A/C - No LOW or LOW and MEDIUM Blower Speed
88chevy24GMC NUMBER: 88-T-98
GROUP: 1A - Heating and Ventilation
DATE: March, 1988
CORPORATE
NUMBER: 861103
SUBJECT: NO LOW OR LOW AND MEDIUM A/C-HEATER BLOWER SPEED
MODELS: 1988 C/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 15551633.
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.