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Temperature blend door actuator is probably stuck on heat position , needs replacing more then likely. Videos on youtube showing how to replace it .
https://www.youtube.com/watch?v=4wPg6uJCNcs

Now as far as it shutting down , that could be any number of thing's , could cost a lot of time an money tracking that down . It would be best if when it shut off it wouldn't restart ,easier to fix that way .

2004 GMC Envoy | 34 views | 0 helpful votes


did you install a new radio,if so you need to re wire all the speakers,the amp is under the console assuming you had a bose,but same for other radio's. take a speaker and check from the radio to see if it works,if so re wire the speakers. good luck.

GMC Cars &... | 24 views | 0 helpful votes


Nothing you can do , have it towed to a qualified repair shop.

2002 GMC Envoy | 33 views | 0 helpful votes


they twist and pull out from the back

1996 GMC Sonoma | 23 views | 0 helpful votes


Spark plug gap should be .035"/0.9mm

GMC Cars &... | 27 views | 0 helpful votes


Hi there's this website something like reliable-store and it is very amazing for manual for repairing servicing anything
someone on fixya recomm ended it to me and I thank him even today
They have full manuals and it's verrrrry cheap and mine
I got free in offers

GMC Cars &... | 25 views | 0 helpful votes


Look like dealership job.they have to use diagnostic programmer to reprogram it.

GMC Yukon Denali... | 23 views | 1 helpful votes


The clutch in the torque converter could be slipping causing excessive heat. What is the transmission fluid temp?

GMC Yukon Cars &... | 42 views | 0 helpful votes


Check your e brake and then trany fluid.

2001 GMC Yukon | 27 views | 0 helpful votes


watch a few youtube vids about parasitic draw

GMC Cars &... | 53 views | 0 helpful votes


Rock back and forth might help. Drivetrain might be wound up in hard surface. Reverse in 2WD for 29-39 ft and try to shift to AWD.

GMC Cars &... | 31 views | 1 helpful votes


hello
u will find a lot of wiring diagrams and circuit diagrams help books and stuff like this at reliable-store
the girl in the chat box can help u instantly... im a frequent buyer there since Im a mechanic so take help from there

GMC Sierra Cars... | 60 views | 0 helpful votes


Voltage regulation is electronic, no way to adjust it. First, clean your battery terminals. Then do a battery test first. High charging voltage can be caused by high resistance at the terminals or inside the battery. A battery test will show whether the battery is good or not.

GMC Cars &... | 34 views | 1 helpful votes


The reason the light is flashing constantly is because the vehicle is sensing that four wheel drive(4WD) is not working. These 4WD systems use vacuum from the engine to engage/disengage to front axle. The vehicle probably has no vacuum going to the front axle, which would not allow the 4WD shift to complete, which would then leave the light on the dash flashing.
First thing to check is that the vacuum actuator on the firewall is working as it should.

vacuumactuator-i41lip55jj2iikcwyaqb5d1m-1-0.png

2000 GMC Jimmy | 32 views | 0 helpful votes


Are the heater hose's going to the firewall hot ? This vehicle does not have a heater control valve . The temperature door actuator is probably the cause . Your best bet , take it to a qualified repair shop .

GMC Cars &... | 29 views | 0 helpful votes


I got this free Pdf manual from reliable-store for free and I don't think Ive visited a mechanic or fixya for help for more than 3-4 times out of the 20 times I fixed the chipper in these 4 years

2004 GMC Envoy | 44 views | 0 helpful votes

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