4.0L Engine

Remove the positive crankcase ventilation (PCV) hose

Fig 1: Removing Positive Crankcase Ventilation (PCV) Hose
Courtesy of MAZDA MOTORS CORP.
Remove the PCV valve from the valve cover

Fig 2: Removing PCV Valve From Valve Cover
Courtesy of MAZDA MOTORS CORP.
Disconnect the coolant hoses from the PCV valve

Fig 3: Disconnecting Coolant Hoses From PCV Valve
Courtesy of MAZDA MOTORS CORP.
To install, reverse the removal procedure