GMC 1976 ZEO 6083 Maintenance Manual page 88

2. Disconnect the wiring harness at the switch .
3. Remove the switch to case screws and remove
the switch carefully so as not to damage the capillary
tube .
NOTE:
Note capillary tube position across the
core so that the capillary may be reinstalled in
the same position .
4. Place the new switch in position, installing the
capillary in the core in the same manner as at switch
removal.
5 . Install the switch mounting screws, connect
the wiring harness and the battery ground cables .
DISCHARGE PRESSURE SWITCH
The discharge pressure switch is located in the
condenser to evaporator line (figure 18).
REPLACEMENT
1 . Disconnect the battery ground cables .
2. Purge the system of refrigerant .
3 . Disconnect the wiring harness at the switch .
4. Remove the switch from the refrigerant line .
5 . To install, reverse Steps 1-4 above.
NOTE :
Be sure to use new "O" rings, coated
with clean refrigeration oil, when installing the
switch .
6. Evacuate charge and check system operation.
FUSE
A 25 amp fuse, located in the junction block
protects the entire air conditioning system except for
the blower when operating at HI .
BLOWER MOTOR RELAY
The blower motor relay is located on the firewall
on the blower side of the blower-evaporator case
(figure 20).
REPLACEMENT
1 . Disconnect battery ground cables and the wir-
ing harness at the relay.
AIR CONDITIONING SYSTEM 1- 7 1
2. Remove the relay to case attaching screws and
remove the relay.
3. Place the new relay in position and drive the
mounting screws .
4. Connect the relay wiring harness and battery
ground cables .
CONTROL ASSEMBLY (FIGURES
23 and 24)
REPLACEMENT
1 . Disconnect the battery ground cables .
2. Remove instrument panel bezel.
NOTE :
For details on instrument panel bezel re-
moval refer to "Instrument Panel Bezel Re-
placement" contained in CHASSIS
ELECTRICAL (SECTION 12) of this manual .
3. Remove four screws holding control assembly
to instrument panel (figure 38).
4. Pull panel forward to gain access to rear of
control assembly .
CAUTION : Be careful not to kink the
bowden cable.
5. Disconnect the bowden cable, vacuum harness
and electrical harness at the control.
6. If a new unit is being installed, transfer all
Figure 38-Removing Control Assembly