I've never had the problem of the compressor running when it shouldn't (only the problem of the air not releasing), but looking at the wiring diagram, it seems to me that an air leak, by itself, should not cause the compressor to run on a parked car.

I could see how an air leak, combined with a faulty ride height sensor could do it. My understanding is that with the car on level ground and empty (no people, or cargo) there should not be any air preasure required in the system for the car to sit at the proper ride height, so the compressor should never need to run. But I could see that if there is something wrong with the ride height (i.e. rear springs "worn" from age/use) or ride height sensor faulty or out of ajustment, that it could trigger the compressor to try to level the car. When the sensor thinks the car is level, the compressor would stop, but then if there'* a leak in the system, the air would slowly bleed, the rear would drop,and eventually the sensor would think the car needs to be leveled again, and restart the compressor. Could this be what'* happening?

It could be. If you have something in the trunk the system needs more pressure to keep the rear of the car at the correct height.

I'm not sure where the car would sit if there was no pressure in the struts. It may sit low.

I think they might have changed the system in later years? The compressor never turns on with my car unless the ignition is on.. most of the time right when I flip the ignition switch for the first time of the day, the compressor will turn on for about 3 seconds.. other than that, it has NEVER turned on with teh car off..

is there an RPO code for this feature?

my compressor will come on without the key in the ignition but only if weight is applied to the car. Like my 370 lb father-in-law, who sat on the back of my car when the trunk was up, that was FUNNY! he sat on it and it musta went down half a foot, then brrrrrrrrmmmm,, the compressor kicked in and brought him back to original height. he was like "what the f*** was that???" :P

Mine always comes on when I jack up the front end (car is off).

My '87 bonnie must have this because i know that it was at least an option (if not standard) on these bonnevilles and i have the Auto Level fuse in my fuse box (and it holds fuses too, i.e. it must be there) but I haven't heard that pump activate ever! Does the shock absorver have to be a special one made for cars with auto level or do most shocks have the little nipple where it intakes air from?

and where do I find the ride height sensor(*) on my car. I'm wondering why my whole system doesn't work. I know i have an '87 and i'm in '92 and up territory but I'd be glad to hear where you alls 92s and up have the sensors (probably similar to mine anyways).
Thanks
Mike D
1987 Bonneville

I believe the sensor is attached to one of the rear control arms. It is a little box or disc with a little arm that comes out and connects to the rear suspension.

I believe the RPO code is G67, but mine (and I bet most) bonny'* that have this feature won't have this RPO, because I bet most have this because they're SSE'* or SSEi'*, and it'* a standard feature for those models.

yes, the sensor is on the rear passenger control arm and frame. The sensor itself is mounted to the rear frame and has an arm assembly that is attached to the rear control arm. When the sensor is moved due to height discrepancies... the compressor kicks in. Mine works with the key out of the ignition, but only when weight is added. I have also manually adjusted the sensor to get about 6" of rear lift... makes the bonne look like a dragster


Lee