K 1500 Truck 4WD V6-262 4.3L (1991)
Air Door Actuator / Motor: Customer Interest
A/C Control Head - Locks Up/Temp Door Actuator Clicks
Number:
91-468-1B
Section:
1B
Date:
DEC. 1991
Corporate Bulletin No.: 161102
ASE No.: A7
Subject:
HVAC CONTROL HEAD LOCKS UP/TEMP DOOR ACTUATOR CLICKS WITH AT FULL COLD
Model and Year:
1991 C/K TRUCKS WITH AIR CONDITIONING (RPO C60)
Owners of some 1991 C/K light duty trucks with the electronic pushbutton HVAC control head may experience a condition where the vent arrows on the
left of the display and the temperature arrows on the bottom of the display begin flashing and the control head "locks up" so that no changes in the
HVAC system can be made. This is caused when:
1.
The control head is placed in defrost and the temperature arrow is placed at a point between full hot and full cold.
2.
The "Heater" end of the selector button and the "Hot" end of the temperature scale button are pressed so that the mode actuator motor and the
temperature door actuator motor are operating simultaneously.
Other 1991 C/K trucks may exhibit a clicking noise from the temperature door actuator, which is in the blower motor area. This is caused when the
temperature is placed in full cold, and the temperature door actuator clicks for 45 seconds due to receiving pulses from the HVAC control head for the
same 45 seconds.
Important:
One truck will not experience both conditions.
To correct either of these conditions, replace the HVAC control head with a new HVAC control head (P/N 16152129 - LD.).
SERVICE PROCEDURE:
The procedure for replacement of the HVAC control head is found in section 1B "CONTROL ASSEMBLY REPLACEMENT" of the appropriate
Service Manual.
SERVICE PARTS INFORMATION
Part
Number
Description
Application
16152129
HVAC control head
1991 C/K 1, 2, 3
Parts are expected to be available on 1-13-92. In case of limited inventory, parts will be placed on 400 control to waive VIP surcharges. Only verifiable
emergency orders will be accepted. SPO will make every effort to obtain parts. However, the part will be shipped premium transportation at the dealer's
expense and all other order types will be placed on backorder until the 400 control is removed.
WARRANTY INFORMATION
Labor Operation:
D0362
Use applicable labor time guide for labor hours.
