Condenser. Electronic cycling clutch switch
DESCRIPTION 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. OPERATION 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. DESCRIPTION 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. OPERATION 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.Condenser
Electronic cycling clutch switch
Dodge Durango (DN) 1998-2003 Service Manual
- Lubrication and Maintenance
- Suspension
- Differential and Driveline
- Brakes
- Cooling System
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- Body
- Heating and Air Conditioning
- Emission Control Systems
- Introduction
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