How to repair a heater in a Lada Largus

Prepare the car for work. Disconnect the negative terminal of the battery

Removal

Remove the instrument panel.

Drain the coolant.

For cars equipped with an air conditioning system, the refrigerant should be discharged from the air conditioning system in accordance with the operating instructions for the service equipment.

Using a 13 mm socket head, unscrew the two bolts 1, Figure 1, of the lower fastening of the reinforcement 2 of the instrument panel cross member to the body base.

Using a 13 mm head, unscrew the two nuts 1, Fig. 2, of the upper mount of the amplifier 2 of the instrument panel cross member. Disconnect the wiring harness block 3 and remove the amplifier 2.

Using a clamp puller, squeeze and move the two clamps 4, Figure 3.

Remove the heater inlet 2 and outlet 1 hoses from the heater radiator pipes 3.

Using a T20 Torx head, unscrew the two screws 2, Figure 4, fastening the air distribution unit 1 to the crossmember 3.

Using a T20 Torx head, unscrew screw 4, Figure 5, securing the left front air duct and remove the air duct, similarly remove the right air duct.

Using a 13 head, unscrew two screws 2 securing crossbar 1 on the right and left of the instrument panel, move the crossbar aside.

For vehicles equipped with an air conditioning system: from the engine compartment, using a 10 mm head, unscrew the two bolts 1, Figure 6, securing the pipelines to the evaporator, disconnect the connections and install technological plugs on the pipelines and the evaporator unit.

Disconnect the wiring harness blocks from the fan, additional resistor.

Remove the heater unit assembled with the heating, air conditioning and ventilation control unit.

Installation

Installation is carried out in the reverse order of removal, while:

- for vehicles equipped with an air conditioning system: remove the plugs from the pipelines and the evaporator unit, install new sealing rings on the pipelines.

Apply oil to the sealing rings compressor;

- perform vacuuming of the air conditioning system and load the system with refrigerant, according to the operating instructions for the service equipment.

Check the operability of the heating, air conditioning and ventilation system.

Disassembling the heater

Remove the heating, air conditioning and ventilation control unit by disconnecting the damper drive rods from the heater unit.

Remove the foam seals 2, Figure 7.

Using a T20 Torx head, unscrew the two screws 3 and remove the bracket for pipes 1.

Using a T20 Torx head, unscrew the screw 4 and remove the inlet pipes 7 and outlet pipes 8 of the heater radiator 6.

Using a T20 Torx head, unscrew the two screws 5, press the three clamps, remove the radiator 6 from the heater body and drain the remaining coolant (replaceable T20 Torx head, ratchet).

Unscrew the six screws 1, Figure 8, and separate the heater unit into two parts.

Remove evaporator 1, Figure 9, from the unit heater.

Assembly

Assemble the heater unit in the reverse order, while:

• - install new foam seals;
• - install new sealing rings on the heating system pipes.

Removing and installing ventilation and heating system elements

Removing the heater radiator

Drain the coolant in accordance with the requirements of TI 3100.25100.06005.

Remove the visor, instrument cluster and central floor tunnel trim.

Using a 13 mm socket, unscrew the two bolts 1, Fig. 10, fastening the reinforcement 2 of the instrument panel cross member to the body base.

Using a 13 mm head, unscrew the two nuts 1, Fig. 11, of the upper mount of the cross member reinforcement 2 through the window in the instrument panel, disconnect the wiring harness block 3 and remove the reinforcement 2.

Using a T20 Torx head, unscrew screw 3, Figure 12, and disconnect the inlet 2 and outlet 1 pipes from the heater radiator 4.

Using a T20 Torx head, unscrew two screws 6, press three retainers 5 and remove radiator 4 from the heater housing

Installation

Installing the heating radiator is carried out in the reverse order of removal, while:

- install new sealing rings on the heating system pipes.

Removing the additional resistor of the heater fan

The additional resistor of the heater fan is located on the heater housing on the side of the pedal block.

Remove the instrument panel (information on removal instrument panel).

Disconnect connector 1, figure 13, of the wiring harness, unscrew screw 2 securing resistor 3, remove the resistor from the heater unit (replaceable Torx T20 head, ratchet).

Installation

Install the removed parts in the reverse order of removal.

Removing the heater fan

Set the air distribution switch handle in the passenger compartment to this position. panel ь devices

Disconnect the wiring harness block 1, Figure 14.

Press the lock 2, turn fan 3 clockwise by a quarter of a turn and remove it from the heater housing.

Installation

Install the heater fan in the reverse order of removal.

Removing the heating, air conditioning and ventilation control unit

Remove the central instrument panel trim.

Unscrew the two screws 1, Fig. 15, securing the control unit 3 to the instrument panel, squeeze the clips 2 and remove the unit (replaceable Torx T20 head, ratchet).

Disconnect connector 4, Figure 16, of the instrument cluster wiring harness.

Disconnect the damper drive rods from the control unit

Install the heating, air conditioning and ventilation control unit in the reverse order

Replacing the cabin filter

The cabin air filter is located in the heater unit under the instrument panel on the glove compartment side.

Press retainer 3, figure 18, remove cabin filter 2, located in heater housing 1 from the side

Install a new cabin filter element.

Please note that most vehicle variants do not have a cabin filter! You can modify it and install a filter