This car has always had the best A/C out of all of my cars. It can get so cold, even when 90 out that I actually have to turn the temp knob so that the 22 deg C number is at the very top of the knob.

When I got back into the car after lunch, it stopped blowing cold.
When I got it home, I went through my normal checks:

1. When a/c is on the clutch doesn't move.
2. Clutch does turn by hand with no noticeable resistance or condition issues.
3. By passed the low pressure switch, still no clutch engagement.
4. Inspected the bullet fuses (replaced with copper versions 3 months ago), no broken fuses.
5. Replaced Climate control unit, still no clutch movement.
6. Removed and re-installed MAS (90's don't have dedicated Klima relays), no change.
7. When I turn on the a/c, the engine rev's lower briefly

Seems like I've lost power to the a/c clutch somehow.
What else can I look for?

Thanks,

AL
What else can I do to get the clutch to engage again.

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03 CLK430 Cabrio 211K Pweter Silver/ Oyster Leather
90 300SEL 214k Pearl Black/ Alto Grey/Black Leather

Prior: 85 190E, 88 300TE, 89 300TE, 90 300E 2.6, 90 300TE, 92 300E 2.6, 91 and 93 300SL, 87 Ferrari Mondial Cabrio