1999 GMC Sonoma Overheating

1999 GMC SONOMA
168,576 MILES • 4 CYL • 2WD • AUTOMATIC
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GREGORY101
  • MEMBER
  • 1 POST
Yes I was driving yesterday and I turned on the A/C. I was stopped at the stop light and looked at the temp gauge it was running way to hot. I turned off the A/C and the truck cooled down. What is wrong with it
Jul 18, 2009 at 7:37 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Check the coolant level in the radiator/also make sure both of the cooling fans are on when AC is on. Could be a coolant temperature sensor, engine temperature sending unit and relay problem.
Jul 18, 2009 at 12:56 PM
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