Question about 2007 Mercedes-Benz ML320 CDI

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1998 mercedes ml 320 clicking sound near the a/c thermostat

Control knob

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There is a stepping motor in the dash, deep inside, that controls the vents for the a/c system. When it breaks, as it will, it goes on and on and makes a clicking sound. You may observe that your vents don't work like they used to. I broke down and had the dealer fix it, as I don't want to tear into the dash. It was pretty expensive, but they fixed it. I would try an independent MB service shop.

Posted on Aug 27, 2009

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Posted on Jan 02, 2017

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REMOVAL & INSTALLATION
1990-97 Passat Models
Install the cable ends marked with a white or blue band to the control head assembly. The cables must be attached to the control head before connection to the system air flaps.
  1. Remove the climate control head from the center dash assembly to access the control head cable ends.
  2. Remove the lower dash panels as necessary to access the cable lever arms.
  3. Attach the airflow distribution cable (cable 2) to the airflow distribution knob's lower control lever.

This cable can be identified as follows:
Operates the mode/central air flap Cable has a black sleeve and is 25.0 inches (634 mm) long Cable is marked with a white band
  1. Press the cable's sleeve against the control head stop and install the retaining clip.
  2. Attach the temperature control/air blend cable (cable 3) to the air temperature knob's control lever.

This cable can be identified as follows:

Operates the temperature control/air blend cable air flap Cable has a blue sleeve and is 21.0 inches (535 mm) long Cable is marked with a white band
  1. Press the cable's sleeve against the control head stop and install the retaining clip.
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This cable can be identified as follows:


Operates the footwell/defroster air flap Cable has a black sleeve and is 37.5 inches (954 mm) long Cable is marked with a blue band
  1. Install the cable such that the blue band is over the retaining clip mount and install the retaining clip directly over the blue band.
  2. Install the climate control head.
  3. Set the air flow distribution knob to defrost.
  4. Connect the longest airflow cable (cable 1) to the footwell/defroster flap lever on the heater's air box.
  5. Press and hold the flap's lever toward the retaining clamp perch and install the cable retaining clip.
  6. Set the airflow distribution knob to the Vent position.
  7. Connect the short airflow cable (cable 2) to the central/mode flap's lever.
  8. Pull and hold the mode flap's lever away from the retaining clamp perch and install the cable retaining clip. Check the operation of both air flaps making sure they can be heard contacting their stops.
  9. Set the temperature control knob to full cold.
  10. Connect the blue-sleeved cable (cable 3) to the air blend/temperature flap's lever.
  11. Pull and hold the mode flap's lever away from the retaining clamp perch and install the cable retaining clip. Check the operation of the air blend/temperature flap making sure it can be heard contacting the stops.

11_24_2011_10_52_22_pm.gif

Fig. Side view of the control head and cable location. 1. Footwell/defrost flap cable-2. Air distribution cable-3. Temperature control flap cable

11_24_2011_10_53_58_pm.gif

Fig. Temperature flap cable location and adjustment

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How can I replace the a/c fan knob Pontiac Montana


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