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How to replace the engine coolant temperature - ECT - sensor on a Windstar?


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January 07, 2010 7:07PM

Engine Cooling Fan Fuses/Relays

1995-1998 Engine compartment fusebox # B & H

1999-2003 Engine compartment fusebox - Fuse #107 and relays #301 & 303

The engine coolant temperature (ECT) sensor is threaded into the top left-side of the engine, in the intake manifold (right behind the oil filler cap.)

The steps to replacing are:

  1. Partially drain the engine cooling system until the coolant level is below the ECT sensor mounting hole.
  2. Disconnect the negative battery cable.
  3. Disconnect the wiring harness from the ECT sensor.
  4. Remove the coolant temperature sensor from the intake manifold.

To install:

  1. Coat the sensor threads with TeflonĀ® sealant.
  2. Install the sensor into the intake manifold and torque to 71-115 inch lbs
  3. Connect the negative battery cable.
  4. Refill the engine cooling system.
  5. Start the engine and check for coolant leaks. Top off the cooling system

It should be located on or near the waterneck. The waterneck is where your thermostat is contained. It could also be tapped into your head (likely Bank 1, which is the side next to the firewall). If it is in the head you will likely find it on the end of the head. Remember to use a small amount of teflon tape on the threads of the new switch.

it is under the intake manifold hose where it attaches to the throttle body
The engine fans are protected by relays in the engine compartment power / fusebox.

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