Control A S S E M B L; Blower Motor S W Itch; Blower Motor R E L A - Chevrolet 10 Series 1970 Service Manual

HEATER AND AIR CONDITIONING 1A-34
TEMPERATURE
O U TL E T
DEFROSTER
OUTLET SELECTOR
CABLE
F ig . 4 3 —A ir C o n d itio n in g C ontrols
3. Rem ove retaining clamp screw and loosen P O A valve
outlet pipe clamp mounting screw .
4. R em ove P O A valve in let and outlet connections and
rem ove P O A valve.
5. Rem ove clamp from P O A valve.
Installation
1. A ssem b le
and
coated with clean r e frig e ra tio n oil.
2. Secure P O A va lve clamp and outlet line clamp.
3. Connect the evaporator o il bleed line and the ex­
pansion va lve equalizing line to the P O A valve using
new "O " ring seals coated with clean re frig e ra tio n
oil.
4. Connect battery ground cable.
the system .
CONTROL ASSEMBLY
Removal (Fig. 4 3 )
1. Disconnect battery ground cable.
2. Rem ove the screw s in the low er lip of the dash which
attach the control assem bly bracket to the dash.
3. M ove the unit toward the front of the veh icle and
lo w e r it.
4. Disconnect the blow er harness connector and illu m i­
nating lamp sockets.
mounting
switch.
5. Rem ove the control cables and tra n sfer them to the
replacem ent control unit.
Installation
1. Attach the blow er switch to the unit.
harness connector and illum inating lam ps.
the mounting bracket.
hoses.
2. L ift the unit into position and attach it to the dash.
3. Connect the battery ground cable.
BLOWER M OTOR SWITCH (Fig. 4 4 )
Removal
1. Disconnect battery ground cable.
2. Disconnect
switch.
3. Rem ove blow er switch mounting screw s and rem ove
switch.
Installation
1. P la c e blow er switch in position and install mounting
screw s.
2. Connect w iring harness to switch.
3. Connect battery ground cable.
DEFROSTER
BLOWER M OTOR RELAY (Fig. 4 4 )
CABLE
Removal
1. Disconnect w iring harness at rela y connector.
2. Rem ove
relay.
Installation
1. P la c e rela y in position and d rive mounting screw s.
2. Connect w iring harness to relay.
Cap the open tubes.
clamp on P O A valve and connect inlet
outlet connections using new "O "
Rem ove the b low er switch and
bracket. Rem ove
Check them fo r adjustment.
Install the vacuum switch and
w iring harness
the rela y mounting
CHEVROLET TRUCK SERVICE MANUAL
ring seals
Evacuate and charge
the vacuum control
Connect the
Attach
connector at blow er
screw s and rem ove