When I bought my motorhome the previous owner said it did this. I found a couple of vaccum lines d/c'ed under the dash to the controler and it worked fine for two trips. On the way back from a week long trip it blew the fuse with the ac on, multiple times. The weird thing is that it doesn't blow it right away, it takes about 3-5 minutes and may blow faster with higher engine rpm's, but I not sure about that. The previous owner thought maybe the motor had a short and changed it but it didn't fix it. I'm thinking there is a short in the wiring somerwere. Has anyone had a issue like this or have a quick, silver bullet fix for it? Its a 92 27 foot Itasca Sunrise. thats alot. Jason