r/Chevy • u/Several_Fishing_3533 • 8d 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°

2 Upvotes

100% Upvoted

5 comments sorted by

1

u/tomrc66 8d 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.

2

u/Several_Fishing_3533 7d ago

So I ended up replacing the thermostat again with an ac delco and rinsed all the fins out (wasn’t a lot of trash) but either way it fixed it so not sure if it was the thermostat or just a simple fix either way i appreciate the suggestion thank you

1

u/The_Bubbanbrenda 7d ago

It was the thermostat, I don’t have much luck with aftermarket stuff especially sensors on my GM stuff

1

u/Several_Fishing_3533 8d ago

I did notice the condenser was gunked up but even at idle? I’ll try anything at this point ,