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1991 GMC K2500 Questions & Answers
1991 chevy heater isn't warm enough what would cause it
May have air lock (bubble) in cooling system. My 91 Sierra did that. Tried everything. Finally installed flush kit between engine and heater core, removed cap poured coolant into flush inlet until fluid ran back to radiator. Heater now will run me out of the truck cab.
91 gmc idles rough and engine surges when driving
It maybe the fuel pressure rugulator inside the EFI Unit. Sorenson makes a rebuild kit with all the gaskets, screens and regulator for about $30. An EFI is the most simplest carb you can rebuild. Check the Hanes manual or U-Tube to see how.
Back up light switch
The switch is called the PRNDLE and it is located on the lh side of the transmission. There is a known defect with the switches. The connector at the switch melts causing it to become inoperative.
Back-up light switch
It's screwed in to the transmission case,2 wire plug in,easy to change (this is for a manual trans)
Engine runs poorly when full throttle
run fault codes to check which sensor is giving the problem. Have a pressure test done on the fuel manifold to check for filter/pump and pressure regulator problems
Ac clutch not kicking on
ADD Freon. It's a R134 system and the pressure is too low. Trust me add Freon and it will work fine. With a low amount of Freon if you jump the low pressure switch at the accumulator it will be very cold but will not have enough pressure to kick on the low pressure switch.
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