Well, it's a palmy 55 degree this morning so I turn the heater on for the first time this year. Suprise, only cold air coming out. I even crank all four zones to 90 and still only cold air coming out.

Anyone had this problem? Is this something I can tinker with or I have to visit the dealer? Thanks

 

Do you have KC on your car?

 

Yes, does that affect the heater?

 

I have the same problem. My MB tech friend said he will fix it for me.

 

Can you ask him what's the fault?

 

its your Heater Control Valve buddy... happened to me i changed it my self and back to bushiness...

https://mbworld.org/forums/e-class-w...rol-valve.html

good luck