Head gasket leak

GARRWK

MEMBER
1993 CHEVROLET SUBURBAN
7.3L
V8
240,000 MILES

Doesn't overheat all the time but it gurgles when you turn the motor off which sometimes fills the reservoir up. Sometimes when radiator cap is off it will spill a little out if the top if radiator at the temperature between 100 and 210 that's what it does. Idling going down the highway sometimes overheats and then not replaced radiator thermostat twice each time with a cooler thermos then the next flushed cooling system numerous times. New clutch fan but still had a tendency to overheat at times. Please help.

1 Reply

KASEKENNY

MECHANIC
18,907 POSTS

This could be a couple of issues. We need to start with what you suspect the issue is which is testing the head gasket. Here is a guide that will help with this:

https://www.2carpros.com/articles/head-gasket-blown-test

Then we need to pressure test the cooling system just to make sure there are no other leaks.

https://www.2carpros.com/articles/radiator-pressure-test

Here is a guide that will talk about the bubbling:

https://www.2carpros.com/articles/vehicle-bubbling-noise

Lastly this could just be a radiator cap so if all this checks out, I would replace the cap and see if it continues.

Please let us know if you have other questions and what you find. Thanks