GMC 1976 ZEO 6083 Maintenance Manual page 61

1- 44 AIR CONDITIONING SYSTEM
THERMOSTATIC SWITCH
VACUUM ACTUATOR
A-3926
Figure 16-Evaporator Housing
THERMOSTATIC EXPANSION VALVE
The valve consists primarily of the power ele-
ment, body, actuating pins, seat and orifice. At the
high pressure liquid inlet, is a fine mesh screen which
prevents dirt, filings or other foreign matter from
entering the valve orifice .
The valve is located inside the evaporator hous-
ing (See figures 15 and 16).
When the valve is connected in the system, high
pressure liquid refrigerant enters the valve through
the screen from the receiver-dehydrator or con
denser and passes on to the seat and orifice. Upon
passing through the orifice the high pressure liquid
becomes 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 as such. The power element bulb is
clamped to the low pressure vapor line just beyond
the outlet of the evaporator (figure 17).
Components, Type 2
01
0
U\'\
la \~ :
y l
OUTLET
A-2240
Figure 17-Expansion Valve Cross-Section