Date registered: Mar 2005
Vehicle: '01-E320 & 02-ST2
Location: John 15:18-19
Mentioned: 0 Post(s)
Quoted: 35 Post(s)
Welcome to the forum, benzfam. Please take a minute to click the user cp link and complete your BW profile as that is often very useful information.
You'll probably get better results if you post in the forum specific to your model, the W163, and you'll find it down under the trucks/vans/suv heading. This general forum is just that, broad things of interest to all mb owners.
In this case it sounds like the duovalve is stuck or broken, I'd try cleaning it first. Same procedure as that for the W210, there is a pictorial DIY for it in the W210 section.
If you have basic skills you can do this yourself.
Take care and enjoy the ride,
Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)