Toyota
Dodge Durango
 Service Manual
Heating and Air Conditioning » Description and operation
Evaporator coil

FRONT

DESCRIPTION

The evaporator coil is located in the heater-A/C housing, under the instrument panel. 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.

OPERATION

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 lowpressure gas when it leaves the evaporator.

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

REAR

DESCRIPTION

The rear evaporator coil is located in the rear overhead A/C unit housing, above the headliner. 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.

OPERATION

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.

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    Dodge Durango Service Manual / Heating and Air Conditioning / Description and operation / Evaporator coil

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