Poa Valve - Chevrolet 10 1971 Series Chassis Service Manual

HEATER AND AIR CONDITIONING 1A-30
Fig. 37— Heater and Ducts
Replacement
1. Purge the system.
2. Disconnect the outlet hose at the condenser inlet pipe
and the compressor inlet hose at the POA valve. Cap
or tape the open connections at once.
"O" ring seals.
3. Remove the connector block to compressor bolt and
remove the muffler, hoses and connector block. Cap
or tape the open connections.
seals.
4. Assemble the new connector block to the compressor
using new "O" ring seals coated with clean refrigera­
tion oil.
lbs.
5. Attach the compressor inlet and outlet hoses at the
POA valve and condenser inlet pipes using new "O"
ring seals coated with clean refrigeration oil.
6. Evacuate, charge and check system operation.

POA VALVE

Removal
1. Disconnect battery ground cable and purge the system.
2. Remove evaporator oil bleed line and expansion valve
equalizer line. Cap the connections.
3. Remove retaining clamp screw and loosen POA valve
outlet pipe clamp mounting screw.
4. Remove POA valve inlet and outlet connections and
remove POA valve. Cap the open tubes.
5. Remove clamp from POA valve.
Installation
1. Assemble clamp on POA valve and connect inlet
and outlet connections using new "O" ring seals
coated with clean refrigeration oil.
2. Secure POA valve clamp and outlet line clamp.
3. Connect the evaporator oil bleed line and the ex-
Fig. 3 8 — A ir Outlets and Hoses
Discard the "O" ring
Tighten the connector block bolt to 20 ft.
10-30 CHEVROLET TRUCK SERVICE MANUAL
Discard the