SOURCE: How to replace the headlights on my 2003 GMC envoy.
The headlights on the envoy are the easiest parts of the car to repair. You just pull the two tabs at the top of the headlights, screw out the bulb containers and you are good to go
SOURCE: how do you change brakes on a 2003 gmc envoy
don't need any special tools, standard sockets sets, "C" clams is a must unless your a He-Man and wrench set, plyer or needle nose will do. I assumed being 2003 your rotor never have been turn and i recommend every time you change your bakes is good idea to have your rotor turn. reason is it will make your pad last lot longer, removed any vibration and better even wear on the pad and eliminate any squealing although is not necessary to do so. make sure you get extra break fluid to bleed the brakes. get your self 5 feet long smallest vacum rubber hoses and a glass jar to bleed your brake fluid in. the rubber vacum hose you going to use to fit on to the bleeding nipple and run the other end of line to your the glass jar to save the brake fluid when you bleed the brakes. when removing caliper, check inspect make sure the rubber seals around your piston look good and not crack or deteriorated. before applying new pad make sure you open the bleed valve to reduce the pressure by turning the bleed nipple counter clockwise and leave it open attach that rubber hoses to the nipple because you going to press on the piston back into it housing with the "C" clamp in order for new pad to fit. becareful not to damage the rubber seals around the piston. its going to take lots of effort to push that piston back in so be a bare with it if needs to. once the pad is back in make sure you keep the reservoir full with brake fluid and then bleed the brake. two people is a good idea to do brake. one will do the pumping the brake and holding it down and other will bleed the nipple. I bleed it 2-3 time will do the job. good luck!
SOURCE: i have a 2002 gmc envoy bringing up codes P0440
440 is Evaporative emission control system malfunction. Could be as simple as cleaning your gas cap & filler well & making sure gas cap is on tight, as that is the most common cause, otherwise you may need to check for vacuum leaks or purge solenoid has failed, or canister may be plugged.
495 is telling you that your engine/rad cooling fan, is malfunctioning as well, which I suspect is causing that noise your hearing. Have it looked at a.s.a.p. as it can do some real $$$ damage if it flies apart.
Have codes erased after fixing fan & making sure cap is tight, then see if 440 comes back, if it does, you may need to do more investigation.
SOURCE: where is coolant temp sensor located on 2003 gmc
heres a diagram to show you where the coolant temp sensor is located, its behind the alternator on the left side (driverside),the sensor just unplug the connector and then unscrew it and out it comes.
SOURCE: What is the most likely problem for codes POO14
this is set from camshaft and crankshaft sensor, always check engine oil for the right vescocity and change oil if necessary to avoid this dtc set
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