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GLK-Class (X204) Discuss the upcoming GLK-Class. Models include GLK 350.

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Old 10-15-2010, 11:11 AM   #1
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Low tire pressure warning

So temperatures fell a bit and it's been raining. Just like a year ago during this time tire pressure system starts giving warnings.

Last year that happend a coulpe of times, but the only warning was on MFD saying check tire pressure.

Yesterday I started driving (cold and rainy) and MFD turned red and the yellow sing came on as well (i thought i got flat tire or something). Haven't check pressure yet, but tires seemed fine (no flats). Wondering if amount of tire pressure loss makes warning different. I wish I had new system that tells you actuall tire pressure in each tire (I think later 2010 models have it).
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Old 10-15-2010, 11:41 AM   #2
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Yep this year I only had the check tire pressure warning. May be due to the temp drop as you said. Had to top it off and I haven't seen anything pop up lately.
Last year I got the whole panel turning red with chime as I was driving ... turns out I had a puncture in my tire which caused the tire to lose like 10psi within a few days. It could be related to the actual pressure difference but couldn't find anything in the manual.
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Old 10-15-2010, 12:57 PM   #3
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So temperatures fell a bit and it's been raining. Just like a year ago during this time tire pressure system starts giving warnings.

Last year that happend a coulpe of times, but the only warning was on MFD saying check tire pressure.

Yesterday I started driving (cold and rainy) and MFD turned red and the yellow sing came on as well (i thought i got flat tire or something). Haven't check pressure yet, but tires seemed fine (no flats). Wondering if amount of tire pressure loss makes warning different. I wish I had new system that tells you actuall tire pressure in each tire (I think later 2010 models have it).
Nowadays you cannot tell by looking at the tire and guesstimate the pressure. Just becaused it looks fine, not flat, doesn't tell you anything. But a good tire gauge will.
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Old 10-15-2010, 01:39 PM   #4
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My 2011 still have the generic TPMS
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Old 10-15-2010, 05:16 PM   #5
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checked the pressure, nothing spcial. All tires were at 30.5-31 PSI. Brought them up to 34 and reset the monitor.
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Old 10-15-2010, 10:48 PM   #6
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TPMS

You Americans got the good TPMS because NHTSA mandated tire pressure monitoring for the TREAD Act.

USA = direct measure at the valve stem giving actual psi / bar

Canada = indirect measure we got the cheap tire rotation "estimate" via the ABS sensor. I tested mine and had to drop the tire pressure around 20 psi to get the dash warning light on...

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Old 10-16-2010, 11:14 AM   #7
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One way around this is to bring the tire pressure up a bit higher, than when it gets cold and the pressure goes down, the warning doesn't come on.
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Old 10-22-2010, 04:37 PM   #8
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Not certain if it is a myth or not, but I had been told nitrogen is supposed to lessen the effect of pressure deviations.
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Old 10-23-2010, 12:04 AM   #9
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Not certain if it is a myth or not, but I had been told nitrogen is supposed to lessen the effect of pressure deviations.
Your right if I lived on the mainland with winter/summer conditions I would have nitrogen in my tires. Not a problem in Maui
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Old 10-23-2010, 10:01 AM   #10
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Your right if I lived on the mainland with winter/summer conditions I would have nitrogen in my tires. Not a problem in Maui
stop bragging about Maui and your nice all year weather ... only kidding! What do you do there?
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Old 10-23-2010, 10:33 AM   #11
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Not certain if it is a myth or not, but I had been told nitrogen is supposed to lessen the effect of pressure deviations.
It's not a myth, and you're right, in a way, it lessens the effect of temperature variations: http://www.apa.ca/template.asp?DocID=97, scroll down to Nitrogen.

An APA note:
"It’s important to adjust tire pressure in the autumn, because the drop in temperature causes the air pressure in tires to go down significantly: tire pressure is reduced by 1.7 PSI (0.12 bar) for every drop of 10°C in temperature."
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Old 10-23-2010, 05:11 PM   #12
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stop bragging about Maui and your nice all year weather ... only kidding! What do you do there?
retired
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Old 10-25-2010, 07:44 AM   #13
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retired
nice!!!
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Old 10-25-2010, 07:44 AM
 
 
 
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2010, 350, check, flat, glk, glk350, light, low, mercedes, pressure, raining, reset, sing, tire, warning



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