Opel Astra J 1.7 cdti - the air supply works randomly - once it turns on, once n

Hello, I have a problem with the supply / fan in Astra J. In summer it works without any problems and when the temperature drops / air humidity increases, the fan works randomly. With air supply in each gear from 1 to 6, the air supply is turned on once and not - regardless of whether the air conditioning is on or not. It is often the case that after a few kilometers, the airflow suddenly starts to work, even though it was set at the same level all the time. Can you tell us what the problem is / how to remove the fault?
I rummaged through the forum and someone wrote about a damaged fan resistor - but there was a case that one fan speed did not work - but here all work once / none works once. could this be the reason?

I would clean or possibly bend all the contacts involved in the fan power supply.
He checked the plugs.
Fuses from the fan. Maybe you only have one from the engine and sometimes it does not contact you when you pick it.
The engine was loud? Maybe it is blurring and having difficulty taking off?
When it turns on, maybe on bumps caused by shocks?
You probably just got SOMETHING out of touch and you have to find it.
You could check if there is voltage to the fan plug when it is not working.
You have some "maybe" before you take it to the electrician.

Thanks for the answer. can you tell in astra J how to get to this fan and where are these contacts, some driver?

Probably in the cabin above the passenger's legs.
https://astraklub.pl/viewtopic.php?t=823952 jumped out of the goggles after entering a piece of the title of the topic "Opel Astra J 1.7 cdti - air flow"
The contacts are in the cubes - plugs and sockets.
Wires come out of these plugs, they lead to other plugs and contacts, controllers, control panels.
How much you track yourself and see through yours, you do not have any permanent damage, only temporary and here even a stupid removal and insertion of the plug can help.
The only bigger problem is which one, and you have to undress something to get to these plugs ... I didn't undress ...
Of course, if you had a meter or an indicator, you could check the voltage, but we don't know what.