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Q. Last winter, the tire pressure in my car decreased in the cold weather and the pressure light came, so I put air in the tire. This happened several times and I found it very annoying. I took it to the dealer and they found nothing wrong; they tested the tire pressure system and put air in the tires. Over the summer it was fine. In my previous car (that didn’t have a tire pressure system), I never had an issue with low tires. Any thoughts?
A. Cold weather does have an effect on air pressure. The typical passenger car tire will lose about one pound of pressure for each 10 degree drop in air temperature (you can work in your own football reference). The tires on your old car were also losing pressure, you just didn’t notice because you weren’t checking them with a gauge. My suggestion is, tire pressure monitor system or not, check the air pressure in your car tires once per month.
John Paul, AAA Northeast’s Car Doctor, answers questions from drivers every week. He has 40+ years of experience in the automotive business and is an ASE certified master technician.