The wife's truck. Theac blows ambient and after you press the a/c button it goes solid for about 5 seconds then starts flashing. In the beginning it would squeal for a few seconds but doesn't do it anymore. I googled and found the relays were **** so I replaced the clutch one but no change. Any idears?

 

make sure your compressor isn't locked up.. try spinning it by hand.. engine off of coarse. Check for any obvious leaks in the a/c system too. I don't know how the electronics and diagnostics systems on our trucks work but it all works in the same way basically