C 2500 Truck 2WD V8-305 5.0L (1990)
Control Assembly: Customer Interest
HVAC Control Head - Inoperative, No Display
Number: 93-44-1A
Section: 1A
Date: NOV. 1992
Corporate Bulletin No.: 261210
ASE No.: A7
Subject:
HEATER VENTILATION AIR CONDITIONING (HVAC) CONTROL HEAD INOPERATIVE - NO DISPLAY
Model and Year:
1990-93 C/K TRUCKS
The HVAC control head on some 1990-93 model year C/K trucks may not illuminate when the vehicle is first started. This condition is much more likely
to occur after a battery disconnect or control head replacement but may occur after any ignition cycle.
The condition is not permanent, it stems from the control head not receiving a correct signal when the ignition is turned on.
Recycling the ignition switch may bring the control head back to normal operation. If cycling the ignition does not work, disconnect and reconnect the
baftery making sure that a good electrical connection is maintained when reconnecting (avoid "chattering" the battery line).
