GMC Sierra

The GMC Sierra is the latest series of full-size pickup trucks from the American car builder General Motors. The GMC Sierra is known for its luxurious interior, unique grille and four-wheel steering system.

3,909 Questions
Brakes and Tires
GMC Sierra

Will 10 wide rims fit with your 14.5 wide tires?

For off road that is the rock bottom minimum. 12 wide would be recommended if your truck is to see the highway. Wheels that are too narrow make the tire crown in the middle of the tread. This causes only the center of the tire to contact the pavement. Which causes tires to wear out down the center, making tire replacement even sooner. Not the mention, not be able to hold the truck in the road. Most people think, okay I'll just let the air pressure down in my tires so they will get a flatter footprint. Yes, maybe, but you'll have to drop them so low that the pressure that you arrive at won't be safe nor applicable for highway or street travel. If a tire shop mounts your 14.5"s on your 10 wide wheels, make sure they don't rip the beads. These tires must be compressed pretty far down when mounting the top bead. Make sure the shop is qualified or express to the manager if they rip a bead, they bought the tire. BEFORE MOUNTING! Good Luck!

GMC Sierra

The brake lights of a 1994 GMC Sierra do not work and the fuse keeps popping any suggestions on fixing it?

Remove bulbs and check sockets for short to ground

Check wiring for short

Auto Parts and Repairs
GMC Sierra
Saturn S-Series
Crankshaft Sensors

How do you replace a crank sensor?

remove the plug unscrew the bolts and put back the way you remove it .

Depending on what car you have, the crank angle sensor is normally located behind your harmonic balancer, or somewhere close to the crank. To remove the harmonic balancer you'll first need to remove the drive belt then remove the bolts holding on the harmonic balancer. It won't usually come off easily so it'll need some persuasion with a few light taps from a hammer, or in severe cases a bearing puller. Once the balancer is removed access to the crank angle sensor is very easy. All you need to do is interchange the busted sensor for a new one.

GMC Sierra

Code P300 on a 99 GMC Sierra?

multiple/random misfires

GMC Jimmy
GMC Sierra

Where is the oil filter on a 1998 GMC Sierra?

near the front differential

GMC Sierra

What rear differential is in a 2001 GMC Sierra 2500 HD 6.6 Duramax diesel truck?

Mine is 3.73 semi slip

Air Conditioning and Coolant
GMC Sierra
Heating Ventilating and Air Conditioning

Low air flow for GMC Sierra air conditioner?

There are many things that can cause this..........

1. The blower motor is weak.

2. The blower wheel is broken.

3. There is trash inside the recirculation door.

4. Dash controls are not working correctly.

5. Internal a/c - heating doors are loose, broken or bad..

6. You may have a bad blower resister..

Clutches and Flywheels
GMC Sierra

How do you bleed a hydraulic clutch system on a gmc sierra?

shhould be da same way u bleed your break system... bleed valve on clutch master cylinder...

Car Smells
GMC Sierra
Car Heaters

What causes a burning smell from a car heater?

Could be many things. Can't say exactly what. But, here are a few things I would check. Do you have trees in the area you park your car? If so, you could have leaves pine needle or other dibree in you heater vent that could have caught fire from your heater motor. I actually had this happen once, it filled my pickup cab with wood smoke. It smelled like that every time I used the heater until I sold the truck. You heater core could have a leak and the antifreeze smell could be coming through your vents. Or your heater motor itself could be going bad and melting the winding on the motor armiture. I'm sure there could be other things like electrical shorts, lost cigar behind the ashtray. Hope that gives some help.

Chevy Silverado
Chevy S-10
GMC Sierra
Ford Windstar LX

Where can you find a vacuum hose diagram for a 1982 Chevy pickup?

When it is working, go to and they have diagrams. Or go to MOTORLIT.COM. 4bbl A/T Calif Emissions

No, it does not. Please be accurate on your answers.

GMC Sierra

What makes the parking and dash lights not work on a 1990 GMC Sierra but turn and brake lights do?

They're on a different circuit. The parking and dash lights go through the headlight switch. It could be the switch, a bad wire/connector or a burned fuse.

GMC Sierra

Where is the thermostat located on a 1992 GMC Sierra 5.0L?

The thermostat is located under the thermostat housing which is connected to the engine side of the upper radiator hose, and bolts to the intake manifold with 2 bolts. To replace, drain and properly dispose of coolant, remove upper radiator hose, and remove thermostat housing. The thermostat sits in a recess between housing and manifold. Replace with correct thermostat with the correct side facing engine, new gasket and a little sealant.

Chevy Blazer
Chevy Tahoe
GMC Sierra
Pontiac Grand Am
How To

How to reset the passlock on 1998 Chevy 1500?

cut the yellow small wire from ign. switch in the column up by the switch. this is the passlock wire.

but will it start iwas told that it wouldnt

GMC Sierra

If the key will not turn in the ignition of your 1992 GMC Sierra 350cu how do you replace the switch?

Hey SC==You need to replace the lock cylinder not the switch. If it has air bags, there is a chance you can deploy it while working on it so you may want to leave it to a mechanic. You need to remove the air bag fuse first then take off the air bag then the lock plate and the turn signal switch. Then the key reminder contacts at the end of the lock cyl. There is a screw holding the lock cylinder in so removing it lets you pull it out of the steering column. You will need some special tools that can be rented at the parts store.GoodluckJoe.

