Question about 1998 Buick Century

1 Answer

'98 Century--Sporadic over-heating

Can't figure this out! Have flushed radiator and replaced with new coolant. Sporadic over-heating, usually in Winter. Added stop leak since fluid was continually low, does not seem to accept coolant from resevoir. Blows cold air until gauge is far too high and then comes back down to mid-range. Will change thermostat and hope for the best! Any suggestions on problem or BEST way to change thermostat as I've had problems with bolts stripping in the past. Thanks a million!!

Posted by on

  • Anonymous Jan 23, 2009

    Might Be An Engine module chip, happened to my car, replaced it and it drove fine after that.

  • Anonymous Apr 12, 2009

    I had the same problem and took it in to a shop. Indeed, purging the coolant system of air fixed the problem, but I was told that the problem was caused by old and cracking gaskets, which was common for this make/model. They recommended I make sure to keep an eye on my coolant levels to prevent future air bubbles and to have the gaskets replaced asap ($800), as it was possibly leaking coolant into the valve chamber along with the air intake and causing damage there.



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Buick Master
  • 6,674 Answers

Be sure to have heater (not defrost) on when refilling rad with coolant, and leave cap off until rad fan has come on & off 2 or 3 times, then replace cap. Airlocks are common on vehicles cooling systems, and will cause symptoms you are describing.

Posted on Jan 24, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Coolant light come on which indicates an overheating condition

You can never run water in the system, water will boil. You must have a 50/50 coolant/water.

Have the system flushed, the radiator can become restricted from old coolant, the fins have very small ports for flow and can become blocked leading to less cooling.

No thermostat means full flow, so this should not be running hot.

Usually the only way a water pump goes bad is when they leak, they are a direct drive, and the propeller never wears out unless at some point someone had to high of a coolant mixture.

Get the system flushed to clean it and have it made into a 50/50, can't have mostly water, coolant dissipates the heat.

If flushing does not help, the cheapest first thing is a new radiator, or get a new core for it, that's cheaper.

Apr 03, 2013 | 1998 Chevrolet Lumina

1 Answer

My 1998 century over heats

Check condition and operation of thermostat.
Check operation of radiator cooling fan when hot.
Check radiator coolant level. If low, then perform a cooling system pressure check to identify cause of leak.
Check coolant condition. If using water only, then corrosion may build up within system and cause blockages. If blocked, then flush system and refill with anti freeze-water mixture of 50/50.

Nov 07, 2012 | 1998 Buick Century

1 Answer

I can't locate the radiator drain plug on my 2001 buick century. Help!

Not all radiators have them, just remove the lower radiator hose and spray hot water through it from the top till it comes out clear, usually works better anyhow... Note: if your coolant is nasty and all brown and gummed up its cause you have a leaking intake gasket and oil is mixing with your coolant,, if this is the case you may have to replace the radiator as well as the gasket on the intake..

Jun 14, 2012 | 2001 Buick Century

1 Answer

I have a 2003 Impala with a 3.4 with 237000 miles . Have a sporadic overheating problem. Car will be running.fine then the heat will blow cool and the car will quickly overheat. After a few minutes the...

The is likely air trapped in your cooling system and as it moves the problem comes and goes. Check your coolant level and apply vacuum to the surge take to evacuate the air pockets.

Dec 16, 2010 | 2003 Chevrolet Impala

2 Answers

Draincock for radiator on 1999 buick century

they are usually at the bottom of the radiator but some radiators do not have them, you have to remove the radiator hose at the bottom of the tank to allow the coolant to drain out

Jun 12, 2010 | 1999 Buick Century

2 Answers

Car begins to over heat when idle. anti freeze in radiator and had a flush and fill

check the radiator coolant fan,or the R C fan relay. If radiator coolant fan went out your car will over heat when idle .

May 04, 2010 | 1996 Buick Century

3 Answers

How to change a thermostat on a 95 buick century 6c

follow your top radiator hose to top of the engine, where it hooks up with a hose clamp. under that metal housing is your thermostat! usually 2 or 3 bolts you remove , then lift off the metal housing and take out your old thermostat and remove the old gasket with a razor blade.. install your new thermostat and gasket and away you go!! richie

Nov 03, 2009 | 1995 Buick Century

1 Answer

Over heating

try flushing the may have some restrictions in the motor, but first remove the radiator cap before it gets to hot,but hot enough for the thermostat to be open,and make sure you have flowing coolant.If not your water pump is bad.The fluid should be moving quite a bit.

Mar 16, 2009 | 1998 Cadillac Catera

Not finding what you are looking for?
1998 Buick Century Logo

238 people viewed this question

Ask a Question

Usually answered in minutes!

Top Buick Experts


Level 3 Expert

83096 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22382 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a Buick Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides