GMC TopKick 2007 Owner's Manual page 279

Hood Inlet Seal
If your vehicle is being used in heavy snow
conditions or for snow plowing, there is a
possibility of snow and ice build up in the inlet to
the air cleaner, blocking airflow to the engine
and negatively impacting engine performance.
To prevent the blocking of air, remove the
hood inlet seal, by doing the following:
1. Loosen the clamp that holds the seal to the
air cleaner.
2. Slide Seal off.
3. Store the seal in the inlet, located on the
underside of the hood
4. Store the clamp on the coolant surge tank.
Pull the overflow tube out of the white
plastic retainer, slip the clamp over and
reinstall the hose.
The seal will need to be replaced on to the air
cleaner for normal driving, especially in the
warmer months.
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