Reply To: 2004 Quest Engine Temp & AC

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#11181

Oldman
Participant

Coolant temp sensor may be sending a high temp reading to the ECU, which may stop the A/C compressor. When temp goes down the a/c compressor engages again. Why the temp fluctuates, you may have a coolant leak from head gasket or something else, like a bad thermostat. Is your check engine light on? Look for misfire P0300 code or some specific cylinder (P0301-0306). You may get a code for coolant temp out of range (P0116)

  • This reply was modified 1 year, 2 months ago by  Oldman.