I just bought a 2006 Ram 1500 a month and a half ago and I am having a problem with the air conditioning. After the truck has sit for a while (say overnight) and I crank it up, the A/C will work fine. If I stop and turn the engine off for 5, 10 or 15 minutes to go in a store for instance, and crank it back up, the A/C will not come on. A couple of times it has taken a minute or two and it started blowing again but then today it never came back on. Any suggestions?