on my GM's.
2010 traverse and 07 Impala.
our Onstar email comes every x days from the previous one.
It usually takes the sample- at 1st engine start of that day.
which is usually when we go to work.
This is also 1st thing at 630 am. at the coldest part of the day pretty much- when the tires are at their lowest.
when you got the email--- you may have already driven some miles to warm up the tires- and get them up to their proper range...
and you got an OK reading.
When I set my tire pressure-- I will put air in tires the day before (to about 39 PSI)- and the next morning- at their Los Angeles coldest- will AIR DOWN the tire to 35 PSI.
this way- for the next month or so-- the tires will always be at 35 PSI at their coldest.
If I see PSI drop below that-- either the temps have dropped more-- or air has slowly been lost over the previous x weeks.
2010 traverse and 07 Impala.
our Onstar email comes every x days from the previous one.
It usually takes the sample- at 1st engine start of that day.
which is usually when we go to work.
This is also 1st thing at 630 am. at the coldest part of the day pretty much- when the tires are at their lowest.
when you got the email--- you may have already driven some miles to warm up the tires- and get them up to their proper range...
and you got an OK reading.
When I set my tire pressure-- I will put air in tires the day before (to about 39 PSI)- and the next morning- at their Los Angeles coldest- will AIR DOWN the tire to 35 PSI.
this way- for the next month or so-- the tires will always be at 35 PSI at their coldest.
If I see PSI drop below that-- either the temps have dropped more-- or air has slowly been lost over the previous x weeks.
