Richard Moakes
Senior Member
- Joined
- May 19, 2002
- Messages
- 2,195
- Reaction score
- 1,147
- Location
- Newton Abbot, Devon, UK
- Your Mercedes
- CL500; ML500
Do not forget the circulation pump,,, when the duo valves are working correctly, you can feel the pulse on the outputs, some thing like a heart beat
Had this problem on my W124, turned out to be the electric circulation pump.
Looks like number 26 on the parts diagram.