Lincoln Nautilus Manuals

Lincoln Nautilus: Climate Control System - General Information / Heater Core Leak Check. General Procedures


  1. NOTE: A coolant leak in the heater hose could follow the heater core tube to the heater core and appear as a leak in the heater core.

    Inspect for evidence of coolant leakage at the heater hose to heater core attachments.
  1. NOTE: Spring-type clamps are installed as original equipment. Installation and overtightening of nonspecified clamps can cause leakage at the heater hose connection and damage the heater core.

    Check the integrity of the heater hose clamps.
  1. Drain the coolant from the cooling system. Refer to Cooling System Draining, Filling, and Bleeding procedure in Group 303.
  1. Disconnect the heater hoses from the heater core.
  1. Install a short piece of heater hose, approximately 101 mm (4 in) long on each heater core tube.
  1. Fill the heater core and heater hoses with water and install the plug (221373) and the adapter (221374) from the Pressure Test Kit. Secure the heater hoses, plug and adapter with hose clamps.
  1. Attach the pump and gauge assembly from the Pressure Test Kit to the adapter.
    • Access the Pressure Test Kit Service Tools.
      Refer to: Climate Control Tools and Equipment (412-00 Climate Control System - General Information, General Procedures).
  1. Close the bleed valve at the base of the gauge. Pump 138 kPa (20 psi) of air pressure into the heater core.
  1. Observe the pressure gauge for a minimum of 3 minutes.
  1. If the pressure drops, check the heater hose connections to the heater core tubes for leaks. If the heater hoses do not leak, replace the heater core. Refer to the appropriate heater core removal and installation procedure in Group 412-00.

    Fluorescent Dye Leak Detection. General Procedures

    Leak detection Review next note for important refrigerant system dye information. NOTE: Fluorescent refrigerant system dye is added to the refrigerant system at the factory to assist in refrigerant system leak diagnosis using a Rotunda-approved UV lamp...

    Refrigerant Identification Testing. General Procedures

    Activation NOTE: Use Refrigerant Identification Equipment to identify gas samples taken directly from the refrigeration system or storage containers prior to recovering or charging the refrigerant system...

    Other information:

    Lincoln Nautilus 2018-2024 Service Manual: High Mounted Stoplamp. Removal and Installation

    Removal Remove the rear spoiler. Refer to: Rear Spoiler (501-08 Exterior Trim and Ornamentation, Removal and Installation). Remove the high mounted stoplamp. Disconnect the high mounted stoplamp electrical connector. Remove the retainers...

    Lincoln Nautilus 2018-2024 Service Manual: Climate Control System - Component Location. Description and Operation

    Item Description 1 Driver side register 2 In-vehicle temperature & humidity sensor 3 Sunload sensor 4 Passenger side register 5 HVAC control module 6 Center registers Item Description 1 Heater core 2 Driver side footwell air discharge temperature sensor 3 Evaporator temperature sensor 4 ..


    Opening and Closing the Hood

    Opening the Hood

    Lincoln Nautilus. Opening and Closing the Hood

    Inside the vehicle, pull the hood release handle located under the left-hand side of the instrument panel.

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