Express 1/2 Ton Van V6-4.3L VIN W (1999)
Accumulator HVAC: Description and Operation
The sealed accumulator assembly connects to the evaporator outlet pipe. The sealed accumulator assembly functions as a liquid/vapor separator that
receives the following items from the evaporator:
^
The refrigerant vapor
^
Some liquid refrigerant
^
The refrigerant oil from the evaporator
The sealed accumulator assembly only allows the refrigerant vapor and the refrigerant oil to flow to the compressor.
At the bottom of the accumulator is a desiccant that acts as a drying agent for moisture that may enter the system. An oil bleed hole, located near the
bottom of the accumulator outlet pipe, provides an oil return path to the compressor.
A low-side pressure service fitting is located on the accumulator. A similar service fitting is provided for mounting the cycling pressure switch. DO NOT
discharge the system when replacing the switch. Service the accumulator only as a replacement assembly.
