Signal KOREL:

The engine control module signals the IHKA (Signal KOREL) when the idle increase has taken place and the IHKA will then activate the compressor clutch, as long as all other compressor requirements are satisfied. Compressor cut off conditions include:

• Evaporator temperature below 2°C
• Coolant temperature > 117°C - causes the compressor to run in a pulsed operation.
• Coolant temperature > 120°C - the compressor clutch is deactivated until the temperature drops below 117°C.
• Full acceleration at low speeds - below 10 MPH with a full throttle input will cause the compressor to shut off for 10 seconds.