Question about 1998 Pontiac Bonneville

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Temperture gage doesn't raise above 125 used to be 200

Still getting heat always stand at 200 when after running it to worknow never goes over 125 could the tempastate be stuck or need new radorator cap

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The thermostat could be stuck open. Remove the cap when the the motor is cold. Start the engine and look in hole to see if the coolant is flowing if it is then replace the thermostat.

Posted on Mar 31, 2014


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Maybe you didn't bleed all of the air out of your coolant systtem.
I had a very similar problem, last month, my heat would not go above 50 degrees F.

I had air in my heater core.

I put wheel blocks behind the back tires and engaged the emergancy brake.
I jacked the front of my van up so both tires were off the ground (about 3")
I removed the radiator cap, started the engine, and turned the heat on high.
I added antifreeze, until it was full.
I let the engine continue to run, as I watched the antifreeze level go back down, then I added more antifreeze.
After doing this 2 times, I squeezed and held the upper radiator hose. I did not release it.
I started pouring more antifreeze in and when it started to over-flow, I still kept pouring as slowly released the hose.
With the raditator level full, I replaced the cap and put some antifreeze in the coolant reservoir.
Lowered the front back to the ground and removed the tire blocks.
I stuck a guage in the inside vent and I now get a 125 degree reading.

Note...after I got the van jacked up, it only took me 15 minutes to get the air out of the system (mainly, because I squeezed and held the hose).

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