Chevrolet 10 Series 1968, Service Manual

Page: 38 / 713

HEATER AND AIR CONDITIONING 1A-7
inches away from the edge of the core (valve side),
and 2-1/2 inches back from the front edge of the core
(fig. 13). Before pinning the coil, bend the straight
section of tube in a gentle arc which will hold the
coiled end away from the core while unpinned. This
will prevent the tube from rattling against the core.
3. Mount the core to its retaining plate and mount the
core tube bracket.
4. Assemble the core retaining plate and core to the
core housing. “ Shoehorn” the plate under the lip of
the housing if necessary.
5. Attach the top cover of the core case.
6. Connect the temperature door cable and check its
adjustment. Secure the temperature cable access
plate.
7. Lift the heater assembly to the cowl panel and push
the mounting stud and core tubes into place.
8. Install the screws retaining the core case to cowl
at the air inlet. Install the lower left and right
core case bracket screws.
Install the air distributor mounting screw.
9. Connect the blower motor wire at the motor flange
terminal.
10. Replace defroster hoses.
11. Attach the air and defroster door cables and check
adjustment.
12. At the front of the cab, tighten the sheet metal nut
to the core case stud.
13. Connect the rubber elbows to the core tubes and
clamp securely.
14. Replace air intake grille.
15. Refill cooling system.
16. Connect battery ground cable.
AIR DISTRIBUTOR DUCT ASSEMBLY
All Models
Figure 14 (Deluxe A ir), Figure 15 (Chevy Van) and
Figure 11 (T ilt Cab) illustrate the air distributor duct
installation on the above vehicles.
DEFROSTER DUCT
All Models
The defroster hose and outlet assemblies for all ve­
hicles are illustrated in Figure 15.
CONTROL ASSEMBLY
Deluxe Air Heater
Rem oval (Fig. 16)
1. Remove the control assembly retaining screws at
the lower edge of the dash.
2. Lower the unit and remove the blower switch.
3. Remove the cables from the control unit one by one
and mount them in their respective positions on the
replacement unit. Check cable adjustment.
Installation
1. Attach the blower switch and wiring to the control
unit.
2. Place the unit in position in the dash and replace
mounting screws.
Fig . 13—T ilt C ab Thermostatic V a lv e C a p illa ry
C h e v y V a n
Removal (Fig. 17)
1. (Any control) Remove the knob from the control
shaft. Remove retaining nut and escutcheon, and
remove control from the steering column to dash
mounting plate.
2. (HEAT -FAN control) Disconnect the blower wiring
connector from the control.
3. (AIR or DEFROSTER control) Remove the cable from
the air distributor duct and actuating lever.
4. (TEMPERATURE control) Remove the glove box
assembly. Remove the cable end retainer from the
Fig . 14—Heater Distributor and Ducts (D elu xe A ir)
CHEVROLET TRUCK SERVICE MANUAL