Blower M Otor Relay; Anti-Dieseling Relay; Compressor Clutch Switch; Blower Resistor Unit - Chevrolet 10 1971 Series Chassis Service Manual

HEATER AND AIR CONDITIONING 1A-32
BLO W ER SW ITCH
BLOWER M OTOR RELAY (Fig. 41)
Removal
1. Disconnect wiring harness at relay connector.
2. Remove the relay mounting screws and remove
relay.
Installation
1. Place relay in position and drive mounting screws.
2. Connect wiring harness to relay.

ANTI-DIESELING RELAY

This relay is mounted to the instrument panel, just to
the right of the air conditioning control. Its purpose is
to actuate the compressor clutch when the ignition switch
is turned off. This relay does not override the ambient
switch; therefore, when the temperature at the ambient
switch is below 37°F, the relay will not energize the
compressor.
Replacement (Fig. 41)
1. Disconnect the electrical connector at the relay.
2. Remove the relay to instrument panel attaching
screw and remove the relay.
3. Place the new relay in position (tang in bole in
instrument panel) and install the mounting screw.
4. Connect the wiring harness.
A N TI-D IESELIN G
RELAY
Fig. 41— W iring and Vacuum Harness-Underdash
COMPRESSOR CLUTCH SWITCH (Fig. 44)
Removal
1. Disconnect wiring harness at compressor clutch
2. Remove two mounting screws and remove switch.
Installation
1. Place switch in position and drive the two mounting
2. Connect wiring harness to switch.

BLOWER RESISTOR UNIT

Removal (Fig. 42)
1. Remove the screw attaching the floor outlet duct
2. Remove the screws attaching the distributor to the
3. Unplug the resistor unit connector.
4. Remove the resistor unit retaining screws. Remove
Installation
1. Place the replacement unit in position and install
2. Connect the resistor connector.
3. Position the dash outlet air distributor against the
4. Mount the floor outlet duct to the firewall with the
TO RELAY
RELAY
C O M PRESSO R
CLUTCH SWITCH
VIEW A
switch.
screws.
(above the heater outlet) to the firewall.
heater case, slide the distributor downward out of
rear slide and let it rest on the floor panel.
the unit.
mounting screws.
heater case, insert the forward lip into the retaining
clip, and install the retaining screws.
attaching screw.
10-30 CHEVROLET TRUCK SERVICE MANUAL