2006 Pontiac G6 intermittent A/C and themostat gauge

Tiny
TODD BIRON
  • MEMBER
  • 2006 PONTIAC G6
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 89,000 MILES
My a/c will stop running. The compressor shut down and the temp guage reads 100(does not move off 100 even as car warms up. Engine does not seem to be over heated, nor does performance decrease. If I unhook battery to reset system, compressor begins to work and temp gauge works properly. This will last sometimes a day, sometimes 20 minutes. Is there a sensor or relay possibly that controls both the compressor and temp gauge or is it possibly something in the computer?
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Monday, August 3rd, 2009 AT 9:50 PM

12 Replies

Tiny
DOCFIXIT
  • EXPERT
Hi
Either Engine Coolant Tempeture sensor located on right rear engine. AT operating temp remove connector and check resistence across ECT terminals. Should read 241 ohms if not replace. or ECM fault is engine light coming on? Also is AC manual or Automatic?
Let me know
Thanks for donate


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Tuesday, August 4th, 2009 AT 9:33 AM
Tiny
TODD BIRON
  • MEMBER
The a/c is manual. I did a test last night and eliminated the a/c as part of the problem. I reset the system and did not run the a/c, the temp gauge crashed back to no reading 20 miles or so down the road. I do like the suggestion that it may be the temp sensor. I will r/r that and see if it cures problem.
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Tuesday, August 4th, 2009 AT 2:30 PM
Tiny
DOCFIXIT
  • EXPERT
O.K. Keep me posted be on line most of tomorrow
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Tuesday, August 4th, 2009 AT 2:38 PM
Tiny
JASON7447
  • MEMBER
Hello,

I'm having this same problem. I have replaced the coolant temp sensor with a GM part, but the problem persists. Any other suggestions?
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Friday, September 4th, 2009 AT 8:17 AM
Tiny
DOCFIXIT
  • EXPERT
Does temp gague responde normaly? Has AC charge been checked?
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Friday, September 4th, 2009 AT 2:00 PM
Tiny
JASON7447
  • MEMBER
It responds normally most of the time, but will occasionally drop to 100 (the lowest it goes). At that point, A/C does not work and the engine fan runs. I suspect the computer does not see the temp, so for over heating precautions it doesn't allow a/c and turns the fan on
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Friday, September 4th, 2009 AT 5:23 PM
Tiny
DOCFIXIT
  • EXPERT
Check ECT as described in earlier post
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Saturday, September 5th, 2009 AT 2:02 PM
Tiny
DLIGHTSEY
  • MEMBER
Same problem, replaced the ECT and it still happens. I can pull the battery cable, and do a computer reset, but after about 10min, the gauge goes to 100 (lowest) and the A/C quit? Very strange, anybody find a solution?
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Saturday, October 15th, 2011 AT 3:11 AM
Tiny
TESLEYC
  • MEMBER
Word for word, having the exact same problem. I replaced the ect sensor and after unplugging the battery to reset the engine light everything went back to normal for a day. Ac back, temp gauge read the temp. Then after a day, light came on again, ac not cold, temp read 100 (needle does not move). Same code as before read at autozone. The only thing I haven't done it change the therm but if the therm was bad then when the gauge does decide to work it would be reporting irregular temp changes. Unplugged the battery again and reset the engine light. All is back to normal again gauge and ac working. We will see how long it lasts. Could it be the wire connection to the ect sensor?
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Tuesday, November 22nd, 2011 AT 6:12 AM
Tiny
DOCFIXIT
  • EXPERT
What was code?
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Monday, November 28th, 2011 AT 3:16 PM
Tiny
TESLEYC
  • MEMBER
If I remember correctly it was 128 said the engine is operating at a normal temperature and gave the following possible solutions: low coolant (but my level is full), faulty thermostat (but it is still working), or defective engine coolant temperature sensor (which I replaced but the same problem keeps arising). Since my last post it has improved, it works more often than not but intermittently that temp gauge will drop and the a/c compressor stops clicking on, sometimes it will come back in the middle of driving. Sometimes I have to disconnect the battery to get it to work right again.
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Tuesday, November 29th, 2011 AT 9:13 PM
Tiny
RIVERMIKERAT
  • MEMBER
Check the grounds for the instrument cluster and the ECT. Also check the grounds for the ECU. Does the AC compressor cycle at all while the problem is occurring?
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Friday, December 2nd, 2011 AT 6:25 AM

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