Crown Victoria V8-281 4.6L SFI (1998)
Compressor Clutch Relay: Description and Operation
RELAYS
The manual A/C-heater electrical system uses a relay and two pressure-sensitive switches to control system functions. These components are:
-
A/C clutch control relay.
-
A/C pressure cut-off switch.
-
A/C cycling switch.
A/C CLUTCH CONTROL RELAY
The A/C clutch control relay enables the A/C clutch when commanded by the Powertrain Control Module (PCM). The A/C clutch could be disabled
under the following conditions:
-
engine start-up
-
Wide Open Throttle (WOT)
-
during low engine idle conditions
-
excessively high engine temperatures
The A/C clutch control relay is a normally open relay connected in the A/C clutch circuit. When the relay is energized by the powertrain control module,
it enables A/C clutch operation.