I have a 92 'vette lt1 with the automatic. Im having troubles with the a/c. It has the electronic temp controls. One day the a/c quit coming on, i checked the clutch i know its fine, i went ahead and converted to 134a and the pressure is good. jumped the pressure sensor no luck. so i decided it must be the clutch relay. i took the old one out and took it into o'reilly so they could match it up, they had to order it so i ordered two. when i put the old relay back in and went on my way, the car started heating up and up and up so i turned on the heat and tried to keep moving until i got home and when i checked, the fans weren't kicking on. so i found another one of the same relays elsewhere in the car and put up at the a/c relay wires, fans worked, but no a/c. When the two new relays came in i replaced both the a/c and the one i had robbed. but no a/c and no fans, i removed the lower relay, (i'm not sure what it is) and the fans worked but no a/c. i did find that I could jump the two wider terminals at the a/c relay location and make both the compressor adn the fans run all the time. any ideas?

In my experiences with these multiple types of electrical issues it usually was a short or a loose ground somewhere, I mean that is the only thing I can think of that would be causing this.

That does sound like a loose ground, good luck with that.