My 2001 U295 leaks down on the left front overnight. No obvious leaks in the airbags or hoses. The aux level pump comes on but the coach will not level until the ignition key is turned on. My thought is that something is leaking internally. The dash gauges show only a few pounds pressure drop. Any suggestions on where to look?
Rebuild the six-pack.using kit from Tom McCloud that posts here.
Swap the front dump solenoid valves if the problem follows the valve you found it.
At least you can eliminate the valve.
Thanks guys. I'll post the results
UPDATE: Rebuilt the 6 pack using Tom's kit. Smooth procedure, sonic cleaned all the parts. Double checked all the wiring connections with my labeling and the harness labels. Coach still lays down on the left front overnight, and now raises on the RF. We are looking at 1 1/2" droop LF and 1 1/2" raise RF. Turn the ignition switch on and the coach levels. My understanding is the solenoids are normally closed. If this is correct, the RF raise solenoid is getting power when the system is off. Do I understand that correctly?
RF Raise solenoid is leaking.
If the RF raise is leaking, I can deal with that. What is causing the LF to lower? Leaking a different way?
A different one is leaking.
Is the left side leaking down or is the right side going higher throwing more weight on it ?
I say again swap the suspected solenoid with the one on the other side and see what happens.
Swapped solenoids. Still getting 1 1/2 raise RF; 1 1/2 lower LF.
I'm not at all familiar with this air suspension setup. What comes into play when the ignition switch is turned on that causes the coach to level itself
Just to confirm that you swapped the bottom two solenoids? If so you have eliminated the solenoid valves.
Are you sure you didn't get an air hose or any wiring crossed during the manifold change.
If you had a raise solenoid powered when it shouldn't be powered you would see the coach go up in a matter of seconds (as long as you have normal pressure in the air tanks) not over night. Over night would be a leak.
Keep looking, you will find it.
If swapping the solenoids didn't change anything and you are in level mode then I wonder if you have a level sensor or computer problem.
That sensor sits on springs. I would gently move it a little to be sure it's free.
What level lights on the HWH control panel are on when you level the coach?
I think it goes to travel height when you turn the key(start?) on.
Now the ride height control valves control the height.
Do you get the green travel light when you turn the key on? If so it goes to travel height, it's not leveling the coach.
Two systems here:
Travel when the green travel light is on.
Top two solenoids.
When you select level it uses the level sensor and the middle (dump) solenoids and or the bottom (raise) solenoids
Only one system at a time will work.
when you turn the ignition on, the coach may automatically go into "travel" mode. At this point the computer/level sensor is no longer attempting to level the coach. Instead, that job is handed off to ride height control valves. You have three. There is a mechanical linkage between the valve and [essentially] your axles. If they extend too far away from the valve it exhausts air, if it gets too close, it lets air into to the airbags.
You only have one of these valves in the front and it is at the center of the axle. So the best it can do is try to average of two sides to roughly 8.5". Because of this, if you are on even slightly uneven ground, you can see an offset between the left and right front corners. It's normal and you would hardly be the first to chase a red herring because of it.
Each corner in the back has its own ride height control valve and are therefor more precise so those should always be almost exactly 8.25" between the bag plates. Much of your side to side adjustment upfront actually comes from the back.
Again, this is only true for when you are in travel mode. Once you go into manual or auto leveling mode, these ride height control valves are taken out of play.
It is an exercise in futility to try to troubleshoot an unlevel front end, while in travel mode, if you are not on perfectly level ground