What would cause a Pontiac G5 to run hot even when heater is on?

Asked by May 21, 2014 at 09:52 AM about the 2008 Pontiac G5 GT

Question type: Maintenance & Repair

The fan does not go on when temp
goes up

3 Answers


The heater in the passenger compartment will not alleviate an overheating problem- and that problem is dangerous to your engine- look at the usual culprits- leak, thermostat, fan switch, fan relay- etc.

1 out of 1 people think this is helpful.

Rad cap,thermostat,cooling temp sensor,water pump,cooling relay1,2 HVAC relay cooling fan all done put freon in A/C still the some. Any idals


Coolant level at the right amount? Low coolant = hot engine. If level is OK then I would suspect a blockage in the system given all the ancillary parts you have changed. Also, make sure your dive belt is not slipping on the water pump pulley.

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