2009 GMC Sierra 1500 new add

the factory service manual covers that
or here
https://eautorepair.net/Marketing/Default.asp

buy it your self, to do service serious we must READ the FSM.

Have you check the light bulbs

As per the attached pictures in GMC Sierra 2009 I can't find any access to the AC filter!
Doesn't have one?

You need to have someone with a GM factory tech2 scanner go into the computer an change tire size .

Sorry iam a europeon mechanic with no knowledge of this model but if i knew if it was hydraulic or a manual clutch then this would give me a better idea but if no play then its over adjusted causing the clutch to ride a bit hence the noise but how the adjuster works i have no idea here

how to replace low beam headlight bulb

Hi, this is a hydraulic clutch system.If the clutch is slipping, it is more than likely a worn clutch.If you had a hydraulic issue, the truck would be hard to shift, and the pedal would let out really low.It seems like you may be looking at a clutch replacement.Thanks...

Scan for any transmission codes If none are present, change the filter.

There was a TSB on this issue with your Sierra, a faulty or dirty ABS sensor is the cause of this problem. The fix is simple, just clean the ABS sensor at the front hub with brake parts cleaner and inspect the wire leads. At worst you may have to replace the sensor it self. Good luck

garage mans company.
broken plugs.