Buick LeSabre Overheating

Asked by Jun 06, 2017 at 09:30 PM about the 2002 Buick LeSabre

Question type: Maintenance & Repair

So about a week ago my 2002 lesabre began overheating on idle. I
changed out the thermostat, and still running hot. Took it to the mechanic,
and found that my normally-red coolant had become chunky clay coloured
so did a full system flush and replaced the busted water pump and radiator
fan sensors that had gone bad. Car worked fine for a few days, then
started overheating again. I replaced the thermostat again, as the
mechanic had warned me that all the sludge they flushed out was likely to
have damaged it. Still running hot. Got a jug of K-seal and ran it through,
still running hot. It seems fine in idle. but about 5 minutes after I start
driving it. it overheats again. Coolant bubbles slightly in the reservoir so I
thought head gaskett, but I've got no other symptoms of it. No leakage
anywhere that I can find. No white in my oil, no oil in my coolant, no white
smoke or water out my tail-pipe. I'm honestly at a loss. Any suggestions?

1 Answer


Possible head gasket. I would test for leaking gasket. You can see for yourself. Run with radiator cap off and observe coolant in radiator. Drain some so it doesn't boil over on You and simulate driving with throttle. Just rev on it about 10 time and smell coolant. You will be able to smell exhaust and gas if head gasket is blown. They also sell a 2 stage tester with chemicals that also test for that.if head gasket is blown. It will need to be repaired.

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