Mas Control Unit
 

Now that I figured out my mass control unit is bad on my 1991 190 E 2.6, thanks to David Poole's assistance, can anybody recommend an internet site where I can find one at a decent price? The cheapest I have found is $250.00 with a $170.00 core charge. Is that reasonable?

I have one for $120.00,used but works great.It was tested on a friends car for a month but he decided to live without A/C for the winter. This one cost me $120.00 plus about 10.00 shipping I would want your old one back just to open it up. Thanks
Rich