Explorer Sport Trac 4WD V6-245 4.0L SOHC VIN K SFI (2001)
Compressor Clutch Relay: Description and Operation
WIDE OPEN THROTTLE A/C CUT-OFF
The Wide Open Throttle A/C Cut-Off Relay (may be referred to as the A/C clutch relay) is normally open. There is no direct electrical connection
between the A/C switch or EATC Module and the A/C clutch. The PCM will receive a signal indicating that A/C is requested (for some applications,
this message is sent through the BUS + and BUS - circuits). When A/C is requested, the PCM will check other A/C related inputs that are available
(such as ACP (SW), A/C Cycling Switch (ACCS)). If these inputs indicate A/C operation is OK, and the engine conditions are OK (such as coolant
temperature, engine rpm, throttle position), the PCM will ground the Wide Open Throttle A/C (WAC) output, closing the relay contacts and sending
voltage to the A/C clutch.
