Chevrolet 30 Series 1967 Service Manual page 56

HEATER AND AIR CONDITIONING 1A-28
. Remove vacuum hoses to vacuum reservoir and
6
plenum air valve actuator.
7. Disconnect temperature door cable.
. (10-30 Series) In order to gain access to the lower
8
outboard case attachments, the right front fender
skirt should be loosened and moved. Remove enough
skirt mounting screws and bolts (from the rear
forward) to move the skirt a sufficient amount.
9. Remove the case retaining screws and sheet metal
nuts. Pull the case away from the mounting studs
and inboard to remove it.
Installation
1. Check the position of the blower and evaporator case
to firewall seals then position the case over the studs
projecting through the firewall and attach the screws
and nuts to retain the case.
motor ground strap.
and firewall at the screw next to the temperature
door lever.
2. (10-30 Series) Remount the right front fender skirt,
skirt.
3. Connect temperature door cable and vacuum hoses
(hose to engine vacuum source attaches to vacuum
tank connection nearest the engine).
4. Connect the refrigerant hoses to the expansion valve
inlet and the P.O.A. outlet using new "O" ring seals.
5. Connect the heater hoses to the core tubes.
. Connect the blower motor wire to the motor flange
6
terminal, and connect the battery ground cable.
7. Refill the cooling system, and evacuate and charge
the refrigeration system.
HEATER CASE
Removal
1. Drain the radiator.
2. Remove the heater hoses from the core tubes.
F ig . 38 - Heater and Ducts
Connect the blower
Replace spacer between case
Remove the sheet metal nuts from the heater case
3.
studs which project through the firewall to the engine
side.
4. Remove the glove box.
5. Unplug the relay connector.
6. Remove the right ball outlet hose.
7. Remove the screw attaching the dash outlets air
distributor to the heater case and move distributor
away from case.
. Remove the heater case to firewall retaining screws.
8
9. Pull the heater case away from the firewall and
reach in and disconnect the resistor connector.
10. Remove the resistor harness grommet and remove
the harness from the case. Withdraw the heater
case.
Installation
1. Place the heater case under the cash and insert the
resistor harness and install the grommet and connect
the resistor connector.
2. Position the heater case against the firewall and
push it into place. Check that nothing is pinched
between the case and firewall. Install the heater
case to firewall retaining screws.
Position the dash outlets distributor against the
3.
heater case, insert the forward lip into the retaining
clip, and install the retaining Screw.
4. Install the right dash outlet hose.
5. Connect the relay connector.
. Install the glove box.
6
7. Install the sheet metal nuts to the heater case studs
which project forward through the firewall.
. Attach the heater hoses to the core tubes.
8
9. Refill the engine cooling system and test system
operation.
Heater Core
Removal
1. Remove the heater case as outlined under Heater
Case.
2. Remove the screws retaining the core mounting
straps.
Remove core.
3.
Installation
1. Install the core into the case and seal it with non­
hardening sealer.
2. Mount the core with the core straps and retaining
screws.
Replace the heater case in the vehicle as outlined
3.
under Heater Case.
BLOWER RESISTOR UNIT
Removal
1. Remove the screw attaching the floor outlet duct
(above the heater outlet) to the firewall.
2. Disconnect the dash outlet air hoses from the dis­
tributor.
Remove the screws
3.
attaching the dash outlet distributor to the floor
outlet adapter.
4. Remove the screw attaching the distributor to the
heater case, slide the distributor rearward and
remove it.
5. Unplug the resistor unit connector.
. Remove the resistor unit retaining screws.
6
the unit.
(top, bottom, and seat side)
Remove
CHEVROLET TRUCK SERVICE MANUAL