Condenser. Electronic cycling clutch switch



The condenser is located in the air flow in front of the engine cooling radiator. The condenser is a heat exchanger that allows the high-pressure refrigerant gas being discharged by the compressor to give up its heat to the air passing over the condenser fins.


When the refrigerant gas gives up its heat, it condenses.

When the refrigerant leaves the condenser, it has become a high-pressure liquid refrigerant. The volume of air flowing over the condenser fins is critical to the proper cooling performance of the air conditioning system. Therefore, it is important that there are no objects placed in front of the radiator grille openings in the front of the vehicle or foreign material on the condenser fins that might obstruct proper air flow. Also, any factory-installed air seals or shrouds must be properly reinstalled following radiator or condenser service.

The condenser cannot be repaired and, if faulty or damaged, it must be replaced.

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.

    Dodge Durango (DN) 1998-2003 Service Manual


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