BMW X5 Owners & Service Manuals

BMW X5: Radiator, Expansion Tank

CHECKING COOLING SYSTEM FOR WATER LEAKS

Special tools required:

WARNING: Danger of scalding! Only perform this work after engine has cooled down.

Checking pressure drop in cooling system:

Open cap on coolant expansion tank. Fit special tools 17 0 101 / 17 0 113.

Build up gauge pressure, wait approx. 2 minutes.

Cooling system is impervious to leaks if pressure drop is max. 0.1 bar.

Radiator, Expansion Tank
Fig. 8: Identifying Special Tools (17 0 101) And (17 0 113)

NOTE: While the vehicle is driven at high outside temperatures, the design may cause the pressure relief valve in the cap to open slightly and air together with dissolved coolant to escape. This coolant vapor condenses on the surface of the expansion tank and leaves traces when the vehicle has cooled down. These traces do not indicate whether the cap is defective or not. When the vehicle has been parked up for an extended period of time, the residual escaping coolant can cause the pressure relief valve in the cap to stick; therefore check the cap again 2 to 3 times.

Replace the cap only after you have checked three times and there is an incorrect opening pressure.

Checking pressure relief valve in cap:

Screw cap (1) onto special tool 17 0 114. Build up pressure with special tool (hand pump) 17 0 101; observe pressure gauge to ascertain when opening pressure is achieved.

Compare opening pressure of pressure relief valve.

Radiator, Expansion Tank
Fig. 9: Identifying Screw Cap On Special Tool (17 0 114)

READ NEXT:

 Engine Radiator

 Removing And Installing Radiator (N52K)

WARNING: Danger of scalding! Only perform this work after engine has cooled down. IMPORTANT: Wear protective goggles and gloves. Necessary preliminary tasks: Follow instructions for working on cooli

 Removing And Installing/Replacing Thermostat Cartridge (N62TU/N52K)

IMPORTANT: Danger of scalding! Only perform this work after engine has cooled down. Necessary preliminary tasks: Follow instructions for working on cooling system. Draining coolant. Remove fan c

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 Replacing Front Axle Carrier

WARNING: Danger to life! Mount securing fixture for vehicle on lifting platform to prevent the vehicle from slipping off or tilting down. Secure engine in installation position to prevent it from falling down. Necessary preliminary tasks: Lower front axle support. Remove both lower control arms

 Contents Of Body, General

General information -> Quality standard. -> Workshop equipment. Safety regulations -> Safety at work. -> Information on hazards. -> Information on vehicle protection. Materials -> Materials science. -> Use of materials in outer shell. Handling electrical/electronic equipment, ai

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