thermatic heater controlsw203,220cdi

[silver sam]

no heat on passenger side , drivers side ,ok any ideas .Just new to this site

 

[peapod]

Sam search for "cleaning the duo valves" or "duovalves". Two electrically controlled valves in the heating pipes near the brake servo (on W210 ) bit fiddly but sorted my same problem.

 

[1998K]

May be I'm wrong but as I remember W203 does not have due valve as w202 and W210