Hello - I have a '93 w124. It will no longer blow hot air no matter what climate control setting I put it on (auto / ec, etc). The a/c works fine when I want it to and blows ice cold.

I've found a lot of posts around blower motors and a/c's not working, but not where the heating function is the only thing that doesn't work.

I'm thinking it is potentially a bad climate control unit, but I'm definitely not an expert! I'm somewhat handy so if there's any diagnosis I can do with instructions, I'm all for it.

Thanks