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There was a problem, the windows fogged up, not always, but when it was very cold, I thought why, I replaced the radiator, it became warmer, it began to fog up more, I decided to remove the filter, and found that the air intake selector flap was not working! This was the whole problem of fogging up the windows, when air is taken from the passenger compartment, there is no ventilation of the passenger compartment as such in principle!