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Old 01-20-2008, 03:06 PM   #3 (permalink)
Merzatt
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Date registered: Nov 2007
Vehicle: '02 ML320
Location: Indianapolis
Posts: 175
Fluctuating cold and extremely hot air seems like malfunctioning air mixture flap (air mix damper door). It sits on top of the A/C system (behind the radio) and regulates the temperature of the airflow. Do a search and you will find the instructions.

Last edited by Merzatt : 01-30-2008 at 07:55 PM.
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