The temperature guage drops when accelerating

Tiny
HEATHBARR
  • MEMBER
  • 1998 PONTIAC SUNFIRE
  • 180,000 MILES
The temperature guage drops when accelerating. We've changed the engine temp sensor and the thermostat, but still the same problem. Have bled the air out of the coolant system. Any ideas on the problem and how to fix it?
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Monday, October 29th, 2012 AT 12:19 AM

3 Replies

Tiny
ASEMASTER6371
  • CERTIFIED MECHANIC
The temp sensor for the computer or the sender unit for the gauge? What did you change?

Roy
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Monday, October 29th, 2012 AT 12:21 AM
Tiny
HEATHBARR
  • MEMBER
The sensor that shows up as Code 118 on the OBD2
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Monday, October 29th, 2012 AT 12:23 AM
Tiny
RIVERMIKERAT
  • CERTIFIED MECHANIC
Your engine's temperature should drop a little when you accelerate because more air is flowing across the radiator. How much of a drop are you talking about? Check the alternator output, at idle and when you increase the engine speed. Do any of the lights seem to dim a little when you accelerate?
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Wednesday, October 31st, 2012 AT 11:11 PM

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