A coolant leak may develop from the water pump. This can result in an engine overheating condition. A leaking water pump will require replacement.
Resources for the Repair and Maintenance of your 1991 GMC Rally Wagon 2500
1991 GMC Rally Wagon 2500
1991 GMC Rally Wagon 2500 Problems
The distributor may develop internal faults. This can cause a rough running engine or stalling condition, the Check Engine Light may or may not illuminate. Our technicians tell us that the distributor should be overhauled or replaced to correct this concern.
An engine vacuum leak may develop from the throttle body gasket causing a higher than normal idle speed. Failed gaskets should be replaced.
The alternator may fail causing the battery to go dead. The charge light on the dash may or may not illuminate. The alternator may also develop an abnormal noise. A failed alternator will require replacement.
An oil leak may develop from the distributor o-ring seal requiring replacement of the seal.
1991 GMC Rally Wagon 2500 Questions and Answers
the vents in the front will blow warm air for a couple seconds then it get cool.while the rear vents blow heat all the time