You can buy a switch for about 15 dollars to replace it but you must remove the steering wheel and lock ring to do this and that takes a couple special tools to remove this.

This may be oversimplifying things, but before you go to the effort and expense of ripping your steering column apart, check to be sure that the key is not so worn out from use that it no longer works. Good Luck!

Check your Key , It may be worn out ,and will not engage the tumblers in the lock properly. Get a New Key cut and give that a Try First

Make sure you are using the correct key, on my GM truck both the door key and the ignition key fit in the ignition, only one works. If you have lock steering try turning the steering wheel to the right or to the left while trying to turn the key.

Spark Plugs and Wires
Timing and Firing Orders
Ford Ranger
GMC Sierra

What is the firing order for spark plug wires for a 1989 GM Sierra 1500 4.3 liter?

Distributor rotates clockwise.The firing order is 1-6-5-4-3-2

GMC Envoy
GMC Savana
GMC Sierra

How do you set the clock on a 2003 GMC Envoy?

Under the tune dial on the radio head unit, there should be 2 little round buttons. One is for the hour, and the other for the minutes. Hold each one in until you get the desired time set. That's all there is to it, assuming you have the Bose head unit.

Auto Parts and Repairs
GMC Sierra

How do you adjust headlights on a '94 GMC truck?

There is an adjustment screw located on top of the fixture and at the side, you will need a Phillips screw driver. park in front of your garage and turn on lights (best if done just b4 dark) and adjust.

Windshields and Wipers
GMC Sierra

What size wiper blades for a GMC Sierra 2500 4x4?

It will depend on the year of vehicle. See sources and related links below for more information. Since there are over 22 different wiper arm attachments, do not buy wipers just by length only. Be sure to lookup exact wiper blade part numbers by vehicle make, model and year for the brand wiper you decide to purchase. This ensures correct length AND correct attachment.

Car Fuses and Wiring
Chevy Blazer
GMC Sierra

How does a person gain access to the taillight wiring harness on a 1991 Chevy Blazer 4dr to wire in trailer lights?

most dont come with a wiring harness for trailer but if you look under the driver side of the truck under the bumper you will see a bundle of wires and there should be a paper located on the wires to match up a wiring harness. The ground is a large white wire and hook up other wires color to color. Most wiring harnesses are 4 wire but you should have enough for a 6 wire on the truck but only use 4. I just wired mine up last week!

Electric Windows
Windows and Mirrors
GMC Sierra

How do you fix a passenger window that won't go up on a 2000 GMC Sierra truck?

window regulators are junk in these vehicles - check for bad regulator cables regulators about 250-300 bucks and 1.0 to 1.5 hours of labor

Chevy Silverado
GMC Sierra
Safe Driving Techniques

What is towing capacity for a 2005 gmc 2500hd with duramax?

@ 13000 lbs from the hitch 16000 lbs from the 5th wheel.

GMC Sierra

How do you change front rotors on 1998 GM Sierra?

When I bought my '96 Sierra 1500 Z71 approx. 3yrs ago I replaced the front rotors and had the same problem. I think that I ended up breaking 3 snap-on impact sockets in the process. I sprayed everything down with a rust penetrating lubricant and let it sit and soak in for a while then resprayed it again. I think I used a HUGE impact on it and then resorted to a 3/4" rachet/socket with a monster break over bar on it. It took a while and a lot of strength, but eventually cracked. I suggest getting a good rust penetrating spray, like a BG product or something similar, and soaking all the nuts and bolts in that multiple times. Good Luck!!!

AnswerI am currently trying to change the same rotors for a 1997 Sierra. Having a 3/4 ton pickup with 4wd. Engine 5.7 with Allison trannie. The attempt I have made starts with removal of the caliper. then there are 3 bolts that mont the caliper frame to the hub. this hub also seems to extend through rotors and has a 5/16" plate that mounts to rotor . So far 3 sokets have broken and I do not try heating it. As is I had to heat the lug nuts off and wack the rim with a sledge as the metal rim bonded with rear drums and front rotor. I hope to complete this in a week , it is my plow truck and need it in better shape.
Oil and Oil Filters
Chevy Silverado
GMC Sierra

What is the engine oil capacity for a 2007 GMC Sierra 1500 V8 5.3 liter?

6 quarts of 5W-30

Chevy Silverado
Chevy Tahoe
GMC Sierra

Where is the knock sensor located on a 2002 Tahoe 5.3 literr?

It has 2 of them and there both underneith the intake manifold. You can't see are get to them until you remove the intake.

Starters and Ignition Systems
GMC Sierra
Ford Expedition Eddie Bauer
Ford Expedition XLT

How do you find the starter wire on an 85 GMC sierra 4x4?

A tiny 2-prong junction box on the firewall. one wire comes to it from the Ignition, & the other wire goes out from it to the starter. If you take a jumper wire from the positive on the battery & touch it to the post on the junction box where the starter wire comes out, with the key on, It should start the truck. If it doesn't, you need a new starter.


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