Chevrolet 1980 Light Duty Truck Service Manual page 41

4. Remove the control through the opening above the
control.
5. If a new unit is being installed, transfer the blower
switch to the new unit.
6. To reinstall, reverse Steps 1-4 above.
G Models
Replacement (Fig. 1A-15)
1. Disconnect the battery ground cable.
2. Remove I.P. bezel as outlined in Section 8C of this
manual.
3. Remove the control to instrument panel mounting
screws (3) and carefully pull the control rearward far
enough to gain access to the bowden cable attachments.
Care should be taken to prevent kinking the bowden cables
while lowering the control.
4. Disconnect the bowden
illumination bulb, the blower switch connector and remove
the control from the vehicle.
5. Remove the blower switch screws and remove the
blower switch.
6. To install, reverse Steps 1-4 above.
CONTROL CABLES (Fig. 1 A -16 & 1A-17)
C-K Models
Replacement
1. Disconnect the battery ground cable.
2. Remove the instrument panel bezel.
3. Remove the control to instrument panel screws.
4. Raise or lower control as necessary to remove cable
push nuts and tab attaching screws.
5. Remove glove box and door as an assembly.
6. Remove cable push nut and tab attaching screw at
door end of cable.
7. Remove cable from retaining clip and remove cable
assembly.
8. To install, reverse Steps 1-7 above. Be careful not
to kink the cable during installation. Be sure to route the
cable as when removed. Check cable adjustment.
cables, the control
remove the switch assembly.
connector.
remove the resistor.
above.
G Models
1A-17)
Replacement (Fig.
Heater and defroster cable routing and attachment to
control and to distributor case is illustrated in Figure 1 A-17.
If cable adjustment is required, see below.
Adjustm ent - CK Series
1. Disconnect the battery ground cable.
Remove glove box and door as an assembly.
2.
3. Pry off the appropriate cable eyelet clip and
disconnect the cable from the door.
4. Remove the cable retaining screw.
5. While holding the cable with pliers, rotate the
mounting tab on the cable to lengthen or shorten the cable,
whichever is required.
NOTICE: Do not pinch the cable too tightly or
damage to the cable could result.
6. Install the cable, reversing Steps 1-4 above.
Adjustm ent - G Van
1. Attach inner cable and sheath to I.P. Control.
With I.P. installed, move temperature cable to cold
2.
and attach loop on inner cable to temperature door on
heater case.
3. Attach cable sheath to heater case.
4. Move temperature lever to full heat. This will
require some effort due to force required to slide inner cable
clip to its proper position.
BLOWER S W ITC H
C-K Models
4)
Replacement (Fig. 1 A-1
1. Disconnect the battery ground cable.
Remove the instrument panel bezel.
2.
3. Remove the control to instrument panel screws and
lower the control onto the radio.
4. Disconnect the switch electrical harness.
5. Remove the switch attaching screws and remove the
switch.
6. To install, reverse Steps 1-5 above.
G Models
1A-15)
Replacement (Fig.
1. Disconnect the battery ground cable.
Disconnect the blower switch wiring harness
2.
connector at the switch.
3. Remove the two switch attaching screws and
4. To install a new switch, reverse Steps 1-3 above.
RESISTOR
1A-5
Replacement (Figs.
1. Disconnect the wiring harness at the resistor
Remove the two resistor mounting screws and
2.
3. To install a new resistor, reverse Steps 1 and
HEATER 1A-13
1A-18)
and
LIG H T T R U CK SER V IC E M ANUAL
2