INSUFFICIENT HEATING & COOLING (NEW TEMP. CONTROL CABLE)

VEHICLES AFFECTED: 1990 M/L VANS (NEW TEMPERATURE CONTROL CABLE)

An insufficient heating or cooling condition may be experienced on some 1990 M/L vans. This condition can occur if the temperature control door does not shut completely.

A new temperature control cable is utilized on the 1990 M/L vans. Adjustment is preset during assembly. Once preset, it cannot be readjusted, a new cable has to be installed. There is no turnbuckle for adjustment as on previous models.

If full hot or full cold cannot be obtained, the temperature control door should be checked for proper adjustment by moving the control lever briskly from the cold to hot positions. If the door is properly adjusted it will shut completely and a "slapping" sound will be heard at each end of the lever travel.

If a "slapping" sound of the temperature control door is not heard it is necessary to replace the temperature control cable and set properly during assembly.

REPLACEMENT INSTRUCTIONS: (Figures 1 and 2).

1. Remove the instrument panel lower extension.

2. Remove the engine cover and heater duct.

3. Remove the passenger side instrument panel trim panel.

4. Remove heater A/C duct.

5. Remove relay bracket, instrument mounting bracket and instrument panel metal plate located on RH side between heater and kick panel.

6. Disconnect and pull out the temperature control assembly from the dash.

7. Disconnect both ends of existing temperature control cable, pull through two clips and discard.

8. Install new cable through clips and connect connect both ends (to control assembly and temperature door lever).

9. Remove the shipping spacer on the cable assembly and discard.

10. Move the control lever to maximum cold. This adjusts the temperature control door properly.

11. Slide the mechanical lock on the cable assembly against the adjustable shell to maintain the correct temperature door position. Once the mechanical lock is in position, it cannot be moved.

12. Reverse procedure to reinstall removed parts, other than cable.

PARTS INFORMATION:

QUANTITY PART NUMBER DESCRIPTION -------- ----------- ----------- 1 15614083 Temperature Control Cable Assembly

1 11501937 Retainer

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.