1.When the AC works, I still get hot air out of the side vents. Not the case with my 93 190E 2.6. I'm guessing some sort of vacuum or switchover valve fault?

2. The AC has been intermittent but now doesn't work 90% of the time. The pressure switch seems fine, the system isn't low, I've replaced capacitors and resoldered the board in the KLIMA relay, but it's only gotten worse. Seems to not be a problem with the Tempmatic unit itself (I can certainly test with a known good one).Before when it sorta worked, it would typically cut out and the not cut back in under extended acceleration. Might be related but the tach works but will once in a while the fuse it is on will blow, and the cruise control used to work but currently doesn't. Any ideas of what would cause the AC not to run?

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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon.