Why does my car overheat on hills?

10

Asked by May 27, 2017 at 11:42 AM about the 2003 Buick Century

Question type: Maintenance & Repair

My Buick has a new radiator and A/C system. I recently took a trip to Northern Az. We had to climb an incline leaving the valley, and on the way back down. My car got so hot that the temp light came on. What would make it do this suddenly? I checked the radiator, when it cooled off, and it was full.

4 Answers

2,765

does it now over heat in normal conditions ? pull the oil fill cap and look on the bottom , what does the exhaust look like ? let us know what you see .

1 of 1 people found this helpful.
70,995

You may just need a good cooling system flush. Your engine was working harder than usual and if your cooling system is not 100% it may not have been up to the task. If that doesn't solve the problem have the coolant tested for exhaust gases. The 3.1 is known for blowing head gaskets. HTH. -Jim

1 of 1 people found this helpful.
10

When I had the A/C installed, the man worked hard cleaning out the system. It seems that before I bought it in 2011, someone had put "Stop Leak" in it. There was metal everywhere. He said my heater doesn't work, because that system is probably all gunked up, too. It does not get hot around town. That's also the 1st time I've ever taken it up that hill.

1 of 1 people found this helpful.
70,995

Those stop leak products cause more problems than they solve. It's too bad a previous owner put it in there. Try flushing out the cooling system using a chemical cleaner. That may get the rest of the stop leak product out of there. As for the heater you may want to replace the heater core. Also, be sure all air is out of the cooling system. Your mechanic should have a tool to pull the cooling system down into a vacuum for refilling. HTH. -Jim

Your Answer

Century

Looking for a Used Century in your area?

CarGurus has 16 nationwide Century listings and the tools to find you a great deal.

Postal Code:

Buick Century Experts

  • #1
    John Saffrahn
    Reputation
    970
  • #2
    Tom Demyan
    Reputation
    800
  • #3
    John Pate
    Reputation
    550
View All

Related Models For Sale

Used Buick LeSabre
14 listings starting at $4,395
Used Buick Regal
6 Great Deals out of 270 listings starting at $6,995
Used Chevrolet Impala
151 Great Deals out of 1,055 listings starting at $1,500
Used Honda Accord
78 Great Deals out of 915 listings starting at $1,411
Used Toyota Camry
95 Great Deals out of 2,284 listings starting at $1,781
Used Chevrolet Malibu
96 Great Deals out of 2,060 listings starting at $1,485
Used Ford Focus
88 Great Deals out of 2,604 listings starting at $999
Used Honda Civic
295 Great Deals out of 3,138 listings starting at $995
Used Chevrolet Camaro
3 Great Deals out of 836 listings starting at $12,907

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.