A/C compressor not engaging when switched to MAX

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Joined
Feb 20, 2020
Messages
1,043
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Location
North Georgia
My Car
1972 Mach 1 dark green
Still trying to get my ac working well.  I noticed today the compressor was engaging when on fresh but when switched to max it did not.  What shall I look at first to fix this?

 
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The AC clutch is engaged with a microswitch on the dash control assembly. If that switch is out of adjustment, it may disengage when you move the lever to MAX. There is also a deicing switch in the same circuit, that's mounted to the AC box and has a sensing bulb in the evaporator. 

 
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You are correct!  I just finished installing this rebuilt unit today and now all controls work like they should.  Max air now engages and the 2nd fan speed, which I did not have with my old unit, also is working.  Now to pack up my old one and send it back for the core money.   https://www.ebay.com/itm/164701938353

 
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