Rear Air Ride Random Drops / Air Blending Door

[myrddin]

IC... so it could be that it needs the reprogram? I will call tomorrow and ask my local Hummer dealer... I know someone over there that might help.

I am pretty sure this is my compressor:

[Easy Ed]

Yup, I bet you are correct that it is what's in your truck.

Ed

[myrddin]

Any idea what all the reprogram does? Like is it a flash for other things as well or just specific to the compressor. My blend door was acting odd today as well, but after I messed with it a bit it started to work better... could have just been one of those days...

woke up and the back end was down, and then I for whatever reason tried the heat, and it was cold at 90 on driver side and hot on pass side... I switched it up and down and moved the heat to cold and back a few times and it seems OK I think for now... I will try it agn in the morning.

[myrddin]

Well my measurement shows it dropped almost 4 inches this morning... I don?t get it... The bags do show some cracking but no bubbles at all when I spray... I guess I am not sure what to do. I am going to take a measurement when I get to work... Ind another when I am done to see if I notice anything.

[myrddin]

When I got to work and parked it I measured about 40 1/4 on the driver side and about 40 3/4 on the passenger side... I will chk agn about 5:00 today when I am headed home. I just called the Hummer dealer and had him check the vin (he asked for last 8 digits) and he said it had no due recalls but would need to hook it up to the GM scan tool to see if it was at the latest revision of the software (he says that is all software on the truck). It will cost 97.00 for them to do that and that is even if it does have the latest code... so I will have to pay no matter what. That is almost one airbag... I wish I had a way to tell exactly what was the problem... I do not want to throw money out the window unless its for what needs to be replaced.

any ideas, is there something that will help me indicate what software is on the truck (like how the compressor acts or what something else does)... And is there anything else I can do to test the bags ot lines or compressor?

I would like some reassurance is all... I do not think its smart to just toss money at it till it is fixed.

[Scarsman]

I am not familiar with the air system, but if it adjusts itself automatically then ther must be a valve somewhere for letting air out. Could there be some dirt or something in the system causing the valve to nt quite seal every time, slowly letting air out? This could explain why it does not do it every time. If the lines and bags are not leaking, then that is all I can think of.

Just throwing out ideas.

[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.