Checking the technical condition of the ventilation and heating system (Granta 2190)

1. Prepare the car for work ("Preparing the car for maintenance and repair").

2. Start the engine.

3. Turn the air temperature control knob counterclockwise to the extreme position (blue sector).

4. Using the heater fan control knob, alternately turn on the four speeds of the electric fan. Based on the intensity of the air flow from the nozzles, we check the operation of the electric fan and the change in the rotation speed of its impeller when changing modes (1 is the minimum speed, and 4 is the maximum). If the electric fan does not work in all modes, we check the additional resistor ("Additional resistor - checking and replacement") and a switch. If the electric fan does not work, then check the electric fan power circuit ("Checking the technical condition of electrical equipment").
5. Turn on the maximum speed of the electric fan.

6. By turning the control knobs of the heater flaps and ventilation grilles, we monitor the change in the direction of the air flows. If the flow distribution does not change, the damper drive is most likely faulty.

7. After warming up the engine to operating temperature, turn the air temperature control knob clockwise to the extreme position (red sector).

8. Make sure that the air coming out of the panel nozzles has become warm. If the air temperature has not changed, the central flap drive may be faulty.

9. Turn the temperature control knob to the blue sector - cold air should flow into the cabin. If the temperature does not decrease, then the central damper drive is faulty.