NO LOW/MEDIUM A/C-HEATER BLOWER SPEEDS (REPAIR INFO)

MODELS: 1988C/K MODELS WITH A/C (RPO C60)

A loose evaporator screen or loose wire in the screen may contact and short the low and medium speed resistor in the A/C-heater module on some subject vehicles. This could result in a lack of low or medium blower motor speeds.

To repair this condition:

1. Disconnect negative battery cable.

2. Remove glove box from dash.

3. Remove the two screws securing bracket bar to heater module and set bracket bar aside.

4. Remove resistor (See Service Manual X-8731, Page 1B.27 for illustration of resistor) located on top of heater module.

5. Check for loose evaporator screen wire which may contact resistor; remove if present.

6. Glue or epoxy the loose screen to the top of the evaporator core. Hold the screen against the core and liberally apply DAP Contact Cement, or equivalent, along top of screen or press RTV through screen to top of core.

7. Replace resistor, Part Number l5551633.

8. Reinstall bracket bar and glove box and reconnect negative battery cable.

For repairs to vehicles under warranty use: Labor Op.: D1002 Time: .5 hrs.

Screens have been secured to the evaporator coil by means of a plastic prong retainer in production starting with the following VIN breakpoints:

Assembly Plant VIN Breakpoints -------------- ---------------- Pontiac JE515486

Fort Wayne JZ519401

Oshawa J1529931

We believe these sources and their equipment to be reliable. There may be additional manufacturers of such equipment. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or equipment from these firms or for any such items which may be available from other sources.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.