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

1,875

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.
69,275

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.
69,275

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

Add photo

Related Questions

  • Why does my car overheat on hills? 4 answers

    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 o...

    2003 Buick Century

    -

    Maintenance & Repair

  • Why does my car turn off when I put it in dribe 1 answer

    Why does my car turn off when I put it in drive

    1991 Buick Century

    -

    Maintenance & Repair

  • Why does my car suddenly quit running abruptly after about 2 minutes? 3 answers

    Without notice,this Buick Century just began losing power and quitting after I bought it.It may run for 45 minutes in idle,without an issue,or it might just crank and not start at all..OR it might r...

    1996 Buick Century

    -

    Maintenance & Repair

  • My car running hot 1 answer

    Why is my car running hot at a stand still

    2000 Buick Century Custom

    -

    Maintenance & Repair

  • my car doesnt have heat 1 answer

    my 2005 Buick Century wouldn't heat up, It only Defrost the windshield some what

    2005 Buick Century Custom

    -

    Maintenance & Repair

Century

Looking for a Used Century in your area?

CarGurus has 820 nationwide Century listings starting at $1,999.

ZIP:

Search Buick Century Questions

Buick Century Experts

#1 John Saffrahn
John Saffrahn
Reputation 960
#2 Tom Demyan
Tom Demyan
Reputation 790
#3 John Pate
John Pate
Reputation 520
View All

Related Models For Sale

Used Buick LeSabre
20 Great Deals out of 1,887 listings starting at $1,588
Used Buick Regal
167 Great Deals out of 9,947 listings starting at $3,500
Used Chevrolet Impala
570 Great Deals out of 34,638 listings starting at $1,000
Used Buick Park Avenue
4 Great Deals out of 432 listings starting at $1,800
Used Chevrolet Malibu
1,204 Great Deals out of 77,913 listings starting at $1,500
Used Toyota Camry
1,062 Great Deals out of 72,952 listings starting at $1,000
Used Honda Accord
980 Great Deals out of 62,412 listings starting at $999
Used Chevrolet Tahoe
609 Great Deals out of 35,844 listings starting at $1,000
Used Toyota Corolla
925 Great Deals out of 65,989 listings starting at $1,995
Used Ford Taurus
257 Great Deals out of 17,924 listings starting at $1,499
Used Ford Focus
742 Great Deals out of 52,917 listings starting at $990
Used Ford Mustang
725 Great Deals out of 42,692 listings starting at $1,300

Used Cars For Sale

2004 Buick Century For Sale
73 listings starting at $1,999

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.