2008 GMC Yukon Owner's Manual - Page 111

Liftgate/Liftglass CAUTION: (Continued) {CAUTION: It can be dangerous to drive with the liftglass or liftgate open because carbon monoxide (CO) gas can come into your vehicle. You cannot see or smell CO. It can cause unconsciousness and even death. If you must drive with the liftglass or liftgate open, or if electrical wiring or other cable connections must pass through the seal between the body and the liftglass or liftgate: • Make sure all other windows are shut. • Turn the fan on your heating or cooling system to its highest speed with the recirculation mode off. That will force outside air into your vehicle. See Climate Control System on page 3-23 or Dual Automatic Climate Control System on page 3-26. CAUTION: (Continued) • If you have air outlets on or under the instrument panel, open them all the way. • If your vehicle has a power liftgate, disable the power liftgate function. See Engine Exhaust on page 2-47. If your vehicle has a power liftgate, see Power Liftgate on page 2-15. To unlock the liftgate, use the power door lock switch or press the door unlock button on the Remote Keyless Entry (RKE) transmitter twice. See Remote Keyless Entry (RKE) System Operation on page 2-5. 2-13