Since CLK320MIA did not respond on the outcome of the replacement switchover valve block, I'm curious if MBDoc has any suggestion on -

"The center vents close when I accelerate and open when I let off the pedal. I get more defrost when I accelerate as well. "

My S-Class 92 400se is suffering from a similar problem.

Thanks,

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Russell McMahon
Tulsa, OK
2001 CLK 320
1992 400se
1993 400e
2000 320ML