Ranger 2WD V6-245 4.0L VIN X SFI (1997)
Compressor Clutch Relay: Description and Operation
A/C Time Delay and WOT Cutout Relay
The air conditioning system is monitored and regulated by the closed loop engine control system. This system, working through the Wide-Open
Throttle (WOT) relay disengages the A/C clutch under the following conditions:
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Immediately after start-up.
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For a brief interval during wide open throttle performance to allow extra engine power for passing.
^
When engine coolant temperature approaches an overheating condition.
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When engine idle rpm is approaching its stall speed.
In addition, the closed loop engine control system senses the output of the A/C cycling switch (and momentarily delays engaging the A/C clutch
until engine idle rpm is boosted to an acceptable rate. Briefly, closed loop engine control provides smooth engine performance at slower speeds, as
well as when the engine is operating in the idle range.
