Dodge Durango
 Service Manual
Heating and Air Conditioning » Description and operation
Electronic cycling clutch switch


The Electronic Cycling Clutch Switch (ECCS) is mounted to the outboard side of the thermal expansion valve in the engine compartment. A thermistor probe within a capillary tube on the switch is inserted into a well on the side of the expansion valve filled with a thermally-conductive grease. This arrangement allows the ECCS to monitor the temperature of the expanded refrigerant entering the evaporator.


The function of the ECCS is to prevent refrigerant temperatures from becoming so low that condensation freezes on the evaporator fins. This condition is referred to as evaporator icing. Evaporator icing reduces air conditioning system air flow and cooling performance.

The ECCS is connected in series electrically with the heater-A/C mode control switch, the low pressure cut-off switch and the high pressure cut-off switch between ground and the Powertrain Control Module (PCM). The ECCS will open when it monitors a refrigerant temperature below about 2.9 C (37.2 F), and will close again when the refrigerant temperature reaches about 4.3 C (39.7 F). The opening and closing of the ECCS signals the PCM to cycle the compressor clutch on and off through the compressor clutch relay.

The ECCS is a factory sealed and calibrated unit and cannot be adjusted or repaired. If faulty or damaged, the ECCS must be replaced.

    More about «Description and operation»:

    Blower motor

    Blower motor relay

    Blower motor resistor

    Blower motor switch


    Compressor clutch

    Compressor clutch relay


    Electronic cycling clutch switch

    Evaporator coil

    Expansion valve


    Heater and air conditioner

    Heater and air conditioner control

    Heater core

    High pressure cut-off switch

    High pressure relief valve

    Low pressure cut-off switch

    Rear overhead air conditioner


    Refrigerant lines

    Refrigerant line couplers

    Refrigerant oil

    Refrigerant system service ports

    Vacuum check valve

    Vacuum reservoir

    Dodge Durango Service Manual / Heating and Air Conditioning / Description and operation / Electronic cycling clutch switch

    Dodge Durango Service Manual


    © 2017-2023 Copyright