GVS L4-1116cc 1.1L SOHC VIN 2 2-bbl (1988)
Control Module HVAC: Technical Service Bulletins
Air Conditioning - Electronic Thermostat Control Unit
DISTRIBUTION: All Service Departments
AIR CONDITIONING/ ELECTRONIC THERMOSTAT CONTROL UNIT
Equipped with Yugo factory air conditioning system.
This system cycles the compressor to accomplish the cooling function. The compressor clutch receives power through the
clutch relay, which is controlled by the Electronic Thermostat Control Unit.
The Control Unit receives inputs from the ignition
switch, dashboard temperature control, evaporator blower switch, and the evaporator thermistor probe. The Unit processes
these inputs and cycles the compressor accordingly. Compressor clutch relay control current is the only output from the Unit.