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Fan not turning on with A/C

Posted: 2022 May 23, 19:26
by ryanstout88
1989 Mustang with a complete 4.6 swap from an '02 Mustang GT (wiring harness, CCRM, gauge cluster, etc.).

Drivetrain was stock last year, all functioned normal and drove great.

This year I added a Paxton blower and supporting mods, using TunerPro and a Quarterhorse with an FBGI0 definition. Tune is working pretty good, but still a work in process.

Here's the issue...As the title says, neither my low nor high speed fan will turn on with the A/C. It functions normally, otherwise and with the A/C on, it'll still cycle on and off with engine temp and the compressor still kicks on and off, the fan just ignores that the A/C is turned on. This started when I installed the quarterhorse.

I have attached the file I'm using if anybody would like to take a look at it for me.

Thanks!

Re: Fan not turning on with A/C

Posted: 2022 May 23, 21:05
by decipha
post your ecu tune file too

no need in posting the xdf

Re: Fan not turning on with A/C

Posted: 2022 May 24, 06:23
by ryanstout88
I’m lost on what file you need, you may need to get out the crayons LOL.

The ecu is an MDE2.

Re: Fan not turning on with A/C

Posted: 2022 May 25, 18:39
by decipha
read the tune off the ecu that has the fans operating correctly

Re: Fan not turning on with A/C

Posted: 2022 May 26, 15:22
by ryanstout88
Ahhh, my bad. Honestly I never pulled the stock file out before I started the project. I just grabbed the FBGI0 and started going to town.

TunerPro is cool, but I'm still set in my HPTuners ways, haha. I'll see if I can compare em tomorrow morning and see what's up.

File uploaded.

EDIT: Wow, apparently I have a few things that I need to go through when I get a moment to sit down and compare these. I'll post if I get it fixed. I really appreciate the willingness to help, I still may need it.

Some of these tables in the stock bin look pretty messed up (borderline knock, MAF transfer, to name a couple), did something happen?

Re: Fan not turning on with A/C

Posted: 2022 May 26, 18:28
by decipha
your looking at two different strategies so it not going to be show correctly

thats just a stock mde2 file

i dont see anything that would cause the fans not to work correctly

Re: Fan not turning on with A/C

Posted: 2022 May 26, 18:43
by ryanstout88
Weird. I’ll do some digging with it later tonight and if nothing else, I figured I’d wire up something like this…

Re: Fan not turning on with A/C

Posted: 2022 May 26, 21:49
by decipha
if it worked before it should work now

id gove it a good look over

Re: Fan not turning on with A/C

Posted: 2022 May 30, 13:30
by ryanstout88
Update: I have narrowed it down to a CCRM issue.

I should've ran through everything first, but figured that the last thing I added was the Quarterhorse. Thanks for looking over it for me, Decipha, it's appreciated.