When I turn on the A/C the cooling fan is suppose to come on and stay on constantly as long as a/c is running well mine does'nt when I turn a/c on the cooling fan will come on the go off.IT will come on when the high side gets to about 320 to 350 then the pressure drops down to 230 and fan shuts off then pressure goes back up to 325 fan comes on agin,It just keeps doing this as long as a/c is running.If you turn a/c off fan works normal only comes on when the temp gets up there.Whats the deal here can you help.I just had the compressor and orfice tube replaced but it did it on the old anyways so that does'nt have anything to do with it.Please help before it get real hot around here.