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, 8 months ago by Oldman.