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.

2 of 2 people found this 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.

Your Answer


Looking for a Used G5 in your area?

CarGurus has 426 nationwide G5 listings starting at $2,990.


Pontiac G5 Experts

  • #1
  • #1
  • #3
    Tom Demyan
View All

Related Models For Sale

Used Pontiac G6
58 Great Deals out of 3,829 listings starting at $1,250
Used Chevrolet Cobalt
28 Great Deals out of 3,524 listings starting at $1,800
Used Pontiac G8
10 Great Deals out of 418 listings starting at $4,500
Used Pontiac Grand Prix
19 Great Deals out of 2,579 listings starting at $1,450
Used Jeep Grand Cherokee
974 Great Deals out of 72,392 listings starting at $1,200
Used Honda Civic
736 Great Deals out of 65,158 listings starting at $1,350
Used Chevrolet Malibu
1,053 Great Deals out of 63,770 listings starting at $880
Used Ford Focus
782 Great Deals out of 57,535 listings starting at $1,900
Used Mitsubishi Eclipse
27 Great Deals out of 1,177 listings starting at $1,999
Used Chevrolet Impala
554 Great Deals out of 35,108 listings starting at $1,495

Used Cars For Sale

2009 Pontiac G5 GT For Sale
22 listings starting at $3,550

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.