The thermostat is done it has to be replaced.......

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There is an engine temperature sensor that operates the cooling fan.

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Low coolant? Wrong thermostat temperature range? Heater core plugged,restricted or airbound? Water pump not circulating coolant? Temperature control cable not adjusted properly?

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Does that mean that you replaced the thermostat AND the sensor? If not, you really need to replace the thermostat. A sticking thermostat can cause temperature swings and potentially overheat the engine. BTW, BMW engines tend to have serious problems when they overheat. Don't let it overheat or you might be buying a new engine.

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I would guess that the thermostat is not opening at the proper temperature. Once it does open proper circulation brings it down to the correct operating temperature. I think it should be replaced.

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Can not be repaired, only replaced with the thermostat housing as one unit.

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You don't. You replace a thermostat that has failed. They are meant to be replaced.

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If the temperature gauge is reading below normal operating temp after driving a little while it may be that your thermostat is stuck open. I replaced my thermostat and it fixed mine.

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Most of the time it is because the thermostat has gone bad and is not opening at the proper temperature. Cure: replace thermostat. If the thermostat has been replaced, flush the radiator. Buildup of residue in the bottom of the radiato0r will cause overheating, but it is maintained over heating, not temporary.

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The thermostat or the fan relay for the radiator fan. If the temperature gauge shows the engine to be hot the fan should be on. If the fan isn't on you can check it by removing the electrical connection to the temperature sensor. If the fan is all right it will come on by default when the wiring connector is removed. Usually it is the thermostat which needs to be replaced when the engine is overheating. If the top hose going to the radiator isn't hot when the temperature gauge shows the engine to be hot the thermostat is stuck shut and should be replaced.

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If the engine is taking a long time to warm up or the gauge registers low heat the thermostat probably is stuck open and needs to be replaced. If the engine runs hot check the temperature of the upper radiator hose. If it's not hot the thermostat is stuck closed and should be replaced. If the upper hose is hot it means the thermostat is open and working. Cooling problem could be restricted radiator.

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If the thermostat has failed it will need replaced.

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In general, engine thermostats can be found by following the LOWER radiator hose to where it attaches to the engine. The hose is typically attached to a fitting behind which is a gasket and the thermostat. The gasket needs to be replaced when the thermostat is replaced.

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Since you had to unplug the wire connector, there is most likely damage to the connector. Check it carefully.


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