For the first couple of minutes when I turn on the A/C after being parked outside on a hot day, it smells like a swamp. I suspect the evaporator drain might be clogged with a mud dauber nest or something, but I can't find the drain. Anybody know where it is? Dealer is so-far unhelpful, said to look for a tube hanging down on the right side (no tubes hanging down anywhere), or bring it in for service.