21-04-2026, 03:24 PM
old thread but putting this here for reference, shorting pin 1 and 3 on the brown pressure sensor connector plug DOES trick the system into powering the high speed fans when the AC button is pressed but DOES NOT engage the compressor (2001 HDi) shorting pin 2 and 4 on the brown pressure sensor plug does sends power signal to the compressor. I've tested this so you can short pin 1 and 3 and leave the brown pressure sensor plug and the compressor plugged in for a working cooling fan override solution.