Check

1 - Checking the circuit for leaks
Replace the expansion tank valve with adapter M.S. 554-01.
Connect tool M.S. 554-07 to it.
Warm up the engine, then stop it.
Pump to pressurize the circuit.
Stop pumping at 0.1 bar below the valve's opening pressure.
The pressure must not drop; otherwise, look for the leak.
Gradually unscrew the fitting of tool M.S. 554-07 to depressurize the cooling circuit, then remove tool M.S. 554-01 and refit the expansion tank valve fitted with a new gasket.
2 - Checking the valve opening pressure
Coolant passing through the expansion tank valve requires replacing it.
Fit tool M.S. 554-06 to pump M.S. 554-07 and place the valve to be checked on it.
Increase the pressure; it must stabilize at the valve's opening pressure, check tolerance ± 0.1 bar.
Valve opening pressure:


Test yourself
A quick Renault Kangoo quiz: every answer comes with an explanation and a link to the manual page.