Why does the fuse keep blowing on repaired AC? Now radio dead too?

Help! I've had my Safari about a year and a half, and I love it, but I can NOT seem to get the air to work. And I have spent well over $1000 on it! First of all, it is a 1999, but I am told it has a 2000 engine. Not sure if that changes anything. Shortly after buying it, I got a cd player installed. Within 2 weeks of that, the cluster went out. Replaced it. Then air started blowing only out of the dash and rear, and never did blow on high ever. Was told it was the resister and blower motor and hoses. Replaced all those. Was told wire harness melted due to bad resister. Replaced that. Charged with freon, which ran out in about 2 weeks. Suddenly, with no AC switch on at all, the van died in the middle of the road. Was told compressor was bad. Replaced it. The mechanics then could not get the AC to stay on for more than a second without the fuse blowing. They went through a box of fuses with the same result. Now they say it's the control panel. Replaced it. Still the same problem. Fuses blowing. Now the radio is not working either. Fuses for it are fine though. I don't know what to do now. We have had many mechanics look. We have done everything they said to do, and used up all the money we DIDN'T have, and it's worse now than before we started. HELP!