OK, I know that most of you wouldn't think of using the AC this time of year, but here's a tip that might prevent problems come summer.

Every time you stop for fuel, turn on the AC for a few minutes. This will circulate the coolant and the oil and keep the seals wet.
By doing it at refuel time, it is easy to remember. If you don't use it at all for four or five months, there's a chance that it will leak when you do turn it on next summer.

(Of course, if it ain't working anyway... don't bother.)

Cheers,
Wes