Compressor Clutch Relay: Description and Operation

Vehicles equipped with an engine mounted in the transverse position are also equipped with an electric engine cooling fan. An integrated relay control module (IRCM), incorporates circuit control provisions for various engine functions as well as for the engine cooling fan and the A/C compressor clutch coil. When the engine coolant temperature exceeds the predetermined maximum, the cooling fan is energized. If an A/C function is chosen, the compressor clutch coil will energize only when the engine cooling fan is operating.

Figure 11 provides a schematic of the circuit involved. It also illustrates and charts the pin-outs for the integral connector for the module.

Figure 11 - IRCM Circuit And Pin-Outs:

NOTE: The following conditions may cause the A/C compressor to momentarily disengage:

1. Wide-Open Throttle (WOT).
2. Very high, or too low engine speed.
3. Engine cranking.
4. High engine coolant temperature.

A low or no refrigerant condition will also prevent the A/C compressor from engaging.