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2001 Chevy Monte Carlo 2001 Chevy Monte Carlo temperature g

Tiny
WOODTURNER2
  • MEMBER
  • 2001 CHEVROLET MONTE CARLO
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 89,000 MILES
01 Monte with 3.8 temp guage works some times some times not. When the guage stops and drops all the way down the engine fans come on and I get code 128. I have checked when the guage is not working and there is 5 volts going to the sensor. I have also checked the resistance of the sensor hot and cold and it is good. What do I check next?
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Saturday, November 22nd, 2008 AT 5:00 PM

3 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Try replacing the thermostat Po128 is a range problem with thermostat. When the event occours the thermo closes providing no coolant to operate sensor or gauge. The gague drops PCM turns fans on to prevent overheating code Po128 sets.
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Sunday, November 23rd, 2008 AT 3:04 PM
Tiny
WOODTURNER2
  • MEMBER
  • 6 POSTS
Yes it was the thermostat
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Tuesday, November 25th, 2008 AT 9:21 AM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Glad to have helped Have A great Thanksgiving
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Tuesday, November 25th, 2008 AT 3:23 PM

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