I have a 1987 mercedes 300E and my heat is not working. The engine gets warm. My air conditioner works fine. The blower is fine. For some reason, this winter,I can't get the heat to come on. It just blows cold, even with the dial in the the red, all the way to the dot. Any suggestions would be greatly appreciated. Thanks! Chilly in Tennessee, papashey. (I wish -[sm=badbadbad.gif], lol!)

 

Sounds like you need a mono-valve either replaced or rebuilt.