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M380 (Unique Issues) If you have a unique issue with your M380 model coach and it can't be answered in one of the other forums here, then this is where you can list it.....list your M380 Parts here too.

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  #1  
Old 12-05-2019
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chiplamb chiplamb is offline
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Default M380 aux air compressor pressure switch

Cold temps playing havoc with my aux air system, onboard compressor did not raise above 30psi this morning (Don put an aux and slide air pressure gauge on the dash, very handy). Dumped jacks and started bus to make sure I did not have a stranded condition, I did not. Front HCV is due for replacement as well, but pressure switch up high in the driver's street side compartment seems to be leaking as well. Any tips on its function (12 or 110V?) and its replacement part? At least it's not supposed to rain while I'm here...
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2004 M380 99k/22xx hours
1987 FC35 TMU/42xx hours
Former: 90 SP36, 92 WB40, 85 FC35SB & others
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Old 12-05-2019
Jim Brookshire Jim Brookshire is offline
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The ones that have been on my coaches all have been generic pressure switches. Some have had a manual lever on the side. Shouldn’t be hard to find.

Cold temps seem to bring on air issues. Must be small amounts of moisture freezing. More reasons to head south when the birds do.
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Last edited by Jim Brookshire; 12-05-2019 at 10:40 AM. Reason: Added info
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Old 12-05-2019
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Sometimes the pump will not be able to get enough flow to close the dump valves, and temp can be a part of that. When that happens you will hear air escaping at the dump valve. If that's the case, running the engine until pressure is above 45 will do the trick, and turning the engine off the pressure will continue to rise.
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Old 12-05-2019
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Do a WOG Search for “Pumptrol DonB NoGas”. Top couple hits will have threads of interest to you.

Recently, the pressure release valve on one of my Pumptrol switches (coach has 2) was acting up & would not close. A quick squirt of silicone “fixed” it. Those switches are inexpensive & available at rural HD’s.

Sometimes when raising my suspension using only the 120v Aux pump it cannot produce enough volume to overcome the dump valve release, and the coach will rise on one side but not the other. Dumping again and starting the engine has always “fixed” it. As Don said: once the dump valve is sealed (OFF) using engine air, you can shut the engine down and the suspension will continue to rise using the 120V Aux pump. Do not use the 12V air pump as it’s main purpose is to keep your slide seal(s) inflated when off-grid.

Realize one of my rear HCV valves needs some attention. Eventually that project will rise to the top of my to-do list .
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Last edited by NoGas; 12-05-2019 at 12:45 PM. Reason: Fixed wording
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Old 12-05-2019
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chiplamb chiplamb is offline
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I think my 12V compressor is just along for the ride at this point, my slides only get air from the 110V. You may be right and it's the dump valve that won't catch up. I also have that one side and not the other regardless if temperature unless I get it just right.
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Chip Lamb
Augusta, Georgia
E-MAIL OR CALL - NO PM
chip@collectorsco.com / 804-357-4926
2004 M380 99k/22xx hours
1987 FC35 TMU/42xx hours
Former: 90 SP36, 92 WB40, 85 FC35SB & others
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Old 12-05-2019
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chiplamb chiplamb is offline
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Quote:
Originally Posted by Jim Brookshire View Post
The ones that have been on my coaches all have been generic pressure switches. Some have had a manual lever on the side. Shouldn’t be hard to find.

Cold temps seem to bring on air issues. Must be small amounts of moisture freezing. More reasons to head south when the birds do.
I'm in Raleigh for work! Bit cool here for fun, but I'm having fun anyway!
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Chip Lamb
Augusta, Georgia
E-MAIL OR CALL - NO PM
chip@collectorsco.com / 804-357-4926
2004 M380 99k/22xx hours
1987 FC35 TMU/42xx hours
Former: 90 SP36, 92 WB40, 85 FC35SB & others
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