MazdaFord626Sux

does not look liek preasure is problem (130low side.. not runing). unless dual pressure switch (dryer) is intermitent. but we tried thermo amp thingy and diferent ac switch unit same thing ac light went away for 3 to 4 secs a a time for about 4 mins to 10 and seems to do it towards begining of use. then it stosp doing it.. we replaced bunch of relays and checked a few grounds.. were lost on it. thermal sensor outside by bumper coudl do this ?