20 Most Recent 2001 GMC Yukon - Page 2 Questions & Answers

Here is the layout. Fuse descriptions will be in the owners manual.

If its in limp mode you should be able to pull codes for a direction to start looking

Check your tranny fluid level.

If the head rest is down and hasn't been moved in quite a while the guides may be corroded or rusty from moisture. A flat bar or large screwdriver with any sharp edges filed down or taped to avoid upholstery damage may be inserted between the seat back and headrest and rocked up and down like a seesaw near each end of the headrest to get it to move. If it starts to move you can add spacers to keep squeezing the headrest up until it moves more freely. If the headrest is part way up it may be cocked one way and jamming. just give it a whack or two side to side to see if it helps to free it. If you do get it out wipe a little silicone lube on the shafts with a rag to help keep it moving.

I believe water circulates always through the heater core (not on all vehicles, but on yours I think) and flapper doors open or shut to direct air through heater core and to defrost or vents. These doors have actuators which run on engine vacuum collected in a vacuum resevoir and held by a check valve. A vacuum leak, or bad check valve or bad actuator can cause no heat.

You need to know what code has priority. What that means is that one code can effect the other code.

18436572

Anti-lock braking system, I think,.. God Bless \God is not dead!!/ A. B. S

FUSE PANEL LOCATION The fuse box is located under dashboard on driver's side. Underhood fuse panel is located in engine compartment beside battery. Also, check this link for more information

You will have to go to the motor relay and check it for power. If the relay is not receiving power, it will not function.

To check the rear expansion valve, see if the a/c lines are different temperatures. One line to the rear evaporator should be hot and the other cold if it is working. Try to recailbrate the blend door actuator. Remove the HVAC module fuse. Wait at least 15 seconds. Replace it, turn the key on and wait 40 seconds

Sounds like a valve lifter or in queens english a hydraulic tappet ,Now what i used to do on the rover V8 was to add a tin of gunk brand name exterior engine cleaner and then let customer have the car back and do some miles,or as soon as the noise stopped ,then change the oil and filter and add the diesel/petrol turbo engine oil as this is detergent and then change the oil every 5/6000 miles with a oil filter every third oil change ,if no engine cleaner then try half a litre of diesel or just change the oil for one detergent type diesel engine oil you will not hurt the engine using this oil the cheaper it is the better as well .In extreme cases i give a 2 second squirt of fairy washing up liquid to the oil as well ,has to be fairy mind them cheapos are no good for this job .Stop worring about it and just do as i say

fuel supple issue-as shown be replacing fuel filter and seeing an improvement-next thing to try- put a new fuel pump in- Denny