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Erradic converter when a/c is on

phix-

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So, very of few know much about me and my truck but I figure I would share some details in hopes of tracking down a solution to an issue that I have been seeing on and off. Recently I replaced my TPS sensor and things cleared up quite a bit. The issue though, is whenever I have the a/c on, on a hot day I see the trans fluid get up to almost 180 (normal for a 4r55e). I get what I could say is either a shift flare or sloppy lock up, rev up, and lockup of the converter between 45 and 50mph (its the converter, because my livewire turner is telling me I am in 4th). Now, if I turn the a/c off it goes away maybe I feel the lockup more. If I turn off OD I am in 3rd (per livewire) and I get this harsh 4th shift (when a/c is back on), which is the actual converter lockup.

Now given all that and the searches I have done. I have read this may be the following:

-PCM (reprogram and update, which costs $120 since my xploader is 10+yrs old)
-New alternator
-New A/C compressor

the kicker:
I replaced both already (albeit that they were used, they tested fine). I also have pulley chirping at me and can't figure out if the tensioner pulley or the alternator as they both were also replaced (I had a OD pulley on the alternator previously).

Specs: 4r55e, Raysbestos rebuild, delta valvebodies complete vb swap, FTI 2200 stall converter behind a eaton m90.
 






To anyone following/searching this thread for answers, understand that if you experience this problem. You need to either:

1. Buy a new compressor
2. Not use the ac period.

Excerpt from ac repair man of 30 yrs:

If your compressor is fast cycling (anywhere from 8 to 25, really it should not cycle even within a minute), you have a bad clutch. Which in turn when told to run (via ac controls) will begin to heat the engine bay, tell your PCM to increase transmission pump pressure to adjust for the load being put on the motor (may not actually be a load, simply a bad compressor telling the PCM there is more load on it self the component). As that happens, engagements of your Converter will be harsh and drive ability will be affected. If you turn the ac off (via cabin controls), your PCM then has to relearn the load being placed on the motor and begin to back off pump pressure to allow for correct function and sustained driving.
 






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