Heating and ventilation system
1 - air distribution box, 2 - heater radiator, 3 - air supply housing, 4 - fan
Heater radiator
1 - housing of the ventilation system, 2 - heater radiator, 3 - fastening screws, 4 - branch pipes
Two types of heating systems are used. On basic models, the heating system is manually controlled. On more expensive models, the heating system is controlled electronically. Both systems are identical except for the control unit.
The control unit is located in the panel and uses flap valves to control and distribute the air supplied to the passenger compartment through various parts of the system.
Cold air enters through a grill at the rear of the engine compartment. The air from the passenger compartment is removed through ducts at the rear of the vehicle. The incoming air is heated by a heated coolant.
The recirculation switch closes the fresh air supply while the air inside the vehicle is constantly circulated.
Attention! To repair the heating and ventilation system, remove the steering wheel, the instrument panel together with the casing, the front walls of the intermediate console, the lining of the window sill, the instrument cluster and the casing of the steering column.
Heater control unit (models up to 1992)
Removing
1. Disconnect the negative cable from the battery.
2. Remove radio.
3. Lower the steering column to the lowest position.
4. Remove the seat belt buckle control switch.
5. Unscrew the lower screw securing the decorative casing of the instrument cluster.
6. Remove ashtray.
7. unscrew five screws (indicated by arrows) center console mountings.
8. Pull the console forward and remove the connectors from the clock, cigarette lighter and switches.
9. unscrew four screws (indicated by arrows) fixing the control unit and remove the electrical connectors and control cable.
Installation
Sequence of installation of heater control cables
Heater vent flap control cable routing directions
1 - wrong direction
2 - right direction
Installation is made in sequence, return to removal. In this case, the control cables must be installed in a certain order.
Heater control unit (models since 1993)
Removing
1. Disconnect the negative cable from the battery.
2. Remove the central console.
3. Remove the ashtray and unscrew the two screws located on the bottom of the ashtray cover.
4. Remove radio.
5. Unscrew the two screws from the top of the radio pocket and remove the pocket.
6. Using a lever, remove the locking plate from the upper corner of the central ventilation nozzle and unscrew the screw.
7. Unscrew the four screws located under the heater control panel.
8. Using a lever, remove the switches from the bottom of the central ventilation nozzle and unscrew the exposed screw.
9. Pull the cover forward and remove the connectors.
10. unscrew two (indicated by an arrow) screws located on top of the heater control box and remove the box.
11. Release clamps (indicated by an arrow) fastening the cable to the heater control unit.
12. Remove control cables and connector from unit.
Installation
Installation is made in sequence, return to removal.
Heater fan
Removing
1. Unhook and remove the casing located under the instrument panel on the right side.
2. Remove the electrical wires attached to the fan housing.
3. Disconnect electrical connectors.
4. Remove fan motor.
5. Remove engine from casing.
6. Unscrew the screws securing the housing to the body.
7. Remove fan from below. The fan is attached to the chassis with fasteners behind the fan and screws around the perimeter.
8. Remove the wire contact from the control unit, unscrew the two screws and separate the unit from the casing.
Installation
To install the fan, follow the steps in reverse order with respect to the removal process, insert new fasteners on the housing at the bottom of the instrument panel.
Heater
Removing
1. Inside the engine compartment, install two clamps on the pipes of the heating system and disconnect them near the front bulkhead.
2. Drain the coolant from the radiator of the heating system.
3. Disconnect ground wire from battery.
4. Remove instrument panel.
5. In the engine compartment, remove the fan air intake deflector.
6. To access the heater mounting bolts, unscrew the screws (1) fixing the plastic ventilation shield and screws (2) wiper mounts.
7. In the window sill, unscrew the three screws securing the heating system.
8. Inside the passenger compartment, unscrew the screw of the holder for the heating pipes.
9. unscrew the screws (indicated by arrows) connecting the radiator to the heater.
10. Remove heater core.
11. Remove the pipes that direct air to the rear of the cabin (in the figure - O-rings on the branch pipes).
12. Unscrew the screw of the heating system holder on the console.
13. Remove the heating unit.
Installation
To install the heating system, follow the steps in reverse order with respect to the removal process. Remember to install new seals, add coolant to the cooling system (to the required level) and removing air from the system.