Laser FWD L4-1997cc 2.0L DOHC Turbo (1993)
Compressor Clutch Relay: Description and Operation
A/C Circuit
PURPOSE
The Air Conditioning Relay supplies current to the A/C compressor clutch when the ECM determines that engine conditions are suitable for A/C
operation.
LOCATION
The A/C relay is located on the left fender apron.
OPERATION
When the driver turns on the A/C system, and the engine temperature is below 238° F, a positive voltage signal is supplied to the ECM (as an indication
that the A/C system is needed) and to one side of the A/C relay coil. The ECM determines if engine conditions are suitable for A/C operation (idle speed,
ignition timing and air/fuel mixture). If the ECM senses that conditions are suitable for A/C operation, it supplies the ground circuit for the A/C relay
coil, energizing it. This allows the relay to supply voltage to the compressor clutch.
