r/Chevy • u/Several_Fishing_3533 • 9h ago

Discussion Chevy 5.3 overheating

I’ve been chasing down this overheating issue for weeks now. I have replaced the thermostat, and it seemed to put a Band-Aid on the fix, after about two weeks, it started overheating again I replaced it with a Murray 182° OE thermostat , I replaced the water pump thermostat sensor. Had to pull the heads off and get them resurfaced. Got all new gaskets they said my heads were warped, flushed the radiator burped the system, installing another thermostat, replace the serpentine belt, replaced the belt tensioner (I heard that could be an issue too) started the truck back up and it’s still overheating

During this process, I turned the heater on and it was blowing cold air at 90°

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u/tomrc66 5h ago

Mine did the same thing, it was the A/C condenser in front of the radiator. After 300,000 miles, it built up a lot of trash and restricted the air flow to the radiator. Rinse or blow it out from the engine side out. I removed the radiator and did mine, no more overheating. It's worth a try.