OVERHEATING

1994 Pontiac Grand Prix

Tiny

Jay Davis

December, 28, 2011 AT 6:03 PM

My 1994 Grand Prix recently overheated. I removed the thermostat and tested it in boiling water. It was bad, so I replaced it. Now the temp guage reads between 150-225 while driving and moves toward the red when stopped. When you accellerate, it comes back down. The water pump looked fine. Is the sensor the likely culprit, or is there something else I need to check?

FOUND 12907 RELATED QUESTIONS

9 Answers

Tiny

Docfixit

December, 28, 2011 AT 6:12 PM

Temp sensor may have been damaged located on rear of engine. Was coolant system air bleed?

Tiny

Jay Davis

December, 28, 2011 AT 6:56 PM

I bled the air according to the procedure in the Haynes manual. When I first started it, there was still air trapped in the heater core though, I could hear it gurgle.

Tiny

Docfixit

December, 28, 2011 AT 6:59 PM

So opened bleeder valve till only coolant came out?

Tiny

Jay Davis

December, 28, 2011 AT 7:01 PM

That is right.

Tiny

Docfixit

December, 28, 2011 AT 7:09 PM

Can Ohm check temp sender @1k cold droping to @80 at 220. What temp is cooling fan coming on?

Tiny

Jay Davis

December, 28, 2011 AT 7:19 PM

I am not sure. Will have to check that.

Tiny

Docfixit

December, 28, 2011 AT 7:23 PM

Maybe fan issue to check if it will operate turn AC on fan should come on to prove its operational

Tiny

Jay Davis

December, 28, 2011 AT 7:27 PM

To Ohm check the temp sensor, do I check resistance between the two terminals?

Tiny

Docfixit

December, 28, 2011 AT 9:29 PM

Yes connector off

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