Overheating engine. 2005 Pontiac Bonneville what would cause my engine to overheat?

Asked by Mar 05, 2019 at 12:05 PM about the 2005 Pontiac Bonneville

Question type: Maintenance & Repair

My radiator is full to the
top. Looks too full to
me. Overflow tank is up
to full line. Found
antifreeze on the ground
under the car and heater
barely warm. Why?

1 Answer


You should first try to locate where the coolant on the ground is coming from. It may be a leaky hose joint that can be tightened or many other things - blockages, leaky heater core or radiator, stuck thermostat, bad water pump, air in the system (if work has been done just previously), bad radiator cap, bad temp sensor, defective cooling fans........take you pick. But first try to determine where the leak is coming from and, if you are seeing a trouble light, have the car scanned for any codes.

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