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Home >> Volvo >> 2008 >> V70 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Module (ECM) - Vehicle Communication Information >> Vehicle Communication Information, Engine Control Module (ECM) (B6304T2; 2008-09) >> Description Of Activations >> Component/Function >> Relief Valve (Off/On)

Relief Valve (Off/On)

The valve opens using the start button and closes using the stop button.

A weak sound can be heard from the valve.