Compressor Clutch Relay: Description and Operation

The constant control relay module uses a combination of relays and solid state switches to control the following systems:
- Engine cooling fan
- A/C clutch
- Fuel pump
- Powertrain control module power

The powertrain control module can interrupt A/C compressor operation through the constant control relay module under the following conditions:
- During engine start-up
- Wide Open Throttle (WOT)
- Low engine idle conditions
- Excessively high engine temperatures