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.