lost AC during WOT pull

[chisho]

After a pull at WOT the AC cut out and the compressor clutch wont engage. AC was working great before this. Checked fuses and connections everything seems OK.

from FORSCAN

 

[kryptto]

After a pull at WOT the AC cut out and the compressor clutch wont engage. AC was working great before this. Checked fuses and connections everything seems OK.

from FORSCANView attachment 91111

dont want to throw gas on a bonfire, gotta turn off that AC during a planned WOT. Any codes under the DTC? just a shot in the dark, disconnect the car battery for 10-15 mins.

 

[yaycandy]

On other vehicles at wot it usually would throw an over pressure code and dis engage the ac. Usually just clearing the codes reset it. Or un plugging the bat tree. Doubt there is an issue with anything. Just a safety shutoff hopefully.

 

[chisho]

On other vehicles at wot it usually would throw an over pressure code and dis engage the ac. Usually just clearing the codes reset it. Or un plugging the bat tree. Doubt there is an issue with anything. Just a safety shutoff hopefully.

I had a new battery waiting to go in so I installed the new battery. Same issue. No DTC codes. on the SHO is there a relay for disengaging clutch at WOT or is it controlled via a module?

 

[Texas Marauder]

AC cutout is controlled by the PCM from the throttle position sensor.

 

[SHOdded]

do you have a scanner capable of grabbing the Bxxxx codes? most scanners only grab Pxxxx codes. the climate control module should be able to run the diagnostics also but not sure how it is on the SHO.

is the no a/c condition at any speed? check the radiator fans if only below 40+ mph.

 

[Texas Marauder]

He's using FORScan which can scan all modules for DTCs. What are the codes, if any?

 

[Jordan_R]

If you find out you need an AC compressor let me know as I have one with 72k on it I'd let go pretty cheap.

 

[Zpak]

If you find out you need an AC compressor let me know as I have one with 72k on it I'd let go pretty cheap.

Hahaha
What does that useless civilian drivers seat look like?

 

[SHOdded]

He's using FORScan which can scan all modules for DTCs. What are the codes, if any?

do you know which adapter ... can it scan the ms-can bus?

 

[kryptto]

Wasn't quoting shodded, was posting response for OP

Yes I asked ya for this as well. TX has cited an Amazon adapter for less he uses. You can get the adapter I have in my signature as well from Amazon.

That all being said I share this with you, don't thank me but donate something to him if he fixes your issue:

 

[Texas Marauder]

Recommended by FORScan.

Amazon.com

 

[chisho]

update: I am guessing it went over pressure and leaked on the high side somewhere. I can't find a leak but it was low and I filled it now its working. I added some UV dye and will see if any leaks pop up.

on a side note I picked up some mustang wheels which I think look great on the sho

 

[Shadow351]

Uh, every Ford I've ever owned has shut off the A/C at WOT (Except my new truck which is a Hybrid and i believe uses an electric A/C compressor) to reduce parasitic engine load. My dad said his 1973 Mach 1 had a switch on the carb that would cut the A/C out at WOT. I think this is expected behavior.

Did it come back after you let out, or did it stay off?

 

[chisho]

Uh, every Ford I've ever owned has shut off the A/C at WOT (Except my new truck which is a Hybrid and i believe uses an electric A/C compressor) to reduce parasitic engine load. My dad said his 1973 Mach 1 had a switch on the carb that would cut the A/C out at WOT. I think this is expected behavior.

Did it come back after you let out, or did it stay off?

I recharged it and it came back. The high side was low so my guess is at WOT it went over pressure. It could have something to do with the tune I have but I am just going to make sure AC is off before flooring it again.