Models without air conditioning
Heater/Ventilation Control Panel
1. Disconnect the ground cable from the battery (refer to Chapter Engine electrical equipment).
2. Remove the cigarette lighter as described in Chapter On-board electrical equipment.
3. Unscrew the control unit and remove it from the dashboard.
4. Disconnect the wiring connectors, then separate the cable housing brackets from the unit and separate the cables from their levers. Note that the control cables have color markings. If necessary, disconnect the control unit from the instrument panel.
5. Install in reverse order. Make sure the cables are securely attached to their original locations. The air temperature control cable has a red mark, and the air distributor cable has a blue mark. Check the operation of the control panel before installing the cigarette lighter.
Heater control cables
1. Remove the control unit as described in the paragraphs above. Access to the cable fasteners on the right side of the air distributor housing can be obtained both from under the instrument panel and through the opening under the control unit. Unscrew the bolt and remove the cover located under the instrument panel on the right (refer to the accompanying illustration).
2. Mark the control cables and their mounting brackets on the air distributor housing to avoid confusion of the cables during installation.
3. Unhook the retaining clips, then separate the cables from the air distributor housing and levers and remove them from the panel. Note that the cables are color-coded (refer to the accompanying illustration).
4. When installing, bring the cables into working position, using the color markings as a guide (red at the temperature control cable and blue at the air distribution cable).
5. Attach the cables to the air distributor housing arms and attach the cable housings. Using the marks made before removal, attach both cables with the mounting brackets. Install the control unit and check the operation of the cables.
Heater blower motor
1. Disconnect the ground cable from the battery.
2. Move the right door seal section and remove the plastic inner sill trim.
3. Release the blower motor wiring harness located under the dash at glove box level, moving from the center of the vehicle toward the door.
4. Remove the foam pad from under the supercharger, then disconnect the electrical connector.
5. Remove the three bolts and remove the blower motor assembly.
6. Turn the block 90° counterclockwise and remove it.
7. Perform installation in reverse order.
Heater blower motor control unit
1. The control unit is located behind the panel on the left side.
2. Disconnect the ground cable from the battery.
3. Disconnect the wiring, then unscrew the lower mounting bolt of the control unit.
4. Loosen the top mounting bolt, tilt the unit back and remove it.
5. Perform installation in reverse order.
Air distributor casing
1. Drain the cooling system. Alternatively, clamp the heater core hoses as close to the engine compartment bulkhead as possible.
2. Remove the instrument panel assembly as described in Chapter Body.
3. Loosen the clamps and remove the cooling system hoses from the heater heat exchanger pipes (refer to illustration).
4. Remove the seal from the top edge of the engine compartment bulkhead.
5. Loosen the mounting screws and remove the air vent deflector panel located near the windshield (on the right).
6. Loosen and remove the air distributor housing bolt (refer to the accompanying illustration).
7. Working in the engine compartment, unscrew the nut of the upper bracket on the bulkhead and the two bolts at the base of the block (refer to the accompanying illustration).
8. Loosen the bolts of the two fluid-carrying tubes located on the side wall of the housing and separate the tube assembly from the heater core and housing. Plug the ends of the tubes and the heater core connections to prevent coolant from spilling into the cabin. Place a rag around the housing as a precaution and wipe off any spilled coolant immediately with a damp cloth to prevent staining.
9. Make sure you have cleared the wires and cables away from the housing and have separated all attached components from it.
10. Carefully separate the lower duct and housing assembly from the bulkhead and remove it from the vehicle. Be careful not to spill any coolant.
11. Install in reverse order. Use new seals when attaching the tubes to the heater heat exchanger. Finally, top up the coolant level in the cooling system.
Heat exchanger heater
Note: On models with a two-piece casing, it is sufficient to remove only the right half of the casing.
1. Disconnect the ground cable from the battery (refer to Chapter Engine electrical equipment).
2. Drain the cooling system. Alternatively, clamp the heater core hoses as close to the engine compartment bulkhead as possible.
3. Loosen the clamps and remove the cooling system hoses from the heater heat exchanger pipes.
4. Drain as much liquid as possible from the heat exchanger by forcing air through its upper branch. Be prepared for liquid to come out of the lower branch and, if possible, divert the stream away from the engine.
5. Loosen the bolt and remove the cover located below the instrument panel on the left.
6. Unscrew the bolt securing the liquid-carrying tubes, located on the side wall of the casing, and the three bolts securing the heater heat exchanger to the air distributor casing.
7. Separate the tubes from the heat exchanger, being careful not to spill coolant in the cabin. Place a rag around the housing as a precaution and immediately wipe off any spilled coolant with a damp cloth to prevent staining.
8. Remove the heater heat exchanger from the casing, being careful not to damage its plates.
9. Install in reverse order. Use new tube seals.
Models with air conditioning
1. On models equipped with air conditioning, the car owner can only remove/install the panel and heater control cables, as well as the blower motor control unit. These actions are similar to those described above (refer to SectionRemoval and installation of heater components (all models except Scenic)).
2. Removal of the supercharger motor, air distributor housing, heater heat exchanger and air recirculation flap motor should be entrusted to a Renault service station, as these actions involve disconnecting the refrigerant-carrying pipes.
Caution: Do not disconnect any air conditioning system components until the air conditioning system is discharged.