Foretravel Owners' Forum For owners and Fans of Foretravel Motorcoaches September 16, 2025 ...

After the coach levels I switch off the HWH auto level because of problems. 

1.  After the coach levels I switch off the HWH auto level because of problems.
2.  The coach loses air ever so slowly from the two air springs straddling the driver's/street side drive axle.
3.  When air leaks out of these bags the auto level will expel air on the opposite side of the rig to try and maintain level.
4.  The auto level will do this until there is no more air to expel and then the rig will be out of level.

I so want to try a ultrasonic leak detector for internal leaks, six packs and safety valves
Scott

I have purchased the Amprobe ULD405 Ultra sonic leak detector.  I have a leaking exhaust passenger side tag valve.  Coaches with Active Air have pressure gauges so you can see the pressure at each locations. You can watch the dash display and it will show all of the pressures. If one is leaking you can see the location value either go up or down.  Since owning the IH45 I have see valves leaking both ways.  The tag will go from 70 psi - 0 about 1 psi per maybe 5 seconds when you have system inactive.  I have gone under with meter, cone on and the meter is not detecting any leak.  I have even put it up close to the air exhaust muffler and does not detect anything.

When I am looking for air leaks I have to turn inverters off and unplug coach. The chargers/inverters make the detector go nuts.

Unfortunately doing this myself is beyond my skillset.  I'm hoping we can have them repaired when we visit Nac next week.  One other comment.  Out HWH leveling system is not OCD about being exactly level.  When I compare the HWH level to a spirit level laid on the floor, the bubbles are not exactly centered.  I fine tune the HWH level to center the bubbles and all is well until the coach air system leaks down enough to activate the HWH system.  The HWH system then re-levels but just enough to get the bubbles between the lines on a spirit level, but not centered.  With our coach floor plan we have a hinged door to the private toilet room.  If we are just the slightest bit out of level the door will swing one way or the other. 

You can adjust what the computer thinks is level with the 4-way mercury switch that's likely under the bump-out part of your kitchen counter.

Before you take it to MOT I recommend calling and asking how they handle that situation...they may not be willing to rebuild and may force you into new solenoids and/or manifold instead. My new manifold with 6 new solenoids was $1600 when I bought it from HWH... probably  more from MOT.

One of the problems was a valve that's connected to the Thomas air compressor pump assembly.  The tech suggested removing it since it wasn't needed.  There is a switch next to driver's seat "Air Tank" that controlled this valve. 

After this maintenance I found the Thomas pump only runs when we operate the slides.  It rarely comes on any other time.   

While traveling thousands of miles around the western US this past year I noted the air leak down problem on the driver's side rear bags. When we parked I would use the auto level.  The driver side would ever so slowly leak and the HWH system would expel air from the curbside to compensate.  When all the air on the curbside had been expelled the HWH system would not pump up the driver side.

Michelle, the air tank switch that opens a solenoid valve that I had removed  allowing the aux compressor to feed the main tanks - not sure why one would want to air up the main air tanks without the engine on and not sure the Thomas pump is powerful enough to accomplish this task.  The pump instructions say the pump should not be run continuously for more than six minutes, then rested for a period of time.  Wouldn't want to rely on this procedure for the coach brakes if I'm having the coach towed.