Chevrolet 10 Series 1968, Service Manual

Page: 60 / 713

HEATER AND AIR CONDITIONING 1A-29
3. Remove the sheet metal nuts from the heater case
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.
8. Remove the heater case to firewall retaining screws.
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 dash 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.
3. Position the dash outlets distributor against the
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.
6. Install the glove box.
7. Install the sheet metal nuts to the heater case studs
which project forward through the firewall.
8. Attach the heater hoses to the core tubes and con­
nect battery ground strap.
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.
3. Remove core.
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.
3. Replace the heater case in the vehicle as outlined
under Heater Case.
BLOWER RESISTOR UNIT
Removal (Fig. 40)
1. Remove the screw attaching the floor outlet duct
(above the heater outlet) to the firewall.
2. Remove the screws attaching the distributor to the
heater case, slide the distributor downward out of
rear slide and let it rest on the floor panel.
3. Unplug the resistor unit connector.
4. Remove the resistor unit retaining screws. Remove
the unit.
Installation
1. Place the replacement unit in position and install
mounting screws.
2. Connect the resistor connector.
3. Position the dash outlet air distributor against the
heater case, insert the forward lip into the retaining
clip, and install the retaining screws.
4. Mount the floor outlet duct to the firewall with the
attaching screw.
MUFFLER AND CONNECTOR BLOCK
Removal (Fig. 42)
1. Purge the system.
2. Remove hoses at the compressor inlet and muffler
outlet pipes. Cap the connections.
3. Remove muffler outlet pipe clamp.
4. Remove bolt retaining connector block to compressor
and remove the connector and muffler assembly.
Cap the compressor ports if not immediately re ­
mounting muffler assembly.
Installation
1. Assemble the connector block to the compressor
using new " O ” ring seals.
2. Secure the muffler outlet pipe in the pipe clamp.
3. Connect the refrigerant hoses to the compressor in­
let and muffler outlet pipes.
4. Evacuate and recharge the system.
KICK PANEL AIR VALVE
Rem oval (Fig. 44)
1. Disconnect vacuum hose from actuator.
2. Disconnect valve return spring.
3. Remove actuator bracket mounting screws.
4. Remove link retainer at actuator and lift link up out
of actuator. Remove actuator assembly.
5. Remove actuator from bracket.
Installation
1. Attach actuator to bracket.
2. Install link in actuator and install retainer on link.
3. Mount the bracket to the kick panel.
CHEVROLET TRUCK SERVICE MANUAL