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A summary of the video clip: Several of the problems listed can occur at the same time, of course. 1. Checking the antifreeze level is done with the engine cold and without the car being started. If the antifreeze level is low, the air in the system will make it impossible to fill the passenger compartment radiator, thus a low temperature will appear. Low antifreeze level is a symptom, not a cause. It is necessary to identify the cause of the low antifreeze level. 2. The thermostat stuck open can be due to the part that is old, but it can also be due to limescale and rust deposits. Therefore, changing the thermostat full of rust and limescale without cleaning the cooling system will not be a long-term solution. 3. Blockage or clogging of the passenger compartment radiator will occur due to limescale and rust deposits that have appeared in the engine. With a partially clogged radiator, temperature differences will appear from one vent to another. Regardless of whether it is cleaned or replaced, if the cooling system is not cleaned, the problem will reoccur over time. I have not yet tested a correct cleaning method. I will come back with details when/if I find it. 4. Defective motors or broken levers will make it impossible to move the flaps that regulate between the cold and hot air, thus the warm air will not reach the ventilation opening. With the engine off and the ignition on, listen to see if when you press the buttons/actuators, you can hear a motor running or other strange sounds. If nothing is heard, the motor may be defective. 5. Defective fan: • Why doesn't the passenger compartment fan work... various causes. 6. Defective climate control panel, where it no longer starts or no longer gives the command to the motors. Here you should consult the car manual and see if there are any fuses, and check whether or not they are blown.