AutoZone | Repair Guides | Engine Cooling | Coolant Temperature Sensor | Removal & Installation | AutoZone.com

Search suggestions

    My Vehicles

    Add a Vehicle

    Find a Store

    Select Store

    GET A $25 GIFT CARD FOR EVERY $100 SPENT ON ONLINE SHIP TO HOME ORDERS.

    Use Code: SALE25

    See Details

    Lincoln Aviator, Ford Explorer, Exp Sport, Exp Sport-Trac, Mercury Mountaineer 2000-2005

    Removal & Installation

    Print

    The coolant temperature sender is located in the following positions:



    4.0L engines-top front of the engine, on the intake manifold
     
    4.6L engines-on front of engine next to alternator
     
    5.0L engine-top front of the engine, on the left-hand side of the camshaft synchronizer
     


    CAUTION
    Ensure that the engine is cold prior to opening the cooling system or removing the sender from the engine. The cooling system on a hot engine is under high pressures, and released hot coolant or steam can cause severe burns.

    1. Disconnect the negative battery cable.
    2.  
    3. Remove the radiator cap to relieve any system pressure.
      NOTE
      On some 4.0L SOHC engines it may be necessary to remove the thermostat housing.



      Click image to see an enlarged view

      Fig. The sending unit uses a push-on wire connector. To remove, simply pull straight up from the sender

    4.  
    5. Disconnect the wiring at the sender.
    6.  
    7. Remove the coolant temperature sender from the engine.
    8.  

    To install:

    1. Coat the threads on the sender with Teflon®tape or electrically conductive sealer, then install the sender. Tighten the sender to 107-143 inch lbs. (12-16 Nm).
    2.  
    3. Attach the wiring to the sender and connect the negative battery cable.
    4.  
    5. If necessary, add antifreeze to replace any lost coolant, then install the radiator cap.
    6.  


    CAUTION
    Ensure that the engine is cold prior to opening the cooling system or removing the sender from the engine. The cooling system on a hot engine is under high pressures, and released hot coolant or steam can cause severe burns.

    1. With the vehicle in NEUTRAL, position it on a hoist.
    2.  
    3. Remove the RF fender splash shield by carefully removing the pin retainers and screws.
    4.  
    5. Remove the front Y-pipe by disconnecting the pipe at the exhaust manifolds and from the muffler.
    6.  
    7. Disconnect the Cylinder Head Temperature (CHT) sensor electrical connector.
    8.  
    9. Remove the CHT sensor.

      Click image to see an enlarged view

      Fig. Showing the location of the Cylinder Head Temperature (CHT) sensor-2005 Aviator

    10.  

    To install:

    1. Install the CHT sensor. Tighten it to 19 ft. lbs. (26 Nm).
    2.  
    3. Connect the sensor electrical connector.
    4.  
    5. Install the Y-pipe. Install new nuts and tighten all nuts to 30 ft. lbs. (40 Nm).
    6.  
    7. Install the RF fender splash shield. Replace any broken pin retainers.
    8.  
    9. Lower the vehicle.
    10.  


    NOTE
    The 4.0L engine use only an Engine Coolant Temperature (ECT) sensor, which is part of the electronic engine control system. Refer to -ENGINE PERFORMANCE COMPONENTS- section.


    NOTE
    Ford refers to the coolant temperature sensor described below as a Cylinder Head Temperature (CHT) sensor.

    4.0L (VIN E, K) SOHC Engine



    1. Disconnect the negative battery cable.
    2.  
    3. Drain the cooling system.
    4.  
    5. Disconnect the Engine Coolant Temperature (ECT) sensor electrical connector.
    6.  
    7. Remove the clip and the ECT sensor.
    8.  
    9. Installation is the reverse of the removal procedure.
    10.  

    4.6L Engines




    CAUTION
    Ensure that the engine is cold prior to opening the cooling system or removing the sender from the engine. The cooling system on a hot engine is under high pressures, and released hot coolant or steam can cause severe burns.

    1. Disconnect the negative battery cable.
    2.  
    3. Remove the alternator.
    4.  
    5. Disconnect the Cylinder Head Temperature (CHT) sensor electrical connector.
    6.  
    7. Remove the coolant temperature sender from the engine cylinder head.
    8.  

    To install:

    1. Install the sender. Tighten the sender to 19 ft. lbs. (26 Nm).
    2.  
    3. Connect the sender electrical connector.
    4.  
    5. Install the alternator.
    6.  
    7. Connect the negative battery cable.

      Click image to see an enlarged view

      Fig. Showing the location of the Cylinder Head Temperature (CHT) sensor (2) and the electrical connector (1)-2005 Explorer And Mountaineer with 4.6L engine

    8.  

     
    AutoZone Logo