Rear Air Ride Random Drops / Air Blending Door

[HUMTECH]

Here are the symtoms fo the recalibration issue.
Some customers may comment on a Service Air Suspension message and/or a clicking noise from the rear of the vehicle when the vehicle is shut off and the key is removed from the ignition and/or the ECAS compressor cycles too frequently while the vehicle is running. Also could be opening and closing the exhaust valve letting air out of the system.

[myrddin]

thnx HUMTECH... I will start to pay attention... I do know that it will level its self out when I stop and go, or if I get out with it running... and it will go threw and raise and then it will lower until its where it wants to be... but I do not think it runs at all when you turn the key off... or at least not that i have ever seen?


I will tell you this (for the record so far)
at 2:36 today I measured Pass - 40 3/4 and the driver was 41 3/4

I will measure it agn before I drive home.

[myrddin]

Checked when I got out of work was the same as 2:30 ( Pass - 40 3/4 and the driver was 41 3/4)

Checked after my drive home:
Driver - 41 1/2
Passenger - 41

I guess I will chk it later tonight. I dont know what to do at this point.

[Easy Ed]

Hate to say it but ya just got to let them run the scan tool on it, check for any codes and check the software for any updates. They may even be able to tell you what is wrong with the heater/ac problem also while doing the scan. It is a painfull thing to pay for but no a days it is the only way to keep from throwing money at it hoping to find the problem. I have a power programmer that will also read the codes and clear them and point me in the correct direction to fix most things, it helped me when the memory module went bad in the drivers seat.

HUMTECH is a great person that takes the time to help us out here but I think he will agree that checking for codes and the software version is a good thing at this point to help resolve your problems.

Agreed HUMTECH ??

Ed

[HUMTECH]

Absolutley i agree. Software problems can be impossible to diagnose you just kinda have to put faith in the writers. I fix probably 2 to 4 problems a week on average with software updates. Sometimes just reloading the current software can fix an issue just like restarting a pc or reinstalling software on a pc to correct for some glitches. Thanks for the kudos Ed...

[HUMTECH]

Also if there was a level sensor replaced the ride height calibration needed to be done, if not that will cause issues as well. The dealer can check in the data list if it is learned or not. another thing to check to get your moneys worth

[Easy Ed]

You are welcome. Just giving credit where credit is due

Originally Posted by HUMTECH

Thanks for the kudos Ed...

[myrddin]

I understand... I just don’t get how the software can let the rear drop over time like that... Seems like I could hear it or something...

Currently at: This is as of 8:25pm...
Passenger 40 3/4 best I can tell
Driver 41 1/2 (-2 mm)


So let’s look at it like this, its dropping, so air is coming out of something... Is there an exhaust valve that has a vent for the air? Would it be dumb to try to put a balloon over it to see it shows signs or air escaping?

What if it’s a leak somewhere I can’t see to spray?

Man, it’s bad enough when you need to work on something but usually you know what it is.


The air is currently working, it was just the one time... but like you stated... could be sign of what is to come.

If you guys say its worth my time then I will do it... I just wish I had more signs to point my finger at is all.

I did find this and I am not real sure what it means (like what had to be fixed) but:
Suspension & Steering: SUSPENSION:REAR
Service Bulletin Number: 3472
NHTSA Number: 10014856
Model Years Affected: 2003, 2004, 2005
Date of Bulletin: 05/2005
Bulletin Summary: REAR END OF THE VEHICLE APPEARS TO SAG AFTER THE VEHICLE SITS OVERNIGHT OR LONGER.

located: http://repairpal.com/hummer-h2-2003/recalls_and_tsbs