Fresh/Recirculation Air Door Mode Button and Motor (V154), Checking

Fresh/Recirculation Air Door Mode Button and Motor (V154), Checking

Fresh/recirculating air button installed in Heater Control Module (J65)

Special tools, testers and auxiliary items required

• Voltage Tester (V.A.G 1527B)

• Recirculating air mode may result in windows fogging up (moisture in air increases in passenger compartment and then condenses on windows, there is no air dehumidification as for vehicles with A/C system).

• The function "recirculating air mode" is cancelled by switching off ignition. After switching ignition on again, Fresh/Recirculating Air Door Motor (V154) is activated by Heater control module (J65) and heater switches from recirculating air mode to fresh air mode (when recirculating air mode was selected beforehand).

• So that fogged windows are defogged as rapidly as possible, only restricted recirculating air mode is possible when rotary switch for air distribution - B - is located in "air to front windshield" - D -. The heater control module switches, for example, to fresh air mode after the rotary switch is turned into this position (and the LED in the button goes out).






• Make sure the fresh/recirculating air button - F - and the fresh/recirculating air door motor (V154) work correctly. Refer to => [ Fresh/Recirculation Air Door Mode Button and Motor (V154) Activation ] Fresh/Recirculation Air Door Mode Button and Motor (V154) Activation.

• Check the function of the fresh/recirculating air door motor, refer to => [ Fresh/Recirculation Air Door Motor (V154), Checking ] Fresh/Recirculation Air Door Motor (V154), Checking.

• Check the electronics in the heater control module and in the fresh/recirculated air door motor. Refer to => [ Heater Control Module (J65) and Fresh/Recirculation Air Door Motor (V154), Checking ] Heater Control Module (J65) and Fresh/Recirculation Air Door Motor (V154), Checking.