Question about 1991 GMC Sierra

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1991 Sie rra GMC AC control problem

When you select ac on the control panel the compressor clutch will not engage. The AC light on the panel comes on and flashes on and off for a short time and eventually goes completely off. You can push the AC button on the control and it will cycle through the sam process over and over again, but the ac still willnot operate.

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  • rickdanford Jun 29, 2009

    I already jumped out the low pressure switch and nothing changed.

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  • GMC Master
  • 426 Answers

This will happen if the system senses low charge. This doesnt mean that is the problem the low pressure switch or cycling switch on the accumulator/dryer on passenger side firewall will also keep in from coming on. this can be checked by jumping the system there.If you jump it and it comes on and air is cold on both sides of cab this could definately be the problem.

Posted on Jun 29, 2009

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3 Answers

1991 Sierra GMC AC control problem


The follwing is a cut and paste from a service bulletin:

Bulletin No.: 461202

Date: May, 1994

SUBJECT:
A/C CONTROL HEAD FLASHES OR ERRATIC OPERATION OF A/C CONTROLS (POLISH
TERMINALS)

MODELS:
1988-94 CHEVROLET AND GMC TRUCK C/K MODELS
1990-94 CHEVROLET AND GMC TRUCK TOPKICK/KODIAK MODELS WITH C60 OR C69 AIR
CONDITIONING

CONDITION:

A/C Control Head flashes, performs erratically or malfunctions.

CAUSE:

Light surface corrosion on the Control Head terminals.

CORRECTION:

Remove the A/C Control Head and while holding the unit with the terminal
cavity down (toward the floor) so no particles will fall inside on the
circuit boards, polish the terminals on both sides of the cavity with a lead
pencil pink eraser. Do not use an ink eraser or other abrasive such as a
small wire brush or sandpaper, etc. Doing so will remove the terminal
coating and degrade the contact surface.

Performing this procedure, in many cases, will make replacing the Control
Head unnecessary. Using this procedure in conjunction with the A/C circuit
diagnosis found in the Electrical Diagnosis Manual and especially before
replacing a Control Head for any reason is recommended.

After polishing the Control Head terminals, but before reconnecting, check
for proper terminal contact as described in the applicable electrical
diagnosis manual. If contact is good, apply dielectric grease (P/N 12345579)
to the harness connector terminals. Please do not apply grease to the
Control Head.

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1 Answer

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scott it sounds like you might have a small leak. most a/c units will not engage the compressor clutch if there is no refrigerant. I would goto autozone and use a leak detention kit before I would do anything. Normally when you fill it up then you will hear the clutch engage... let us know

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It may have a bad AC clutch, or a wire is split somewhere in the harness. check for appropriate voltage at the compressor.

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1 Answer

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