Chevrolet 30 Series 1967 Service Manual page 35

F ig . 14 - Defroster Hoses
HEATER AND AIR CONDITIONING 1A-7
and pull the elbows off the core tubes.
Remove the sheet metal nut from the stud next to the
core tube elbows.
Disconnect the air and defroster door cables.
Remove defroster hoses from the distributor duct.
Unclip the blower motor wire from the motor flange
terminal.
Remove air distributor bracket mounting screw at
left of distributor.
lower left and right of core case.
Remove screws attaching core case air inlet to cowl
at top of core case (three screws at the top and one
at each side). Pull the heater assembly away from
the cowl panel.
10. Open the temperature cable access plate at the top
left of the core case and disconnect the cable (fig.
11
).
11. Remove the top cover of the core case.
12. Remove screws which attach the inner core retaining
plate to the core case (not the screws at the core
corners).
13. Remove the inner plate with core attached from the
core case (pry the plate at the retaining lip if neces­
sary).
14. Remove the core tube bracket and core retaining
screws.
15. Separate the core and plate.
16. Remove thermostatic valve capillary tube from the
core by withdrawing the plastic retaining pin.
17. Remove screws attaching thermostatic valve to core
and remove valve assembly.
Installation
1. Assemble thermostatic valve assembly to core.
2. Attach the thermostatic valve capillary tube to the
core with the plastic pin. Locate the pin 6-1/2
inches away from the edge of the core (valve side),
and - inches back from the front edge of the core
2 1 / 2
(fig. 12). 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.
. Connect the temperature door cable and check its
6
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.
. Install the screws retaining the core case to cowl
8
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.
Remove mounting screws at
CHEVROLET TRUCK SERVICE M ANUAL