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M_Parallel · Mon, Oct-30-2017, 02:37:02 PM

The aux fan will not be on all the time. The aux fan is either triggered by the dual temp switch or the A/C's pressure switch.

If the compressor isn't running (as per you removed relay) and you temp's don't rise too high to trip the dual temp switch, with the AC being off, the pressure switch won't trip the AUX fan relays neither.

So nothing will happend, but a lit LED on the climate control display.

Mon, Oct-30-2017, 02:37:02 PM	#6
M_Parallel Mr. OEM Join Date: May 2006 Posts: 2,584 Reputation: 0 Location: Home Court	Re: Not your typical A/C (HVAC) question. The aux fan will not be on all the time. The aux fan is either triggered by the dual temp switch or the A/C's pressure switch. If the compressor isn't running (as per you removed relay) and you temp's don't rise too high to trip the dual temp switch, with the AC being off, the pressure switch won't trip the AUX fan relays neither. So nothing will happend, but a lit LED on the climate control display. __________________ '98 M3 3.2 SMG Cabrio • Alpinweiß III auf Schwarz • Deutschland-ausführung