Ford P1904 OBD-II Trouble Code Definition: P1904 Engine coolant hydraulic blower motor solenoid – open circuit/short to earth P1904 Ford OBD-II Trouble CodeDescription: VAG OBD Trouble Code P1904 Engine coolant hydraulic blower motor solenoid – open circuit/short to earth Sorry no other information,Please help us to improve,Any information is appreciated.Thanks. […]