Town & Country Van V6-201 3.3L VIN R SMFI (1990)
Compressor Clutch Relay: Description and Operation
Relay Locations
This relay is controlled by the Single Board Engine Controller (SBEC) and the A/C switch (inside vehicle). Voltage is supplied to the compressor clutch
via the A/C clutch relay; if the engine controller has applied the ground (ENERGIZED) to the A/C clutch relay. The A/C clutch relay is ENERGIZED
when the engine is RUNNING and the A/C control switch and blower switch are in the ON position, and the engine controller applies the ground to the
relay circuit.
If the SBEC senses a wide open throttle or low idle speed condition, via the throttle position sensor, it will remove the ground to the A/C clutch relay,
DE-ENERGIZING the relay, which will prevent A/C clutch engagement.
The A/C clutch relay also controls the radiator fan relay. When the air conditioning (A/C) is selected the relay supplies power to the compressor clutch
as well as the radiator fan relay, allowing the radiator cooling fan to operate when the A/C has been selected.
