My old P38's Air suspension seems to have a mind of its own..

1 She sits cock eyed at any height, much higher on the OS than the NS.

2 The compressor is running constantly, and gets so hot it can't be touched.

3 When using the height control button, when raising OR lowering the lights flash, and it takes forever to either deflate or inflate the bags..

4 If you set her in "wade" mode and then shut her off she'll lower down by quite a degree.

The odd thing is..

You can leave her a month on any setting and she won't sag, i don't think there is a leak,.

It's like she's constantly trying to self level..

Any ideas H

It's got a leak and the compressor is worn out.

Ahh right..

Would the leak be in the valveblock if it doesn't sag when stationary for a period of time?

She will rise quickly, but it seems to take a while for it to go up, the lights flash, then suddenly she shoots up/down.

The old bus had been sat for 1 1/2 years on the bump stops so i'll have to expect a few niggles, a good rebuild should see her good.

Thanks

H

Mine was a bit like that too. Now it's dead level, it'll still lift a fraction when I start off, but it's a uniform amount, so possibly the air bags are just all equally cooler after sitting overnight. The height sensors were working, but not all working the same IMHO, and so if they're not set up right you can get some self-levelling happening.
Quick build on the compressor, and then i made some calibration blocks for the "high setting" from a soft wood pole to put on each axle. Pull the high ride settings up on nano and write the settings back to the ECU. For the other ride heights then you will either need to make blocks for those heights too, or do the maths yourself and write the individual values to the ECU (I did the latter). I did run around spraying the EAS with washing up liquid - nada.

Haven't needed to touch it since

Always sitting cock-eyed is classic for a worn height sensor just btw

Wear doesn't matter as long as there are no dead spots in the track. Making some blocks and doing a full calibration will sort out a lean.