Typical York OBA set up in a TJ, using the adjustable in-a-grey-plastic-box type pressure switch. Everything's been working fine for about three years. Today it started acting wierd - turn on the York and it cuts on for about three seconds, then off for about five - over and over until it reaches the proper pressure. Three seconds on, five off, over and over like clockwork.

So I can air up, run the ARB, etc., its just the damn thing it taking forever to get up to pressure.

The only thing different about today was it was about 5 degrees and the heep had been sitting in that temp (and much lower) in the garage for a couple weeks, but nothing changed after the engine compartment got good and warm.

I know I need to cut the clutch wire and set it to the pos battery terminal to determine if the problem is clutch or switch. I'm afraid it might be the clutch - once or twice when it cut on it sounded like it was really dragging on the engine.

Does this sound like anything that's happened to anyone?

It is possible that the pressure switch is getting cloged with oil from the York and the cold temp is adding to the problem. Try takeing the PS appart and clean out with carb cleaner.