ac help please

[rileydsking]

2001 excursion,was a v10. can't get power to the compressor. worked fine before swap,it has a full charge. if i put power to the compressor it blows cold. i checked all the fuses and relay,they are good. since i bypassed the pcm for the tach to work via fordcummins instructions would this be the problem? i would like to have everything working like factory without toggle switches.

thanks for any help

 

[04fummins]

Do you have a tach signal?

The PCM needs to see a tach signal for it to kick the compressor on.

needs to have both the cam and crank sensors hooked up.

 

[rileydsking]

yes the tach works. but via ford cummins instructions on 99-01 only the cam signal wire is used and you bypass the signal at the pcm conector. pin 85 & 48 are cut from the pcm and wired together on the harness side. i just got it charged friday afternoon and fc was closed by the time i called for help.

you would think if they told you to bypass the pcm they would state other ways for the ac to work..

 

[OnVacation]

I'm fighting through the PCM on mine too. Best I could figure was that I was going to have to energize it straight from the dash, and eliminate the PCM. Once I can tuck away enough cash, I'm doing away with the PCM and going to a full compliment of autometer gauges in the dash. they have so many failsafes to make sure the engine lasts, when you swap it out, nothing else wants to work...