 1996 windstar ac not working
Hi I have a 1996 ford windstar with 3.8L engine and front and rear AC,
The AC was working fine but it started to blow hot air 2 o 3 times in different days and now it only blows hot air, the radiator fans turn on, pressure bulbs/switches where replaced and still the AC clutch does not engage it has the proper refrigerant level/pressure I checked the AC clutch conector and It reads 12 Volts with my volt meter but still does not turn on the AC clutch I wire jumped AC clutch to my battery and compressor started working and cold air came out what could be the cause of the AC clutch not engaging how can I test to diagnose this problem please include diagrams and instruction thanks for your help. | 
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