Express 1/2 Ton Van V8-305 5.0L VIN M SFI (1998)
Expansion Valve: Description and Operation
The rear air conditioning system uses a Thermo Expansion Valve (TXV). The valve consists of the capillary tube, body, actuating pins, seat and orifice.
At the high pressure liquid inlet, a fine mesh screen prevents dirt, filings or other foreign material from entering the valve orifice.
When the valve is connected in the system, high pressure liquid refrigerant enters the valve through the screen from the condenser and passes on to the
seat and orifice where it changes into a low pressure liquid.
The low pressure liquid leaves the valve and flows into the evaporator core where it absorbs heat from the evaporator core and changes to a low pressure
vapor and leaves the evaporator core. The capillary tube is clamped to the low pressure vapor line just below the outlet of the evaporator. The capillary
tube is held in contact with the rear evaporator outlet tube by a metal clip placed near the end of the tube.
