Thanks all for the quick responses.



I started the car, pulled the plug out of the pressure switch, and nothing changed (with the AC button on or off). I didn't have a second person to help me so I couldn't watch it while the car was starter, but I'll try that later today.



I did double check that the pressure switch was not physically damaged, and the connector was plugged in solidly.



Would this indicate a bad aux fan then? Where does it say that the aux fan has to be running for the AC compressor to start?

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2003 3.0 5MT Topasblau
Purchased in 2016 and sold in 2024
2012 35d Platingrau