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Q: Air conditioner on 1998 Mercedes-Benz ML320

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When I turn on the air conditioner switch. A clicking sound come from the vents and extremly hot air blows from the vents. This occurs when the A/C is on. What could be the problem.
(6) Answers
(2) Comments
You have a faulty air blend door actuator. Google "detane" and "ML320" and you'll find a good video on how to replace it. It helps to have small hands to repair it this way. Otherwise you have to remove the entire dashboard.
Your Automatic Climate Control is malfunctioning and needs to be scanned with a good MB capable scanner at a good MB independent shop. The Hot Air is usually a fail safe mode when the Auto Climate Control acts up. It is so people don't freeze in winter, but it is very uncomfortable in Summer.
Since mine is a '98 during summer I use a copper tube and bypass the heater core. Also I cover core inlets.This allows the a/c to cool and not share heat from the core. I also ture the temp setting to silence the ticking.
I am having the same problem. Did you ever figure out what was causing the clicking noise. Mine still works great/blows cold just makes that noise if the switch is on high or in the blue/really cold a/c setting.
I had the same problem. The climate control switch had to be replaced and a few other things. It ran me around $1,700 for parts and labor at a local dealership, not what I intended to pay.