Checking Cooling System For Water Leaks

17 00 009 Checking cooling system for water leaks

Special tools required:
^ 170002
^ 170005
^ 170007
^ 170008

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 170002/ 17000/5.
Build up gauge pressure of 1.5 bar, wait approximately 2 minutes.
Cooling system is impervious to leaks if pressure drop is max. 0.1 bar.





Checking pressure relief valve in cap:





Detach rubber (1) from hand pump.
Attach special tool 17 0 007/ 17 0 008.

Screw cap (1) onto special tool.
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.

Checking vacuum valve in cap





Screw cap (1) onto special tool 17 0 007 and connect to vacuum hose of vacuum pump.
Sourcing reference: Refer to Part Supplier
Feed vacuum pump with battery positive voltage.
Slowly apply partial vacuum to cap.
Compare opening pressure of vacuum valve.