Ford F-150, F-250, Expedition, Lincoln Navigator Repair Manual 1997-2009

• Ford F-150 1997-2003
• Ford F-150 Heritage 2004
• Ford F-250 1997-1999
• Ford Expedition 1997-2009
• Lincoln Navigator 1998-2009

The cooling system consists of a radiator and coolant reserve system, a radiator pressure cap, a thermostat, a cooling fan, and a pulley/belt-driven water pump.

The radiator cooling fan is mounted on the front of the water pump. The fan incorporates a fluid-drive fan clutch, which saves horsepower and reduces noise. When the engine is cold, the fluid in the clutch offers little resistance and allows the fan to freewheel. As the engine heats up and reaches a predetermined temperature, the fluid in the clutch thickens and drives the fan.

The recovery tank is called a "degas" bottle, and it functions somewhat differently than traditional recovery (or overflow) tanks. Designed to separate any trapped air in the coolant, it is pressurized by the radiator and has a pressure cap on top (the radiator on these models has no cap at all).

When the engine's thermostat is closed, no coolant flows in the degas bottle, but when the engine is fully warmed up, coolant flows from the top of the radiator through a small hose that enters the top of the degas bottle. There, air separates and coolant falls to the approximately one quart coolant reserve in the bottle, which is fed to the cooling system through a larger hose connected to the lower radiator hose.

Unlike traditional coolant recovery tanks, the cap on the degas bottle should never be opened when the engine is warm, since there is a danger of injury from steam or scalding coolant (see the Warning in Section 5).

• Tune-up and routine maintenance
• 4.2L V6 engine
• 4.6L and 5.4L SOHC V8 engines
• General engine overhaul procedures
• Cooling, heating and air-conditioning systems
• Fuel and exhaust systems
• Engine electrical systems
• Emissions and engine control systems
• 5-speed manual transmission (M50D)
• 4-speed automatic transmission (4R70W, E40D, 4R100)
• 5-speed automatic transmission (2005 and later Expedition, Navigator)
• Transfer case - Borg-Warner 44-06 (manual and electric shift)
• Clutch and driveline
• Brakes
• Suspension and steering systems
• Body
• Chassis electrical system
• Wiring diagrams