1999 Buick Century - Answered Questions & Fixed issues

I have been in the business for 35 years and have never seen a "brake line diagram". You easiest way to figure out which one goes to the right front would be to start at the right front caliper and follow it to the hydraulic control module.

the fuse box is under the dash on the drivers side

check rear itself--u-joints --proper install of struts /bearings

Near the oil filter .

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.

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.

HI. The cap will be 4 1/2 Quarts. That will include the filter as well.

there is a light sensor locate up in defrost area of dash cover that controls the on and off of head lights

Your high beam switch is bad most likely.

Sounds like engine may be partially seized, try turning engine by hand to see if it is too tight

Check the electrical circuit Starter Voltage Drop

You checked both large ignition 1 and ignition 2 fuses?

check for a vacuum leak.

e:$32.75 new switch https://www.am-autoparts.com/Buick/Century/turn-signal-switches-and-levers/AM-13244281/321502.html?utm_source=bing&utm_medium=cpc&utm_campaign=Shopping%20Campaign%20-%20Main%20-%20Medium%20Priority&utm_term=1100000069466&utm_content=all%20published%20products plus there is always used at auto salvage yard

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

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

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.

the inlet valve will be in line with the inlet port the exhaust will be on line with an exhaust port

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.

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 ?