I read this on a post here where advise was given about AC problems.

If the theromostat is failing the car would run hotter, and the AC switch would cut off the compressor, resulting in no AC.

This information was an older post in the search part of this forum.

Thanks for all information, I don't want to replace the fan clutch ,and spend around $300 if the thermostat could be a problem. $30 is a lot easier to spend than $300 when you are retired. I can fix almost anything, once I know the details.

The book manuals for MB are not there like Chiltons where exploded images really help. I bought the MB CD and it's good but it's not great.

Give me a technical book with pictures and I can repair it. I grew up with exploded diagrams views, it's had to find anything like that for Mercedes.