[JustAnN55]

I’ve got a 2016 535i xdrive. On the first hot day of the summer, I noticed the vents would not blow cold air even with AC button illuminated. Checked under the hood and and the compressor wouldn’t engage. Tried to do a recharge and it wouldn’t take any refrigerant (makes sense as compressor is not engaging). Fast forward about a month, the car had to go to the body shop to repair damage from a shopping cart. The owner evacuated the system at no cost and even tried to recharge it with the same issue; car wouldn’t take the charge. Now we’re here. 90° days, no AC. And no ideas. My simple brain says compressor is locked up. But my pragmatic brain says that’s too easy. Fixing the car isn’t so much the issue as I’m cable of that part myself. But I don’t wanna just start throwing parts at it without knowing the problem. I did have the car checked and the only HVAC code that’s shows is that the compressor is shutdown due to negative pressure (no refrigerant). So my big thing is, how do I get refrigerant in the system if the compressor won’t engage because there’s no refrigerant? I know I could technically bypass the low pressure switch to force the compressor to engage (if it even will) but it’s a 4 pin connector and I don’t know which to jump. And if I’m not mistaken one of them should be a 5v lead that could potentially brick ECU if i mess it up. Any answers that may lead in the right direction would be greatly appreciated.