Chevrolet 30 Series 1967 Service Manual page 60

HEATER AND AIR CONDITIONING 1A-35
tension until it clears the rear bearing.
valve at the rear and withdraw the valve shaft from
the firewall.
Installation
1. Insert the tube shaft on the valve into the firewall
hole and lower the valve into position with the rear
pivot pin retracted. When the rear pin is aligned
with its bearing, allow it to extend into position.
2. Attach valve return spring and nylon bushing.
3. Assemble the connecting shaft to the valve and
actuating diaphragm.
4. Replace the cowl grille panel.
COMPRESSOR
Removal
1. Purge the refrigerant from the system.
2. Remove connector attaching bolt and connector. Seal
connector outlets.
3. Disconnect electrical lead to clutch actuating coil.
4. Loosen brace and pivot bolts and detach belt.
5. Remove the nuts and bolts attaching the compressor
brackets to the mounting bracket.
. Before beginning any compressor disassembly, drain
6
and measure oil in the compressor. Check for
Fig . 46 - W irin g Harness
Lift the evidence of contamination to determine if remainder
of system requires servicing. Compressor servic­
ing information is located in the Chassis Overhaul
Manual.
Installation
1. If oil previously drained from the compressor upon
removal shows no evidence of contamination, replace
a like amount of fresh refrigeration oil into the com­
pressor before reinstallation. It it was necessary
to service the entire system because of excessive
contamination in the oil removed, install a full
charge of fresh refrigeration oil in the compressor.
2. Position compressor on the mounting bracket and
install all nuts, bolts and lock washers.
3. Install the connector assembly to the compressor
rear head, using new "O" rings.
4. Connect the electrical lead to the coil and install
and adjust compressor belt.
5. Evacuate and charge the system.
. Leak test the system and check for proper operation.
6
Compressor Belt Tension Adjustment
Adjust the compressor belt to the specifications shown
in the Tune-Up chart in the Engine section of this manual.
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CHEVROLET TRUCK SERVICE M ANUAL