17 00 009 Checking cooling system for water leaks
WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 2013 BMW 328xi, 2013 BMW 328i, 2012 BMW 328xi, 2012 BMW 328i, and 2011 BMW 328xi. However, it is still accessible from the selected car via links, so may be relevant.
- 17 0 101
- 17 0 113
- 17 0 114
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.
Checking pressure relief valve in cap:
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.