RICHARD49

Hello I had a amp installed and speakers about a year ago working with np problem.and all of sudden this happens I ve checked the ground, voltage going to the amp, remote wire going to the amp it all checks out good. I even took the battery one of the battery post lose for a min Put it back on. With my truck off. The key out of it i can press the radio button and It will pop on and my dash screen pops up allso showing my mileage. It won't play tho. I can press the radio button and it will go off. Is that normal ? When I put the key in and the door is open its dings for a min then cut the radio on then all I hear is a popping sound going in and out. like its trying to play .I can barely hear the music and its popping at the same time. I have to cut it radio all most all the way up to even hear it a little bit. This happen to day allso. Now when I put it in reverse my screen said service rear vision system. It has been working fine. If anyone knows something I can try please give me a hand Thanks

2015 Chevy Silverado 5.3 crew cab ac conpressor quit.The cluth looked up. Bought new GMC conpressor. It has 1.4oz in it. I drained out 1oz of oil from it. I changed expansion value out.Do I need to add any more oil tag 46 to it. Before I install Thank you