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Old 01-31-2025, 01:41 PM   #1
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Alfa Air Suspension Control Switch Help

My Air Suspension control switch when switched to AUTO will no rase the Chassie up. Where is the three-way valve location on my Alfa motorhome so I can check it or replace if that's the problem. It lowered with no problem but will not come back up after letting air build up.
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Old 01-31-2025, 10:23 PM   #2
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What chassis is your Alfa built on ?
What year is the coach ?
Maybe the control system is common to other motorhomes that are built on the same chassis .

You say you ran the engine and the air built up .
What pressure are you seeing on the gauges ?
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Old 02-03-2025, 03:47 PM   #3
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Quote:
Originally Posted by Skip426 View Post



What chassis is your Alfa built on ?
What year is the coach ?
Maybe the control system is common to other motorhomes that are built on the same chassis .

You say you ran the engine and the air built up .
What pressure are you seeing on the gauges ?
It’s a Freightliner 2005. Both pressure gauges front and back showed 120 psi. Thinking the switching valve on my dash may be stuck. Still activates when switched to lower but does not want to come up for driving.
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Old 02-04-2025, 10:21 AM   #4
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Contact Freightliner's help line ; with your chassis serial number ( VIN ) and ask for an air system diagram , and your chassis build date.

There is a PPV ( Pressure Protection Valve ) that isolates the suspension system from the supply tank ; to save air pressure for braking , should an air suspension bag rupture .
The PPV maybe stuck closed .

Your suspension dump air solenoid , if leaking and not allowing the suspension to come up to ride height should be producing an audible air pressure leak and noticeable lower reading on the front air gauge.

Freightliner help line .
1-800-385-4357
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