Checking Cooling System For Water Leaks
CHECKING COOLING SYSTEM FOR WATER LEAKSWarning!
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.
Generate gauge pressure of 1.5 bar. Wait approx. 2 minutes.
Cooling system is impervious to leaks if pressure drop is max. 0.1 bar.
Checking pressure relief valve in cap:
Screw cap (1) onto special tool 17 0 007.
Connect hand filling gauge to special tool 17 0 007.
Slowly pressurize special tool with compressed air.
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.
Feed vacuum pump with battery positive voltage.
Slowly apply partial vacuum to cap.
Compare opening pressure of vacuum valve.