Overheating

20

Asked by Aug 28, 2016 at 01:39 PM about the 1999 Buick Century Custom

Question type: Maintenance & Repair

I have a 1999 Buick Century with the 3100 engine,
it ran hot on the interstate so flushed with hose
while running and went out of state, came back 3-4  
days later and it overheated again, found a crack in
the neck of radiator, now I have replaced the
radiator, new cap, new water pump, new hoses top
and bottom, new heater hose that comes off water
pump, new thermostat, new temperature sensor at
thermostat housing, went ahead and bypassed
heater core, bled air out of both bleeders numerous
times...does fine at 35-40 mph in town, get on the
interstate, it still runs hot...HELP ! ! !

5 Answers

61,325

Usually when an engine heats up at expressway speeds it's a coolant circulation problem. Did you flush out the system with a chemical cleaner? Might be a good idea. You might have partially clogged passages in the engine causing poor circulation. Any signs of a blown head gasket? White "goop" on the oil dipstick, for example. If this is a high mileage engine you may be looking at a worn timing chain as well. But I'd only go there as an absolute last resort. HTH. -Jim

1 out of 1 people think this is helpful.
20

Car doesn't show typical blown head gasket symptoms ie: oil looks clean, not watery or milky, no smoke in tailpipe, no water at tailpipe, runs strong, not missing, head could be blown between cylinders I guess and not shown signs yet. I have now taken the thermostat out and car seemed to get real hot even faster. I see that these 3100 engines are notorious for blowing intake manifold gaskets...anyway, water seems to get hot (boiling) and just blows right out overflow reservoir, then temp gauge inside the car of course pegs out and temp light comes on, at that point, if I open bleeders, nothing but steam or just hot air...

1 out of 1 people think this is helpful.
61,325

The system could have air in it. It's actually the 3800s that have the intake gasket failures. The 3100s do oftentimes blow head gaskets. If it was blown between cylinders you'd have a misfire condition with both those cylinders due to lack of compression. Use a cooling system pressure tester and pressurize the system to 15 PSI. It should hold for 15 minutes minimum. If not, you've got a leak somewhere. Also, with the system under pressure from the pressure tester start the engine. If the needle on the pressure tester gauge bounces, the head gasket is blown. HTH. -Jim

20

Thanks Jim...I will definately try the pressure tester...

1 out of 1 people think this is helpful.
61,325

You're welcome. Glad to help. Please keep us posted on your findings. -Jim

Your Answer

Add photo

Related Questions

  • Overheating 1 answer

    Sister has a 02 Buick century its overheating but the radiator cap doesn't get hot... Replaced the thermostat last yr I believe. There's cooliant in the overflow an all that good stuff. Jus don't k...

    2002 Buick Century

    -

    Maintenance & Repair

  • Overheating 2 answers

    2005 buick century automatic overheats but drop in down in 3rd gear it runs at normal temperature

    2005 Buick Century Base

    -

    Maintenance & Repair

  • 2002 Buick century overheating 3 answers

    Cars been overheating changed thermostat did not work then put new radiator in still overheating what other possibilities could it be

    2002 Buick Century Custom

    -

    Maintenance & Repair

  • Car overheating 1 answer

    My 1999 buick century was overheating,I took it to the shop and they said it was the radiator because the fluid was leaking so we replaced it with a used one in august and it was ok for a couple we...

    1999 Buick Century Custom

    -

    Maintenance & Repair

  • overheating 2 answers

    overheating

    2002 Toyota Sequoia SR5

    -

    Maintenance & Repair

Century

Looking for a Used Century in your area?

CarGurus has 1,071 nationwide Century listings starting at $3,300.

ZIP:

Search Buick Century Questions

Buick Century Experts

#1 John Saffrahn
John Saffrahn
Reputation 870
#2 Tom Demyan
Tom Demyan
Reputation 730
#3 John Pate
John Pate
Reputation 400
View All

Related Models For Sale

Used Buick LeSabre
11 Great Deals out of 2,343 listings starting at $1,795
Used Buick Regal
121 Great Deals out of 10,946 listings starting at $1,850
Used Chevrolet Impala
795 Great Deals out of 34,381 listings starting at $799
Used Buick Park Avenue
511 listings starting at $1,400
Used Honda Accord
812 Great Deals out of 81,598 listings starting at $899
Used Toyota Camry
1,101 Great Deals out of 96,247 listings starting at $1,250
Used Nissan Altima
1,085 Great Deals out of 82,542 listings starting at $670
Used Ford Taurus
255 Great Deals out of 20,464 listings starting at $1,500
Used Buick Skylark
103 listings starting at $1,384
Used Chevrolet Malibu
1,003 Great Deals out of 85,673 listings starting at $1,995
Used Honda Civic
669 Great Deals out of 77,405 listings starting at $1,000