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1997 Chevrolet C K 1500 Base Reg Cab 117.5 WB (CMI)

1997 Chevrolet C K 1500
Trim Info:
Rear Wheel Drive, Reg Cab 6.5' Fleetside
17 mpg city / 22 mpg hwy
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January 4, 2013, 10:35 am

Rob B
 

Question: air filling cooling system causing overheating

Hi, I'm stumped. Air is getting into my cooling system and it causes my car to overheat. I can't figure out the issue.
I've changed the thermostat, radiator cap, and pressure tested.pressure test seemed to come out good.I can hear bubbles swishing through the heater core when I accelerate. I don't smell coolant in the exhaust nor do I see signs of it in the oil. The truck runs fine after I purge it but after driving it and then letting it cool down it starts to overheat again so I have to purge it again. there is a slight, minute leak in the intake. I doubt it would be enough to suck this much air in but idk. All replies are appreciated. Thanks Rob.

Engine-95 chevy 5.7l TBI c1500


January 13, 2013, 3:41 pm

Elizabeth K
Expert Mechanic

It sounds like a head gasket leak from the combustion chamber to the water jacket. Check for air bubbling up through the radiator overflow tank while running the engine up to 2500 rpm or so. Or you can do a compression leak-down test to see if there is air escaping to the radiator. If that ends up being the problem, you'll have to replace the cylinder head gasket.


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