Hummer H2 2010, Owner'S Manual

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The system is activated when the engine is started and
deactivated when the ignition is returned to OFF. The
engine must be running for the rear of the vehicle to be
raised and the doors must be closed to enable a
transition between Normal Ride Height and Extended
Ride Height.
The compressor may be heard while the system is
active and the release of air similar to a hissing sound
may also be heard. This is normal.
Load leveling will not function normally with the inflater
hose attached to the inflator outlet. Remove the hose
from the outlet when it is not in use. See
Accessory
Inflator on page 6 ‑ 82 .
Overload and Overheat Protection
Overload protection is designed to protect the air
suspension system and is an indication to the driver
that the vehicle is overloaded.
If the rear suspension remains at a low height, the rear
axle load has exceeded GAWR (Gross Axle Weight
Rating). When the overload protection mode is
activated, the compressor operates for about
30 seconds to one minute without raising the vehicle
depending on the amount of overload. This will continue
each time the ignition is turned on until the rear axle
load is reduced below GAWR. The system may
reactivate without cycling the ignition if some of the
excess load is removed.
If the total rear GAWR (Gross Axle Weight Rating) is
reached, the suspension may be slightly less than level.
This is normal and does not mean there is a problem
with the air suspension.
In some instances the compressor may stop working
due to being overheated. This is normal. In the instance
of an abnormal overheat condition though the
compressor will stop working and the SERVICE
SUSPENSION SYSTEM will be displayed on the DIC.
See
DIC Warnings and Messages on page 4 ‑ 52 for
more information.
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