V A C U U M Tank; Blower Resistor U N It; Blower M Otor R E La Y; Fuse - Chevrolet 1981 Light Duty Truck Service Manual

IB-42 AIR CONDITIONING
DEFROSTER BLUE
C O N TR O L
Replacement
1. Disconnect the vacuum lines at the tank.
2. Remove the tan k to dash panel screws and remove the
tank.
3. To install, reverse Steps 1 and 2 above.
BLOWER MOTOR RESISTOR
The blower m otor resistor is located in the blower side
of the blow er-evaporator case (Fig. IB-35).
Replacement
1. Disconnect the wiring harness at the resistor.
2. Rem ove th e resistor to case a tta c h in g screw s and
remove the resistor.
3. P lace th e new resistor in position and install the
attaching screws.
4. C onnect the resistor wiring harness.
BLOWER MOTOR RELAY - ALL
The blower m otor relay is located on the blower side of
the blow er-evaporator case (Fig. 35).
Replacement
1. Disconnect th e wiring harness at the relay.
2. Remove the relay to case attach in g screws and remove
the relay.
3. Place the new relay in position and drive the m ounting
screws.
4. Connect the relay w iring harness.
L IG H T T R U C K SE RV IC E M A N U A L
GR A Y-TO
PLENUM VALVE

V A C U U M TANK

HEATER ASSEMBLY
N O COLOR STRIPE
V IE W
Fig. 1 B-34--Vacuum Line Routing - C-K Models

FUSE

the entire air conditioning system except for the blower
circuit, the fuse for the blower circuit is located in the
electrical wiring between the junction block and the blower
relay.
C60 System. Since replacem ent of C60 System components
has been covered previously, only those components peculiar
to the O verhead System will be covered in this section.

REAR DUCT

the rear of the vehicle, and incorporates four adjustable air
outlets (Fig. IB-36).
Replacement
1. Disconnect the battery ground cable.
2. Disconnect the drain tube from the rear duct.
3. Remove the screws securing the duct to the roof panel
4. Remove the duct.
5. To install, reverse Steps 1 thru 4 above.
O R A N G E
C A M
LEVER
RECIRC. AIR
A 25 am p fuse, located in the junction block protects
OVERHEAD SYSTEM--C-K
MODELS
The O verhead System is used in conjunction with the
This duct covers the blow er-evaporator assembly, at
and rear header brackets.
CABLE
V IE W
A CTUA TO R
ACTUA TO R
V IE W