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GMC Sierra 1500 Questions

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i think there is a faulty switch in the dash that switches from heater to vent to ac. i dont know where that is .
Then it'll go in reverse but now it's not going into drive unloi do the same thing, any ideas on what is happening with it?
The rear end is making a loud bang that garage now says it's the difference is this possible and why would they have not recognized this while installing the new transmission not happy at all could someone please help me thankyou so much regards cat
Sometimes when I start my truck and put it into gear it won't move like it is in neutral. When it does this i noticed that the service 4x4 warning is on and the push button 4 wheel drive selector on the left side of the dash displays the red neutral light. After I shut it off and try again it will start working. I have been having problems with this push button switch in the past but I don't know if it is the switch or something else. Thanks
195000 miles on it.
the fuel pump continue to release gas into the motor, over flooding the spark plug with gas and the piston chambers with gas when the truck is turn of within a certain amount of time. ( for instance when sitting over night or a day without restarting the truck. email me at leespike38@gmail.com.
Got the truck started for about 15 secs after banging on the fuel tank and filter, idled at 1500 then stalled again, would not restart after that
Air only blows out of defrost vents (not dash vents). Air currently only blows hot regardless of temp setting or if a/c is on.

Passenger window will not roll down.



Code reader also does not work. Is there a possible fuse problem as well?
TO AVOID HAVING TO DEAL WITH THE 4X4 KICKING IN AND OUT
Will run on either.gas gauge reads empty with full tank.fuel pump won't run. No signal to fuel injectors. Ran fine turned off 5 min later no run. Gas gauge was working, now not. New fuel pump done, no luck. Fuel pump will run if jumped, but still no run. Repeat will run on either, but quits when either runs out. Very confused.
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