Over heating

Asked by GuruHY9YN Jul 06, 2019 at 12:09 PM about the Chevrolet Malibu

Question type: Maintenance & Repair

My 1999 Chevy Malibu Will drive fine for the first 20 minutes at the normal temperature.  Then it starts to over heat. I have replaced the head gaskets, replaced the water pump. Changed the radiator. I put in a new temperature sensor. Also replaced the thermostat.  But my car still over heats after 20 minutes and boils over.

1 Answer
101,595

KenF answered 4 years ago

Have you checked fan operation? (making sure they come on when they should?) You can also try a cooling system pressure test, make sure the water jacket isn't compromised in any way. Then check hose and cap to overflow, any cracks can prevent coolant to flow like it should. If still stumped remove thermostat entirely and see if it still overheats.

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