OEM Mercury Mariner Heater Core

Mercury Mariner Heater Core Parts and Q&A

• Heater Assembly
  6L8Z-18478-AA
  Q: How to service the heater core on Mercury Mariner?

  A:

  Service of the heater core begins by draining engine coolant and following it up with unclamping the two heater hoses from the heater core. Start by taking out the instrument panel before extracting both the screw along with the temperature blend door lever. The heater core can be removed when you firstlocate and remove its three cover screws and then the cover itself. The replacement of the temperature blend door lever needs correct positioning of both the temperature Blend Door Actuator and switch. The coolant hoses need plain water lubrication if you decide to proceed with lubrication. The installation ends by performing the reverse removal steps while filling and bleeding the engine cooling system. A leak test must occur first to check for heater core leakage when there are suspicions about leaks.
• Heater Core
  H2MZ-18476-M
  Q: How to Properly Maintain and Replace the Heater Core in a Mercury Mariner?

  A:

  Service of the heater core requires engine coolant drainage as the first step. Begin the heater core service by detaching both heater hoses from the heater core while releasing the clamps. First remove the instrument panel from the vehicle before disconnecting the temperature blend door lever and its screw. After screw removal of the heater core cover you should proceed to take out the three screws and the heater core cover to complete the heater core removal. Install the temperature Blend Door Actuator and switch in their proper positions then use plain water to lubricate coolant hoses as needed before attaching the temperature blend door lever. The installation requires following the opposite steps of removal and filling and bleeding the engine cooling system. A heater core leak test should be performed before removing the component.