Question about 1998 Pontiac Sunfire

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Coolant wiring I just replaced the coolant sensor on my 98 pontiac sunfire. The temperature gage still doesn't work so we retested the code to make sure that it said the coolant sensor and it did. So we took out the sensor and had it checked and it is fine. I'm wondering where I can get wire for coolant sensor and how hard it is to install in the car as we figure it's a a short in the wire. Our next step is to take it to the dealer if we can't fix it with replacing the wire. Thanks

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Ensure you are checking the right sensor.
The coolant level sensor is usually located in the coolant resevoir. It generally performs a hi/lo monitor switch function.
The coolant temperature sensor is usually located on the motor (cylinder head or thereabouts). It is a variable resistor dependant on coolant temperature.
As a quick check to identify the sensor, with engine running, short the sensor to ground. If it's the temp gauge sensor the gauge will go max high. Open circuit connection = temp low.

Posted on Aug 01, 2009

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The sensor is threaded into the pipe shown below. Please let us know if you have more questions.


2.2L Engine

NOTE Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.

  1. Turn OFF the ignition.
  2. Drain the coolant system.
  3. Disconnect the Engine Coolant Temperature (ECT) sensor electrical connector.
  4. Carefully back out the ECT sensor.

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Fig. Coolant temperature sensor for the 2.2L Engine




To install:

  1. Coat the threads only with sealer P/N 9985253 or an equivalent.
    NOTE Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  2. Install the ECT sensor and tighten the ECT sensor to 18.5 ft. lbs. (25 Nm).
  3. Connect the ECT sensor electrical connector.
  4. Refill the engine coolant system.

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