I have an 86 Jayco 5th wheel with a Nor-Cold frige in it. I was wondering how long it should take for the frige part to get cold when using Gas. The freezer got really cold fairl quick but the frige doesnt seem to be cooling. Its been about 3 1/2 hours. I live in So. Cal so its fairly hot here. Also the unit does not work at all when I try to switch it over to A/C. Thanks in advance