Quote:
Originally Posted by Old66Tiger
Good thread. I have a few questions...
I am running an E38 ECU and currently have it set up in discrete mode with a pair of spal fans. I understand that programming is required to switch to PWM mode. I also understand that a binary or trinary switch is required to control the vintage air compressor for over or under pressure conditions. My question surrounds the need for a high pressure signal from the a.c. system to kick the fans into high speed. Is it possible to let the trinary switch send a ground signal to the ECU to send the fans to high speed when the a.c. system requires it? I have an a.c. input from the speartech harness for an a.c. input. Otherwise I will need to wire in a second switch into the #6 line between the condenser and the evap.
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Best solution is to use trinary switch to control compressor and AC pressure sensor connected to ECM to control fans through PWM control. No way to have both (and no need).
Whole set up is described in detail in prior posts.
Hope this helps.
Dave