Durango 2WD V8-5.2L VIN Y (1999)
Evaporator Core: Description and Operation
SYSTEM DESCRIPTION
Front
The evaporator coil is positioned in the heater-A/C housing so that all air that enters the housing must pass over the fins of the evaporator before it
is distributed through the system ducts and outlets. However, air passing over the evaporator coil fins will only be conditioned when the
compressor is engaged and circulating refrigerant through the evaporator coil tubes.
Refrigerant enters the evaporator from the expansion valve as a low-temperature, low-pressure mixture of liquid and gas. As air flows over the fins
of the evaporator, the humidity in the air condenses on the fins, and the heat from the air is absorbed by the refrigerant. Heat absorption causes the
refrigerant to boil and vaporize. The refrigerant becomes a low- pressure gas when it leaves the evaporator.
The evaporator coil cannot be repaired and, if faulty or damaged, it must be replaced.
Rear
The evaporator coil is positioned in the overhead A/C unit housing so that all air that enters the housing must pass over the fins of the evaporator
before it is distributed through the system outlets. However, air passing over the evaporator coil fins will only be conditioned when the compressor
is engaged and circulating refrigerant through the evaporator coil tubes.
Refrigerant enters the evaporator from the rear expansion valve as a low-temperature, low-pressure mixture of liquid and gas. As air flows over the
fins of the evaporator, the humidity in the air condenses on the fins, and the heat from the air is absorbed by the refrigerant. Heat absorption causes
the refrigerant to boil and vaporize. The refrigerant becomes a low-pressure gas when it leaves the evaporator.
The rear evaporator coil cannot be repaired and, if faulty or damaged, the rear evaporator coil must be replaced.