20 Most Recent 1999 Buick Century Questions & Answers

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My 1999 buick century making a rumbling noise in the rear had all struts and rear wheel bearings replaced.

check rear itself--u-joints --proper install of struts /bearings
12/6/2021 11:41:01 PM • 1999 Buick... • Answered on Dec 06, 2021
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Where is the oil sending unit located on a 1999 Buick Century

Near the oil filter .
8/26/2021 9:16:19 AM • 1999 Buick... • Answered on Aug 26, 2021
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Headlights dont work unless holding dimmer switch for bright lights

I would think the problem lies with the dimmer switch on the steering column, since this is a very expensive part please have a local dealer confirm my guess.
7/21/2021 10:01:54 AM • 1999 Buick... • Answered on Jul 21, 2021
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1999 Buick Century Custom _

nope you have to replace them.when brake booster diaphram leaks you cant plug them.i have bought one at salvage yard in good shape.until i got a new one.get your brake booster from inside salvage yard where they stock them inside out the weather.dont take any brake booster off old outside cars been in all kinds bad weather. there vacuum diaphram probably dried up will leak also.
12/1/2019 6:28:23 PM • 1999 Buick... • Answered on Dec 01, 2019
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1999 buick century oil capacity

HI. The cap will be 4 1/2 Quarts. That will include the filter as well.
2/21/2019 3:40:59 AM • 1999 Buick... • Answered on Feb 21, 2019
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What is the freon capacity of my 1999 Buick century?

most cars have it printed on decal the body under hood it will say 134-a capacity 2.3lb ,when adding Freon allways follow detailed instructions .if system has been emptied you may have to use Freon with oil in it
2/21/2019 3:38:34 AM • 1999 Buick... • Answered on Feb 21, 2019
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Headlights will not turn on after sunset. I have to turn the headlights on manually. It use to work. I believe it maybe a modular. Please help me with my 1999 Buick, Century

there is a light sensor locate up in defrost area of dash cover that controls the on and off of head lights
10/27/2018 3:27:49 PM • 1999 Buick... • Answered on Oct 27, 2018
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I have a 99 buick century that the headlights just

Your high beam switch is bad most likely.
2/3/2018 9:41:31 PM • 1999 Buick... • Answered on Feb 03, 2018
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Was driving fine stopped at a red light the car made like a grinding noise when i gave it gas it stopped i parked for a cpl minutes went to start ..nothing just a very slow crank then not even that so

Sounds like engine may be partially seized, try turning engine by hand to see if it is too tight
1/26/2018 10:54:20 PM • 1999 Buick... • Answered on Jan 26, 2018
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Hi, I have a 1999 buick centuy that will not start. The engine does turn when I turn the key, but it just will not start.

You checked both large ignition 1 and ignition 2 fuses?
1/5/2018 8:51:43 PM • 1999 Buick... • Answered on Jan 05, 2018
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I changed my spark plugs on my 1999 Buick Century.

check for a vacuum leak.
12/18/2017 3:00:31 PM • 1999 Buick... • Answered on Dec 18, 2017
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Code P0481

Both radiator fan relay's ????? There are three relay's ! DTC P0481Cooling Fan Relay 2 Control Circuit Circuit Description Output Driver Modules (ODMs) are used by the PCM to turn on many of the current-driven devices that are needed to control various engine and Transaxle functions. Each ODM is capable of controlling up to 7 separate outputs by applying ground to the device which the PCM is commanding on. DTC P0481set indicates an improper voltage level has been detected, which controls the Cool Fan 2 and Cool Fan 3 Relays. Check cooling fan maxifuse 15 amp. This fuse supply's B+ voltage too cool fan relay's 2 & 3 control side . The PCM supply's a ground to energize these two relay's , the PCM is not seeing the correct voltage that it should be . The fuse could be the problem , an open circuit , the transistor or driver as GM calls it output driver module . The number 1 relay is working fine , with A/C on # 1 relay is turned on or energized by the PCM for low speed operation . There is a good video on youtube on how this three relay cooling fan system works an how to trouble shoot . Relay Driven Dual Cooling Fan Diagnostics
11/3/2017 10:16:27 PM • 1999 Buick... • Answered on Nov 03, 2017
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98 buick centry 3.1 6 cyc one owner family owned

Unfortunately, you've got serious problems. The GM 3.1 and 3.4 engines have a nasty habit of breaking camshafts. For some reason, which I have yet to determine, the cam bearings seize on the cam and the camshaft ends up breaking in half. The engine will continue to run, albeit very poorly since all the cylinders are not working because the rear half of the camshaft, which runs the oil pump, is not spinning.
10/28/2017 2:18:48 AM • 1999 Buick... • Answered on Oct 28, 2017
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I have a 1999 buick century 3.1 and the battery

With engine running what is voltage reading at the battery ?
Also a bad diode trio in the alternator will cause this problem if everything thing is charging ok
10/3/2017 4:56:42 AM • 1999 Buick... • Answered on Oct 03, 2017
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The blower fan cuts out intermitently regardless

From what you said I would think you have a bad/loose connection. I have never had to change the fan resistor but from what I under stand usually when the resistor is bad the fan only run with the fan speed on the highest setting. If the fan quits working try putting the fan on the highest speed setting, see if fan starts working. Sorry but that all I got for now.
9/10/2017 5:32:35 PM • 1999 Buick... • Answered on Sep 10, 2017
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Image of a 1996 century 3.1lit cylinder head

the inlet valve will be in line with the inlet port the exhaust will be on line with an exhaust port
9/10/2017 5:59:39 AM • 1999 Buick... • Answered on Sep 10, 2017
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Service enginge light on turns traction off

Most likely a bad wheel bearing, or wiring to the wheel bearing. I would start by having it scanned to point you in the right direction. (What bearing to look at). Could also be something in the ABS module.
8/15/2017 11:27:18 AM • 1999 Buick... • Answered on Aug 15, 2017
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96 buick lesabre climate control

Is the coolant full ? Any discoloring of the coolant ,look like muddy water ? gm dexcool antifreeze if mixed with regular green coolant can gum up the works , clog heater cores , radiators etc.... Have you ever had the thermostat changed , cooling system flushed ?
7/31/2017 12:26:48 PM • 1999 Buick... • Answered on Jul 31, 2017
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