isx fan randomly comes on

think it ended up being the a/c pressure switch pigtail up by the a/c compresser . the pins seemed t be loose poor connection . i removed them from the plug and put some tension them. 2000miles or so and not a problem . other then today it warmed up to 90* and now the a/c compressor wasnt getting any power and turning on. look like the compressor switch back by the blower box/firewall isnt getting any power on either side of the plug.. a/c worked fine 600miles ago. joys of trucks