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11-03-2018, 04:10 PM
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#1
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Senior Member
Thor Owners Club KZ RV Club
Join Date: Jun 2016
Location: Central, Arkansas
Posts: 325
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Losing Tire Pressure
I always check the tire pressures before leaving on a trip as I suppose many RV’rs do. Our last trip was about 6 weeks ago and the temps were in the 80’s/90’s, but in the low 70’s when I checked the cold pressures.
When I checked the pressures today, all 6 tires were down 5 to 6 lbs. Today’s temps were only in the 60’s.
I inflated all tires to the recommended pressures and checked for leaks around the valve stems.
I find a 5-6 lb pressure loss on all 6 tires odd. I wouldn’t think that a 10 - 15 drop in ambient pressure would cause this.
Has anyone else experienced something like this?
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2018 Thor Freedom Elite 30 FE
2019 GMC Canyon Denali (current toad)
2004 Jeep Liberty (retired Toad)
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11-03-2018, 04:14 PM
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#2
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Senior Member
Join Date: Jul 2014
Posts: 35,349
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Its done it to my car twice.
When the 65° weather came to NY all of the tires needed a few pounds, according to the TPMS.
I got to MD with 45° and they were all low again. I towed it to S.C. and all is well again.
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11-03-2018, 04:19 PM
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#3
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Senior Member
Join Date: Sep 2016
Posts: 593
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That is not unusual on large tires. I have a TPMS and occasionally get a low pressure alarm on cold mornings.... and that would happen more likely when I inflated to the spec on a warm evening a week or so earlier.
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2016 Leisure Travel Vans - Serenty
Toad - 2009 RAV4, 2WD with Remco Lube pump
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11-03-2018, 04:33 PM
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#4
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Senior Member
Appalachian Campers
Join Date: Sep 2002
Location: Dixie !! (north Georgia) USA
Posts: 4,113
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The pressure of a gas of fixed mass and fixed volume is directly proportional to the gas's absolute temperature. Gay-Lussa's Law of gases
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11-03-2018, 08:51 PM
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#5
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,652
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This is yet another fallacy of running the tire inflation/load pressure (it is the minimum allowed for the load) listed, you leave no room for temperature or elevation deviations.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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11-03-2018, 10:30 PM
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#6
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Senior Member
Gulf Streamers Club Ford Super Duty Owner
Join Date: Aug 2015
Location: Memphis, TN
Posts: 4,308
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and further, just dropping 10-PSI (from 80 to 70) on a dually rear axle drops axle capacity by 1,000# (+/-) (Check your charts to verify)
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(TerryH.) 2000-GS Conquest Limited 6266 Class-C 99-E450SD V10
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11-03-2018, 11:09 PM
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#7
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Senior Member
Join Date: Jul 2003
Posts: 4,455
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It sounds normal to me. If they were all showing the exact same psi, then what you're describing is nothing to worry about. If just one were off, then I'd be concerned with that particular tire.
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11-04-2018, 12:02 AM
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#8
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Senior Member
Join Date: Oct 2010
Posts: 1,460
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most likely aggravated by moisture in the inflation air
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11-04-2018, 07:02 PM
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#9
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,563
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Your tires lose or gain roughly 2% of their pressure for every 10 degrees (F) down or up, so a tire at 100 psi checked at 90 F. will read about 96 at 70 F.
You said you checked the cold pressure when it was "low 70's" and again in the 60's, so not very much drop in temperature. Maybe 10 degrees tops. That sounds more like a leak than a temperature variation effect.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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11-05-2018, 02:19 AM
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#10
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Senior Member
Join Date: Mar 2017
Location: Zebulon, NC
Posts: 5,208
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Quote:
Originally Posted by VanDiemen23
most likely aggravated by moisture in the inflation air
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Does that mean that it is time to change to a winter blend air?
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Kelly and Jerry Powell with Halo (Lethal White Aussie), Nash the Rat Terrorist, and now Reid, the "Brindle we have no idea puppy"
2020 Grand Design Solitude 390RK-R
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11-05-2018, 07:30 AM
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#11
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Senior Member
Join Date: Mar 2015
Posts: 2,984
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I always change the seasonal air blend when we switch to/from daylight savings time here in Arizona.
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'04 Newmar Mountain Aire 4016
400ISL/Freightliner
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11-05-2018, 08:15 AM
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#12
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,652
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Quote:
Originally Posted by ThePowells
Does that mean that it is time to change to a winter blend air?
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Yes, only use dry air. The vast majority of air compressors do not have an inline moisture trap.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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11-05-2018, 08:20 AM
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#13
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Senior Member
Join Date: Jan 2009
Posts: 5,345
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Quote:
Originally Posted by FatChance
I always change the seasonal air blend when we switch to/from daylight savings time here in Arizona.
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I change the winter air out on the first day of fall and then change back to summer air on the first day of spring. Just like changing the oil and filter every 1000 miles, it makes it easy for me to remember when to perform these important preventative maintenance procedures.
LandKO, you did use the same device (air gauge, TPMS) at both readings, right? I figure you did but thought I'd ask. Five psi seems a bit much but since it's on all the tires, it's probably just one of those flukes and is ok. Keep an eye on them to be sure...
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03 Itasca Sunova, Workhorse P32 with the 8.1 and 4L85-E
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11-05-2018, 08:22 AM
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#14
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Senior Member
Join Date: Jul 2014
Posts: 35,349
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Nitrogen is very dry.
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