2008 GMC Sierra 1500 Pickup Owner's Manual - Page 271

The following steps must be performed on the bolts and snap features to remove the air dam: 1. Remove the two outboard air dam bolts. 2. With a flat-blade screwdriver, push down on the snap features and disengage the snaps. 3. After the bolts are removed and the snaps are disengaged, push forward on the air dam until it is free. When you are back on roads, though, be sure to replace the air dam. Notice: Operating your vehicle for extended periods without the front fascia lower air dam installed can cause improper air flow to the engine. Always be sure to replace the front fascia air dam when you are finished off-road driving. To reinstall the lower air dam do the following: 1. Line up the snap features and push the air dam rearward to engage the snaps. 2. Install the two outboard bolts. Before You Go Off-Roading There are some things to do before you go out. For example, be sure to have all necessary maintenance and service work done. Check to make sure all underbody shields, if the vehicle has them, are properly attached. Is there enough fuel? Is the spare tire fully inflated? Are the fluid levels up where they should be? What are the local laws that apply to off-roading where you will be driving? If you do not know, you should check with law enforcement people in the area. Will you be on someone's private land? If so, be sure to get the necessary permission. 4-13