RAM 1500 Truck 4WD V8-5.9L VIN Z (2002)
Evaporator Core: Description and Operation
A/C EVAPORATOR
The A/C evaporator is located in the HVAC housing, under the instrument panel. The evaporator coil is positioned in the HVAC 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 fixed orifice tube as a low-temperature, low-pressure liquid. 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.
