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1992 Chevy Suburban over heat when A/C on

Tiny
LOSTINKUWAIT
  • MEMBER
  • 1992 CHEVROLET SUBURBAN
  • V8
  • 2WD
  • AUTOMATIC
  • 375,000 MILES
When I turn on my a/c my truck heats up very fast. From 40c to 100c very fast. Turn the ac off goes right back down. I have put a new 4 core rad new heavy fan clutch and water pump even added some water wetter. Very hard to get here. New a/c compressser new dryer. I thought at first it was just because it was over 40c but it is still doing the same thing now and it is down to 20-25 c. Please help I am tired of changing parts. Thanks mike. Kuwait
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Tuesday, December 4th, 2007 AT 10:46 AM

1 Reply

Tiny
PEAR69
  • MECHANIC
  • 1,482 POSTS
Make sure the a/c compressor is properly charged with oil and coolant. If it's not it will put a heavy load on the engine. Also make sure your A/C clutch is not binding up. Water in extreme heat conditions will evaporate, anti-freeze/coolant like prestone is a must. This has a very high boiling point and will not evaporate. Try taking out the thermostat, this will make the coolant run cooler, but there is a trade off here, your heater will not work as good. Make sure all the fan-blades are intact. Make sure the radiator is clean, especialy in the front. Air must flow through the fins of a radiator evenly. Make sure the radiator is full.
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Tuesday, December 4th, 2007 AT 3:39 PM

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