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How to check the hot and cold air damper. A non-working damper can lead to freezing of the damper in the cold period, air suction, etc. The main faults of the damper. To check, you need to open the filter cover and remove the filter element. Start the engine and check, the damper should block the supply of cold air and open the supply of warm air from the exhaust manifold. If the damper does not move, disconnect the vacuum tubes from the thermostat (valve) and connect them together. If the damper still does not close, then the vacuum chamber, diaphragm on the filter is faulty. If the damper closes the access of cold air, the thermostat in the mono-injection cover is faulty. When the engine is running, the position of the regulator damper is set by the thermostat. At an air temperature below 40 ° C - 35 ° C, the regulator should be open, and the supply of cold air closed. At an air temperature above 45 °C, the regulator should close and open the cold air intake. ???? Friends! Your support is very important! You can help with a ruble here https://www.donationalerts.com/r/andsk64 ????All the tricks and secrets of Volkswagen and Audi repair ???? https://vk.ru/vagguru ????Telegram, where all the answers to questions ????https://t.me/+fMNhVhSfxycwZWYy Zen channel https://zen.yandex.ru/severny Mail: [email protected] If the video helped you and you want to help develop the channel Sberbank card: 4276 1609 2679 5262 Andrey S. Subscribe! Like if the video was useful!