I have posted this on the UK MB site, but have not been able to find the answer to the location of the compressor and I am hoping someone here will know where I can locate the compressor/airpump for the feature.

I have 209 CLK with comfort seats in the front, that is what they are called down under. They have 4 toggle switches on the centre side of the seat to adjust lumber, seat back shape etc by using air sacks to change the seat contour. Both sides have failed on my car, but will occassionally work, very occassionally (maybe twice a month) and then for only a minute or two. Anyone had experience with these seats and can advise what to look for. I guess there must be a common compressor somewhere, which I assume turns on when any of the switches are pushed to the + side.
Any clues where I can locate the compressor/airpump?

Regards Ingin

Behind vertical left boot trim. Sits in the cavity between stop lamp and fuse box.

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Thanks Guru, I will take a look regards Ingin