[Archived]

You don’t have an Aux air compressor built into your bus already?

[Dan]

Hi Mike,

There is an Auxiliary Air tank on our 2003 Liberty XLII Classic. However, it is buried behind the walls of the 2nd Passenger-side Entertainment Center bay (along with the bedroom and Starboard Cruisair units).

Besides being a pain to access…I thought you had to start the Coach in order to run the Aux Air compressor and Fast Idle?
My understanding is that it is extremely hard on the DD60 to cold start and just run it long enough to air up (besides all the diesel it burns).

Just looking for a better option that doesn’t require cold starting the engine? (FYI – we end up having to air the front of the Coach up in large part because of the slant of the paver lot at Pelican Lake …dips down significantly, since we can get 68+ inches of rain annually! And secondly, because the PVC waste hose connector needs replaced with a 90 degree piece. The one that was installed by the dealer (during Covid) sticks almost straight down – and, if the bus loses air in the back it would crack/crush the connector and hose).

My thought is that if I get a separate (electric) compressor, it can be plugged into a 110V outlet and do the same job as the Coach’s Aux Air tank – without needing to cold start the engine.

What I don’t know yet is how to get it to operate the correct Norgren valve(s) to air up the front end on both sides?

[Paul]

I think you are missing something here. Maybe the Liberty folks can chime in, you should have an on board 12 VDC or 110 VAC compressor that can be used for things like this. Call the folks where you bought and ask them where the switch is.

[DON]

Winterstorm, Liberty installed a 110vac aux compressor to do exactly what you’re asking. It is powered thru your inverter(s). Be aware the more you use it the more often you’ll need to drain the water collected in the air/water separator(s). Moisture in the air system is destructive.

If you use another source of aux air, that air will need to be dried out before entering the bus air system.

Fix your front air leak.

[Archived]

Thank you, Don and Mike.

We’ll make finding and fixing the front leak a priority!
Just had the Aux air tank drained last month but, will check again.

Thank you for the great and useful advice!

[joel]

On my bus, the fitting in the back engine bay is before the AD-2 dryer. The one in the steer bay runs thru a water filter before entering the tank.

---

1999 XLV X-6872,  liberty #440

[gordon]

Downstream of my aux compressor in the steer compartment, Liberty put 1 air/water separator, I added the second.

Then downstream from them I added a AquaChek ACK 10 to remove more moisture.

I never get any moisture from the tanks under the bus because the air dryer(s) and filter(s) are maintained so they function properly.

[gordon]

The breaker (switch) for my 110 volt aux air compressor is the bottom one on the main electrical panel inside the bus. The original compressor was mounted near the aux air tank.

[Archived]

My aux air compressor breaker switch is located where yours is, last on the left. #2 inverter powers it.

My aux compressor is in an enclosure on the back wall of the steer compartment. The air from it flows thru the water traps/separators then to the main aux tank that is nearby just outside the steer compartment.

There are 4 ways to put air into my aux system; 1) engine driven compressor; 2) fill fitting in back curbside engine compartment; 3) fill fitting inside steer compartment; 4) aux compressor. Each has at least 1 water trap/filter/separator to keep the water out.

[DON]

Outstanding info, Don! Thank you.

The hunt begins!