ac help

my daughter has a 02 stang with the 3.8 . the other day she complained that her ac was not cooling so i put my gauges on it and checked the freon. the compressor was on and the low side showed about 35 and high side was about 225. it was cooling good, now today it was not cooling at all and the compressor was not on so i jumped the pressure switch on the dryer and it came on,pulled the jumper and pluged it back in and compressor came back on and started cooling. so do you think i might have a bad pressure switch also about the pressures could the orfice tube be getting stopped up. this car must have had ac problems before with the previous owner because someone has wired the ac clutch 12v+ wire to the outlet side of the pressure switch and the 12v- side to a ground screw.

could be the low pressure switch or the wiring to it.. seems like when you messed with it, it started working again, maybe a short? You could try swapping the ac relay with another relay of the same part number in the relay box. How many miles are on the car / compressor? Pressures dont seem to be off too much.. r134 should be about 2.2 times ambient temparature. r12 should be about 2.0 times ambient tempurature.