17 00 009 Checking cooling system for water leaks

WARNING: This page is about a different car, the 2003 BMW Z8, 2002 BMW Z8, 2001 BMW Z8, and 2000 BMW Z8. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

17 0 002
17 0 005
17 0 007
17 0 008

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

Checking pressure drop in cooling system:

Remove cap on expansion tank. Attach special tool 17 0 002 / 17 0 005.

Build up gauge pressure of 1.5 bar, wait approx. 2 minutes. Cooling system is impervious to leaks if pressure drop is max. 0.1 bar.

Fig 1: Identifying Special Tool

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Checking pressure relief valve in cap:

Detach rubber (1) from hand pump.

Attach special tool 17 0 007 / 17 0 008.

Fig 2: Detaching Rubber From Hand Pump

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Screw cap (1) onto special tool.

Fig 3: Screwing Cap Onto Special Tool

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Build up pressure with special tool (hand pump) 17 0 002;

observe pressure gauge to ascertain when opening pressure is achieved.

Compare opening pressure of pressure relief valve. Refer to 17 11 RADIATOR AND MOUNTING PARTS E52 / S62 .

Checking vacuum valve in cap

Screw cap (1) onto special tool 17 0 007 and connect to vacuum hose of vacuum pump.

Fig 4: Screwing Cap Onto Special Tool

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Sourcing reference: BMW Parts Service.

Feed vacuum pump with battery positive voltage. Slowly apply partial vacuum to cap.

Compare opening pressure of vacuum valve. Refer to 17 11 RADIATOR AND MOUNTING PARTS E52 / S62 .