Community Forums

Duncanholt · 06-06-2021, 10:53 PM

Have a 2014 Anthem. Lately I’ve been getting a high pressure alarm on the driver’s side front tire. Prior to departure in the am, the left front tire is maybe 3 lbs higher than the right. After driving the temp is up, he left tire is around 12- 15 lbs higher than the right tire. Thee temps are mostly equal depending on which side the sun is shining. Does anyone have an ans or this

thank
Duncan Holt. Currently in Bend/Sisters, OR

FLYING BUTCH · 06-07-2021, 04:27 AM

I have same problem. How much air are you putting bin? Manufacture chart states 125# but my alarm comes on after 100#s????

brobox · 06-07-2021, 05:10 AM

On a 14, what is giving a high pressure alarm? Nothing on my 14 that would have given an alarm for tire pressure. If it's an after market TPMS, sounds like the sun is on that side which will give a higher pressure reading.

Gary.Jones · 06-07-2021, 08:55 AM

What are your 4-corner weights? Have you had each tire positioned weighed separately? If you haven't, you need to get busy and get it done.

On that vintage coach, if memory serves me correctly, you have a front axle that was very close to the maximum load that your coach was putting on the axle. In addition, I believe that all your batteries were essentially right under the driver seat and put additional weight/load on that tire. My memory is that my 2015 Anthem was very close to overloaded on that tire? You got any other really heavy stuff on the driver side???

Gary

ClintH · 06-07-2021, 09:44 PM

Quote:

Originally Posted by Duncanholt

Have a 2014 Anthem. Lately I’ve been getting a high pressure alarm on the driver’s side front tire. Prior to departure in the am, the left front tire is maybe 3 lbs higher than the right. After driving the temp is up, he left tire is around 12- 15 lbs higher than the right tire. Thee temps are mostly equal depending on which side the sun is shining. Does anyone have an ans or this

thank
Duncan Holt. Currently in Bend/Sisters, OR

Yeah had the same issue with my 21 Aspire. Drive axle would go off at 96 psi. Very annoying. Bought a Valor Smart Tool, called Don Rigby at Spartan and he walked me through programing the drive axle TPMS setting. Very easy. He will lend you the tool so you don't have to buy one. I set my base line at 90 psi and now it doesn't go off.

Jyrocharlie · 06-07-2021, 10:37 PM

Quote:

Originally Posted by ClintH

Yeah had the same issue with my 21 Aspire. Drive axle would go off at 96 psi. Very annoying. Bought a Valor Smart Tool, called Don Rigby at Spartan and he walked me through programing the drive axle TPMS setting. Very easy. He will lend you the tool so you don't have to buy one. I set my base line at 90 psi and now it doesn't go off.

Try refilling the tire with air connected to a air drier. A lot of the pressure change from heating comes from humidity in the air used to fill the tire. Some suggest using Nitrogen for that reason. Pure Nitrogen gas contains zero humidity so it is more stable under temperature changes.

Will my tire pressure fluctuate while driving if I use nitrogen?

You will still see pressure changes with nitrogen while driving, but overall your tires will run cooler and at a more consistent pressure than if they were filled with air. Nitrogen does not contain the moisture and other contaminants found in compressed air, so nitrogen filled tires will fluctuate less in temperature and pressure than air filled tires under driving conditions, even at high speed and at high temps.

When you fill up your tires with air from the atmosphere using an air compressor, you are also pumping liquid water and water vapor into your tires. Bleeding liquid water from the line doesn’t remove water vapor. Furthermore, if you don’t remove the liquid water, it builds up over time when you repeatedly pump air into your tires.

Turbojack · 06-08-2021, 10:21 AM

Jyrocharlie, Good info. I never thought about that.

Other problem besides what is said above could be a dragging brake.

757driver · 06-08-2021, 12:36 PM

Quote:

Originally Posted by Jyrocharlie

Try refilling the tire with air connected to a air drier. A lot of the pressure change from heating comes from humidity in the air used to fill the tire. Some suggest using Nitrogen for that reason. Pure Nitrogen gas contains zero humidity so it is more stable under temperature changes.

Will my tire pressure fluctuate while driving if I use nitrogen?

You will still see pressure changes with nitrogen while driving, but overall your tires will run cooler and at a more consistent pressure than if they were filled with air. Nitrogen does not contain the moisture and other contaminants found in compressed air, so nitrogen filled tires will fluctuate less in temperature and pressure than air filled tires under driving conditions, even at high speed and at high temps.

When you fill up your tires with air from the atmosphere using an air compressor, you are also pumping liquid water and water vapor into your tires. Bleeding liquid water from the line doesn’t remove water vapor. Furthermore, if you don’t remove the liquid water, it builds up over time when you repeatedly pump air into your tires.

From all my reading on the subject, 100% nitrogen in a motorhome tire is a complete waste of time and money.

J Gunter · 06-08-2021, 12:47 PM

Quote:

Originally Posted by 757driver

From all my reading on the subject, 100% nitrogen in a motorhome tire is a complete waste of time and money.

I agree. Had it once and temps and pressures were the same as just pure old air.

LETMGROW · 06-08-2021, 12:49 PM

I would get an infrared non contact temperature gun and take the coach for a ride. After a few miles, stop and take the temperature of the front tires, wheels and if you can see them the brake rotors. Especially the rotors. You may have a brake dragging causing heat which is transferring through the wheel and causing the rise in air pressure you speak about.
Normally the wheels and tires should run at nearly the same temperatures and any rise in tire pressure should be fairly even from side to side.
Don't just try adjusting the cold pressures trying to compensate. Find and repair the actual cause to be safe.

wolfe10 · 06-08-2021, 12:49 PM

Quote:

Originally Posted by J Gunter

I agree. Had it once and temps and pressures were the same as just pure old air.

Yup, to the consternation of the "Nitrogen salesmen" physics still applies. Perhaps the salesman didn't do well to either high school chemistry or physics.

Yes, Toto, even Nitrogen follows the Ideal Gas Law where temperature change results in pressure change.