Hummer 2003 H2 Owner's Manual page 261

Q:
Are there some things I should not do when
driving down a hill?
A:
Yes! These are important because if you ignore
them you could lose control and have a serious
accident.
D
When driving downhill, avoid turns that take you
across the incline of the hill. A hill that's not too
steep to drive down may be too steep to drive across.
You could roll over if you don't drive straight down.
D
Never go downhill with the transmission in
NEUTRAL (N). This is called "free
Your brakes will have to do all the work and could
overheat and fade.
Q:
A:
D
Stop your vehicle by applying the regular brakes.
Apply the parking brake.
D
Shift to PARK (P) and, while still braking, restart
the engine.
D
Shift back to a low gear, release the parking brake,
and drive straight down.
D
If the engine won't start, get out and get help.
-
wheeling."
Am I likely to stall when going downhill?
It's much more likely to happen going uphill. But if
it happens going downhill, here's what to do.
4-33