A/C Issue, blowing hot air, FSR issue?

[diddy0071]

So I'm back! After the car running great, I noticed 2 things:

Well some backstory first, I have replaced the FSR 2 separate times in 1 year.

Last week the A/C stayed on after turning the car off. When I mean turned on, it showed the display with 16ºC instead of the 60ºF, and pushing the buttons on the display did NOTHING. The fan wasn't blowing at all when it did this. I removed fuse #45 and the display turned off. Replaced fuse and the following day the A/C started only blowing hot air. I don't think the clutch is coming on anymore either. I noticed the aux fan was not coming on either, and thought it might have gone out...again. I had the Aux fan and Clutch replaced last year for almost $1000 dollars at a mechanic with 1 year warranty (could have already passed warranty because it was in July when I replaced it). Anyways, the other night, I got out of the car and heard the fan spinning and saw it physically spinning. SO I jumped back in and turned it on and turned the A/C. Still hot air! I drove it around, still hot air. Came back and parked it and the fan had gone off! UGH!!

So I thought, well maybe the refrigerant was out. I went to autozone and bought a can of R134a with the gauge. When I plugged in the gauge, the needle did a complete spin and lodged itself underneath the 0psi starting point (there was a pin to hold the needle) So It seemed WAY over pressurized. I released pressure and got it down to 0 PSI. Started putting the can in. 2 short squirts and it was overpressurizing again. WTF? The can is full of refridgerant, I couldn't have put that much in already! I released the pressure and placed it to the recommended level. Still, hot A/C. At this point, I'm stuck. Where do I look for replacements?

Side note: the Thermostat appears to be stuck open, and I am in the process of purchasing a new one in a few weeks when I get paid again. Amazon has the Thermostat, Temperature sensor, Aftermarket complient coolant and shipping for about $120 total. I plan on doing it myself. But my question is, could the thermostat be causing the A/C problem? I notice my gauge on the temperature reads at the 1/4 mark, not the halfway mark very often, even after driving for a while. I took a roadtrip Tuesday night to Fresno (about 200 miles away) and the temperature only got up to halfway once in the whole trip.

Anyone have a clue? 2001 BMW X5 3.0i 06/2001 build date.

Thanks!