Dear Tom and Ray:

I've heard that one should periodically turn on one's air conditioner, even in the winter, to keep the internal parts lubricated. Do you agree with this recommendation? And how periodically are we talking about? -- David

Ray: Yes, I think it is a good idea to use the air conditioner -- I'd say once a month or so -- even in the off-season to prevent the parts from drying out and seizing up. But it's not something most people should ever have to think about.

Tom: In all but a few cars these days, the air conditioner is automatically activated whenever you turn on the defroster (which most people do at least once a month, right?). "Conditioned," or dryer, air is preferred for defrosting because it's being used to remove moist air or condensation from the inside of the glass.

Ray: If your car doesn't automatically link the defroster and the air conditioner (some cars, mostly Japanese makes, have a separate AC button), try using the AC whenever you defrost your windows. Not only will they clear a lot faster, but you'll help keep your air conditioner in good working condition.

Tom: And don't forget, you can use the heat and the AC at the same time. You'll end up with dry, warm air. And you won't harm either system, since they work completely independently. *** Pre-owned cars can be a great bargain, and reliable, too! Find out why by ordering Tom and Rayís pamphlet, "How to Buy a Great Used Car: Things Detroit and Tokyo Donít Want You to Know." Send $3 and a stamped (55 cents), self- addressed, No. 10 envelope to Used Car, PO Box 6420, Riverton, NJ 08077-6420. *** © 1999 by Tom and Ray Magliozzi and Doug Berman Distributed by King Features Syndicate, Inc.

Which is cheaper, buying or leasing? Should you keep a car forever or dump it after three years, before trouble starts? Find out in Tom and Ray's pamphlet "Should I Buy, Lease, or Steal My Next Car?" To order, send (check or money order) to Ruin, P.O. Box 536475, Orlando, FL 32853-6475. You can also order online.

© 1999 by Tom and Ray Magliozzi and Doug Berman Distributed by King Features Syndicate, Inc.

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