Question about 1994 Pontiac Grand Prix

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Temp gauge will go to hot then back down to cool back to hot then to cool ,the system has been bled for air ,could this be my thermastat

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  • Pontiac Master
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That sounds logical and like the thermostat could be sticking. Replacement is the only cure. Before you tackle that check that the fans are coming on when they should. Fans that are slow or late turning on could also create a symptom like this. Hope this helps.

Posted on Oct 11, 2010

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Posted on Jan 02, 2017

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I have a 2003 chevy impala. just changed the thermastat because the temperature was fluxuating. Since changing the thermastat the temperature gage constantly read in the red, however the coolant level...


You probably need to bleed the cooling system properly.

Open the cooling system bleeder screws.

Slowly fill the cooling system with a 50/50 coolant mixture until coolant runs freely out of bleeder screws.
Close the cooling system bleeder screws
Install the coolant pressure cap
Start the engine.
Run the engine at 2,000 - 2,500 RPM until the engine reaches normal operating temperature. (midway on gauge)
Allow the engine to idle for 3 minutes.
Shut the engine off.
Allow the engine to completely cool.
Top off the coolant as necessary.
Run engine again at 2000 - 2500 RPM until the engine reaches normal operating temperature.
Allow engine to idle until cooling fans come on. It should come on with the gauge about 3/4 of the way to red. - if it gets to where is touches the red, shut down immediately.
When the fan comes on, put your hand behind the fan and observe the temperature of the air coming from the fan. It should feel hot. If it is blowing cold air, the coolant is not circulating through the radiator like it should. This could be caused by lots of things including an improper/defective thermostat, corroded water pump impeller, or a blown head gasket.

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sounds as though u may have a base engine problem ie: head gasket, as long as you are sure u bled all the air out of the cooling system using the 2 bleeder screws.

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Why does my thermostat gage keep going from cold to hot constantly


I really would like some clarification on that.
If your inside gauge seems to read cold for a while and then just goes hot it generally means either the gauge is sticking or much more likely the thermostat is sticking because it is about to go bad. Actually it has gone bad already if it is staying closed. Now most thermostats have a little bypass hole to let air and small amounts of water through to circulate all the time. this allows the hot water to actually reach the thermostat when it is mounted somewhat from the heat source. If that hole becomes plugged it will give the same effect since the entire engine has to get hot before the thermostat can even start opening. Once it starts opening it gets a rush of super hot water that slams it wide open.
If you don't notice any problems with the engine like water boiling over or any other strange behavior then it is likely the actual gauge in the dash sticking or the sensor malfunctioning.
What you want to do is take a laser temp gauge and get a temp reading off the radiator when the engine is reading hot. this will give you an idea whether or not it is lying to you. bring it over and ill lend you mine. ;)

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