QUOTE (J&J @ Nov 21 2008 - 12:03 PM)
My light went on 3 days after the snows were installed. The rear pressure was 29 psi both sides and it was -4 outside. I assume when the dealer installed them they did it inside with a room temperature of +70ish. I added some air (to 34 psi) and have not have a problem since.
The car rode really well with 29-30 psi in the rear tires and the same in the fronts - no problems with cross winds or passing trucks! I will now be playing with the tire pressures to find the best ballance front/back combo - it is not the pressures posted on the door!
So I thought while I had the compressor out I would check the pressure in my other vehicles - they don't have TPMS and the tires looked OK but why not check, I hadn't checked them since September.
My astrovan normally has 34 psi - today had 27psi all around
My focus normally has 32 psi (low profile tires) - today had 22.5 all around!
So it is not just the smart tires - it is all tires - especiallly low profile tires. If you havn't checked the pressure in your tires in cold weather, you certainly should - all your tires.
Now that ny hands have warmed up, I am out to add more air.