Grand Caravan V6-3.3L VIN R (2005)
Evaporator Core: Description and Operation
Front
A/C Evaporator
The A/C evaporator for the front heating-A/C system is located within the front HVAC housing, behind the instrument panel. The front A/C evaporator
and insulator are positioned in the front HVAC housing so that all air entering the housing must pass over the evaporator fins before it is distributed
through the front heating-A/C system ducts and outlets. However, air passing over the evaporator fins will only be conditioned when the A/C compressor
is engaged and circulating refrigerant through the front A/C evaporator.
The front A/C evaporator tubes are connected and sealed to the A/C expansion valve by use of rubber O-rings and a tapping block.
The front A/C evaporator can only be serviced by removing and disassembling the front HVAC housing.
Refrigerant enters the front A/C evaporator from the front A/C expansion valve as a low-temperature, low-pressure mixture of liquid and gas. As air
flows over the fins of the front A/C 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 front A/C evaporator.
The front A/C evaporator cannot be repaired and, if faulty or damaged, it must be replaced.