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.

1 people found this helpful.

Your Answer:

Pontiac Bonneville Experts

  • #1
  • #2
  • #2
View All

Find great deals from top-rated dealers


Related Models For Sale

Used Pontiac Grand Prix
41 listings starting at $3,995
Used Chevrolet Impala
29 Great Deals out of 790 listings starting at $1,200
Used Pontiac GTO
4 listings
Used Dodge Charger
62 Great Deals out of 881 listings starting at $3,944
Used Chevrolet Monte Carlo
15 listings starting at $6,950
Used Buick Regal
8 Great Deals out of 116 listings starting at $4,995
Used Chevrolet Malibu
41 Great Deals out of 2,420 listings starting at $2,799
Used Buick LeSabre
4 listings
Used Nissan Altima
48 Great Deals out of 1,525 listings starting at $1,995
Used Pontiac Grand Am
23 listings

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. Content will be removed if CarGurus becomes aware that it violates our policies.