2004 Ford F150 Owner Guide 5th Printing - Page 159

Driving Always set the parking brake fully and make sure the gearshift is latched in P (Park). Turn the ignition to the LOCK position and remove the key whenever you leave your vehicle. If the parking brake is fully released, but the brake warning lamp remains illuminated, the brakes may not be working properly. See your dealer or a qualified service technician. Understanding the gearshift positions of the 4-speed automatic transmission Your vehicle's automatic transmission is equipped with a special shift strategy that insures maximum heater performance during cold weather operation. When ambient temperature is 23°F (-5°C) or below and the engine coolant temperature is below 100°F (38°C), light throttle upshifts may be slightly delayed. Once the engine coolant temperature reaches 160°F (71°C) the normal shift strategy will resume. This is normal operation and will not affect the function or the durability of the transmission. If the normal shift strategy does not resume once the engine coolant temperature reaches the normal operating temperature, or if the downshifts and other throttle conditions do not function normally, see your dealer or a qualified service technician as soon as possible. P (Park) This position locks the transmission and prevents the rear wheels from turning. 159 2004 F150 (f12) Owners Guide (post-2002-fmt) USA English (fus)