About 4 years ago we noticed that regardless of wheter or not the function selector was on either A/C or MAX A/C, the compressor would kick in whenever the temperature control was turned below half way, in other words, if it was turned down, anywhere in the blue zone, the A/C compressor clutch engaged and the compressor started spinning. I thought nothing of it but since, the compressor has seized. I pulled the two prong multi plug off the side of the compressor to allow it to free wheel and that's the way it has been ever since but I don't want to leave it that way since first, there is now no A/C, and secondly, it has done something with the idle. The idle will hang up at 2,000 revs now when pushing in the clutch for stopping and also, if you now turn the selector switch to ANYTHING apart from the off or central position, the idle jumps up another bunch of revs above the 2,000 and stays there. I don't want to simply replace the compressor without finding out what the problem is and I asssume it's a common problem as a cursory glance at 3 litre Fords at the wreckers shows that many of them have had the A/C compressors yanked. Next, as a 1995 Ranger, if I simply replace the compressor, of course losing all the refrigerant in the process; will it be compatible with todays refrigerants? Thanks very much for any help.