Chevrolet 70 1969 Series, Shop Manual

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C AB A N D BO DY M O U N T IN G S 1-69
auxiliary fan air stream to measure wet bulb
temperature.
6. Connect engine tachometer.
7. Open all air outlets below dash.
8. Locate a calibrated thermometer in center
outlet. Sensing bulb must not touch metal.
9. Place transmission lever in "Neutral,"with
parking brake on.
10. Start engine and set "A I R " lever at " O U T ­
S ID E ," " T E M P " lever full left for maximum cooling
and blower switch at high blower speed.
11. Set engine speed at 2000 rpm.
COM PRESSO R
I
p -----► TO C O N D EN SER
EVAPORATOR
G A U G E H IGH
PRESSURE HOSE
m l f e j
,
VALVE FROM RECEIVER DEHYDRATOR
LOW PRESSURE
V A C U U M PUMP
H IGH PRESSURE
TO SYSTEM
SUCTIO N LINE
GAUGE HOSE CONNECTIONS AT COMPRESSOR
TO VA CU U M
PUMP, REFRIGERANT,
OR REFRIGERANT OIL
GAUGE SET
TO SYSTEM
DISCHARGE LINE
Figure J 3 — Hook-Up of Gauges and Evacuating Pump
CHEVROLET SERIES 70-80 H EAVY DUTY TRUCK SH O P M A N U A L