2004 Gran Prix 3800 6cyl overheated, some coolant & engine oil lost replaced thermostat, No fix. Is it likely head gasket, cracked head or block? Which is most likely?twice

Asked by haljag Nov 26, 2015 at 09:04 AM about the 2004 Pontiac Grand Prix GT1

Question type: Maintenance & Repair

radiator replaced 6 years ago  coolant mix seems to have been bad as it looked like rust in cooling system.  Thermostat looked all gummy.

1 Answer

F_O_R answered 8 years ago

A six year old radiator may need replacement but like Tom said the head gaskets may need replacement. At the very least you need to use a good cooling system cleaner and flush the engine and radiator out really good.

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