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Check the thermostat of the air filter
The thermostat is mounted in the nozzle of the air filter and provides a switching line sucked in air (see photo). To test, remove the air duct, disconnect and start the engine. Watch the thermostat using a mirror. On the cold engine valve separating the thermostat should overlap the cold air duct (photo). As the engine warms up (10-15 minutes) the damper should open. The degree of opening is determined by the ambient temperature.
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