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 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 325 nationwide G5 listings starting at $995.


Pontiac G5 Experts

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

Related Models For Sale

Used Pontiac G6
37 Great Deals out of 2,803 listings starting at $699
Used Chevrolet Cobalt
22 Great Deals out of 2,569 listings starting at $1,999
Used Pontiac G8
7 Great Deals out of 344 listings starting at $5,000
Used Pontiac Grand Prix
23 Great Deals out of 1,801 listings starting at $800
Used Pontiac Vibe
22 Great Deals out of 808 listings starting at $1,800
Used Honda Civic
395 Great Deals out of 48,377 listings starting at $1,499
Used Ford Mustang
247 Great Deals out of 38,236 listings starting at $1,350
Used Nissan Altima
723 Great Deals out of 65,229 listings starting at $1,000
Used Honda Accord
559 Great Deals out of 103,306 listings starting at $1,225
Used Honda Civic Coupe
83 Great Deals out of 10,713 listings starting at $1,300

Used Cars For Sale

2007 Pontiac G5 GT For Sale
25 listings starting at $2,995

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.