Execution sequence
1. We prepare the car for work (see «Preparing the car for maintenance and repair»).
2. We start the engine.
3. Turn the temperature regulator of the control unit all the way counterclockwise (blue sector) and, if installed, turn off the air conditioner (see «Astra air conditioning control unit - check and replacement» or «Zafira climate control unit - check and replace»).
4. Turn on the four speeds of the electric fan in turn with the knob for switching the rotation speed of the electric fan (see «Astra air conditioning control unit - check and replacement» or «Zafira climate control unit - check and replace»). By the intensity of the air flow from the nozzles, we check the operation of the electric fan and the change in the speed of its rotation. If the electric fan does not work at least at one of the speeds, it is necessary to find out the reason (see «Air conditioning fan - check and replace»). If all fan speeds are running but airflow is low, the filter is clogged (see «Astra air conditioner filter - replacement» or «Zafira air conditioner filter - replacement»), radiators of heating or air conditioning systems.
5. Turn on the maximum speed of the electric fan. Turning the rightmost knob for selecting the air distribution modes (see «Astra air conditioning control unit - check and replacement» or «Zafira climate control unit - check and replacement»), we track the change in the direction of the air flow. If there is no change in flow distribution, then the control unit or damper control rod is most likely faulty (see «Astra air conditioning control unit - check and replacement» or «Zafira climate control unit - check and replace»).
6. We warm up the engine to operating temperature, make sure that both inlet and outlet hoses of the air conditioner heater radiator are heated and have approximately the same temperature.
If this is not the case, the cause may be an air lock in the cooling system or a clogged heater core.
7. Turn the temperature control knob all the way clockwise - the red sector (see «Astra air conditioning control unit - check and replacement» or «Zafira climate control unit - check and replace»).
8. We are convinced that the temperature of the air leaving the nozzles of the instrument panel begins to rise. If the temperature does not rise, then the control unit or the damper control rod is faulty (see «Astra air conditioning control unit - check and replacement» or «Zafira climate control unit - check and replace»).
9. We make sure that there is no rapid fogging of the windows and the appearance of high humidity in the cabin, indicating a leak in the heater radiator and talking about the need to replace it.
Comment. A clogged filter can also lead to increased fogging of the glasses (see «Astra air conditioner filter - replacement» or «Zafira air conditioner filter - replacement») and a malfunction of the electric recirculation damper. To replace and check the recirculation electric drive, it is more advisable to contact a specialized service, since you will need to remove the instrument panel.
10. On cars equipped with air conditioning, turn on air conditioning (see «Astra air conditioning control unit - check and replacement» or «Zafira climate control unit - check and replace»). We are convinced that the temperature of the air leaving the nozzles of the instrument panel begins to decrease. If the temperature does not drop, it means that the air conditioning system is faulty, for diagnostics and repair of the air conditioning system it is more expedient to contact a specialized workshop.
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