Genuine Ford Bronco II Coolant Temperature Sensor

Ford Bronco II Coolant Temperature Sensor Parts Questions & Answers

• Sender Assembly
  F2AZ-12A648-A
  Q: How to remove and install the engine coolant temperature sensor on Ford Bronco II?

  A: The engine coolant temperature sensor measures the temperature of the coolant and provides a signal to the PCM. When testing, disengage the wiring harness from this component and use an ohmmeter to measure its resistance. Enumerate readings obtained at both cold and hot states of the coolant on a graph. Replace it if they do not correlate with it. To remove or reinstall this part, first drain the coolant, then disconnect the battery and take off the sensor before reinstalling it again. Check for leakages after refilling it, add back water and start your car.
• Sender Assembly - Temperature
  F1SZ-10884-A
  Q: How to test and replace the coolant temperature sender on Ford Bronco II?

  A: The coolant temperature sender is located in the left, rear side of the engine, below the cylinder head for a 2.3L engine and on the top, left front of the engine, on the intake manifold for a 2.9L and 4.0L engine. Before removing the sender from the engine block and testing it, perform the tests to ensure that it is the sender malfunctioning, and not another part of the circuit. Remove the coolant temperature sender from the engine block. Attach an ohmmeter to the sender unit by attaching one lead to the metal body of the sender unit (near the sender unit's threads) and the other lead to the sender unit's wiring harness connector terminal. With the leads still attached, place the sender unit in a pot of cold water so that neither of the leads is immersed in the water. The portion of the sender unit which normally makes contact with the engine coolant should be submerged. Measure and note the resistance. Slowly heat the pot up (on the stove) to 19D-210°F(88-99°C) and observe the resistance of the sender unit. The resistance should evenly and steadily decrease as the water temperature increases. The resistance should not jump drastically or decrease erratically. If the sender unit did not function as described, replace the sender unit with a new one. 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 pressure, and released hot coolant or steam can cause severe burns. Disconnect the negative battery cable. Remove the radiator cap to relieve any system pressure. Disconnect the wiring at the sender. Remove the coolant temperature sender from the engine. 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). Attach the wiring to the sender and connect the negative battery cable. If necessary, add antifreeze to replace any lost coolant, then install the radiator cap.