Checking cooling system for watertightness
WARNING:
Hot surfaces.
Risk of burning!
Risk of burning!
- Perform all work only on components that have cooled down.
- Open sealing cap (1).
- Mount the special tool 0 494 418 (17 0 101) with the special tool 0 494 419 (17 0 102) and special tool 0 494 642 (17 0113) from the special tool set 0 494 417 (17 0 100) on the coolant expansion tank.
- Build up excess pressure and wait for approximately 2 minutes.TECHNICAL DATA - COOLING SYSTEM TEST PRESSURE SPECIFICATION
Cooling system test pressure Test pressure for cooling system (gauge pressure) 1.5 bar NOTE: TECHNICAL INFORMATION
If the described test step is not completed successfully: repeat test step twice. Only replace the sealing cap after three tests with an incorrect opening pressure.
When driving at high ambient temperatures, the design may cause the pressure relief valve in the sealing cap to open slightly and air to leakage together with dissolved coolant. This coolant vapor condenses on the surface of the coolant expansion tank and leaves traces of coolant when the vehicle has cooled down. These traces of coolant do not indicate whether the sealing cap is defective or not.
Leakage coolant vapors when the vehicle is at standstill may cause the pressure relief valve to stick to the sealing cap. This may cause an incorrect opening pressure. - Screw on sealing cap (1) on special tool 0 494 643 (17 0114) from the set of special tools 0 494 417 (17 0 100).
- Build up the pressure with the special tool 0 494 418 (17 0 101) and the special tool 0 494 419 (17 0 102) from the special tool set 0 494 417 (17 0 100).
- Observe on the pressure tester when the opening pressure has been reached.TECHNICAL DATA - PRESSURE SPECIFICATION
Opening pressure of coolant seal cover Pressure relief valve opens when the pressure exceeds the ambient pressure. min. 2.0 bar Electric changeover valve must open at latest when the pressure is lower than the ambient pressure max. 0.1 bar - Close sealing cap (1).
- Close the sealing cap (1) until the arrows
align.
