We're on the Blackfoot
The polar plunge that has chilled much of the nation does more than bring out ice scrapers and antifreeze. It can trigger vehicles’ tire pressure monitoring systems overnight, sending nervous drivers to dealers and service centers.
Here’s why a cold snap affects tire pressure and sets off the tire pressure monitoring system (TPMS) warning lamp:
For every 10-degree-Fahrenheit drop in temperature, tire air pressure decreases about 1 pound per square inch (psi), said David Cowger, global sub-system manager for tires in General Motors’ Tire and Wheel Lab. On top of that, tires slowly lose air anyway – the equivalent of between .25 and .5 psi per month – because air passes through rubber.
“So if you last checked your tire pressure a few months ago when it was 70 degrees and now it’s 20, a tire with a recommended psi of 35 could be down to 27 or 28 and set off the TPMS warning,” said Cowger. “It’s very common when the first cold weather arrives.”
GM, along with technician training experts from ACDelco, recommend these tips for cold-weather tire care:
Article Source: http://media.gm.com/media/us/en/gm/news.detail.html/content/Pages/news/us/en/2014/Nov/1119-tires.html