2008 GMC Sierra 2500 HD Questions

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My voltmeter needle is no longer in the range of values on top(from 10 to 2 oclock) but registering now from 8 to 5 oclock. During heavy rain, water is coming in cab probably from the top running lights
change out the throddle switch
Interested in the R&R time for taking apart the dash to access a problem with the airflow system. The dealer seems to be on a wild goose chase. 4 visits and no results!! Now they're threatening it might not be cove...
there is a roar in the front end at highway speeds. the noise gets less with slower speeds and higher speeds.
My ac blows cold air just not much coming out of the vents. The fan sound slike it is blowing hard so I figure the coil is dirty (I farm for a living). I can't see how to get to the coil nor do I see filters like the ...
THIS TRUCK WHEN COOL OR COLD STUMBLES & HESITATES TO START FUEL PRESSURE 60 T0 66 PSI COLD & HOT. MASS AIR FLOW CORRECT ,TPS CORRECT, MAP CORRECT, REPLACED THROTTL BODY, HOOKED UP BATTERY CHARGER, SAME THING, DID A ...
Trying to find out the best way to clean fuel lines that have Gas instead of diesel fuel includng how to remove excess fuel in the fuel pump befre repriming?
I just can't get the Bumper from around the light I heard it had Black plugs I CAN'T FIND THEM
could I change the original size tires of my pick up for a 265 r 16. the actual size is 245 r 16.