This means that the air conditioning system refrigerant must be taken out before removing the intake manifold. Fuel pressure should then be relieved and the battery cable disconnected too. Engine cover, air filter housing and intake ducts must also be removed if necessary. Next are spark plug wires, throttle and cruise control cables, and coolant hoses. Electrical connectors from various components should be disconnected followed by removal of drive belts, power steering pump, alternator, and air conditioning compressor if it has one. PCV hose needs to be disconnected alongside vacuum lines as well as fuel delivery and return hoses. Non-turbo models need EGR pipe and valve to be removed as well as air assist injector solenoid valve while the turbo models require disconnection of throttle body connector, intercooler,oil flow control solenoid valveand vacuum hoses too. Finally,this is done to remove the intake manifold mounting bolts and lift away the manifold from the engine block.To install,clean up surfaces for mounting,new gaskets have to be used,and tight eningofbolts in steps.The fuel rail with injectors on it,the PCV valve hose,EGR supply pipe,wiring connectors,vacuum and fuel hoses cool ant,and radiator hoses,must all be attached;while accelerator able needs adjustment.Leaks are checked for before topping up coolant.For this work,turbo models will take their A/C systems to a specialized agency for service.