A/C request

[dhworkin]

I am installing the A/C and I need a request for the e-fans. I would like to use pin E3, can I make changes for that purpose only and not use the thermostat part?

[B52Bombardier1]

Hello,

Which PCM? Its hard to know what pin E3 does or doesn't do without knowing the type of PCM. As for me, I control my fan in conjunction with my AC compressor using a fan relay / control / thermostat assembly - Four Seasons part number 35879.

https://www.ebay.com/itm/193913583576?chn=ps&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&itemid=193913583576&targetid=1068323850670&device=c&mktype=pla&googleloc=9025463&poi=&campaignid=11614425263&mkgroupid=114834261282&rlsatarget=pla-1068323850670&abcId=9300456&merchantid=116331039&gclid=Cj0KCQjwvYSEBhDjARIsAJMn0lh6RA3wSqdXkHXHS_km 1XAiz8VHMnF-pPeVzaFiRC8r916ajVA3dZkaAmlOEALw_wcB

Rick

[dhworkin]

It’s a 7427 in a 95 truck. I’ve got the fans with the thermostatic switch installed and working well. Problems start when I connect the 12 volt wire from the A/C compressor to the relay. Don’t know if it’s back feeding or stealing power. If I would of found the e-fan hack before I installed I wouldn’t have used the thermostatic switch that came with the fans. As of now I wired a switch in the cab to send a ground to the relay for A/C request.
The e-fan hack stated that you can use all or part of code to do what is needed for your setup. I don’t understand what to change in the hex editor to send a ground for A/C request only. I hope someone here can help, I wired the AFR to the pcm to use for wideband tuning and was thinking I could do this.

[Kitch]

Initally had both my electric fans running from a dual relay setup (relay for each fan) to a fan controller, temp control came from a sensor I installed in the side tank of the radiator and a supply tapped in from the A/C clutch wire.
When I went to the fan hack I left one fan running via the temp sensor and clutch connection and the second fan running seperatly via the fan hack.
I just liked the redundancy it gave me if one method of fan control failed.`
The fan hack has some nice features for control of the fans but from memory I could only get the basic one to run, uploading the more advanced fan hacks crashed my PCM.