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1994 Grand Prix overheating

Tiny
JAY DAVIS
  • MEMBER
  • 1994 PONTIAC GRAND PRIX
  • 187,000 MILES
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?
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Wednesday, December 28th, 2011 AT 6:03 PM

9 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Temp sensor may have been damaged located on rear of engine. Was coolant system air bleed?
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Wednesday, December 28th, 2011 AT 6:12 PM
Tiny
JAY DAVIS
  • MEMBER
  • 9 POSTS
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.
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Wednesday, December 28th, 2011 AT 6:56 PM
Tiny
DOCFIXIT
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So opened bleeder valve till only coolant came out?
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Wednesday, December 28th, 2011 AT 6:59 PM
Tiny
JAY DAVIS
  • MEMBER
  • 9 POSTS
That is right.
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Wednesday, December 28th, 2011 AT 7:01 PM
Tiny
DOCFIXIT
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Can Ohm check temp sender @1k cold droping to @80 at 220. What temp is cooling fan coming on?
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Wednesday, December 28th, 2011 AT 7:09 PM
Tiny
JAY DAVIS
  • MEMBER
  • 9 POSTS
I am not sure. Will have to check that.
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Wednesday, December 28th, 2011 AT 7:19 PM
Tiny
DOCFIXIT
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Maybe fan issue to check if it will operate turn AC on fan should come on to prove its operational
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Wednesday, December 28th, 2011 AT 7:23 PM
Tiny
JAY DAVIS
  • MEMBER
  • 9 POSTS
To Ohm check the temp sensor, do I check resistance between the two terminals?
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Wednesday, December 28th, 2011 AT 7:27 PM
Tiny
DOCFIXIT
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Yes connector off
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Wednesday, December 28th, 2011 AT 9:29 PM

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