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1. #Coolant temperature sensor location manual install
2. #Coolant temperature sensor location manual full

As the coolant temperature changes, so does the resistance of the sensor. As the temperature increases, the electrical resistance of the sensor decreases. The sensors are a Negative Temperature Coefficient (NTC) type. The sending unit is a heat sensitive variable resistor that is located on or near to the cylinder head and threads into an engine coolant passage. The engine coolant temperature gauge uses a heat sensitive sending unit to transmit an electrical signal to the gauge. Because of the circuitry design on A3 vehicles, testing of the coolant temperature gauge is limited. A3 vehicles use a "variable voltage" type, where a voltage is supplied to the sensor. On A1 and A2 vehicles, the circuit is a "resistance to ground" type. As coolant temperature increases, the resistance of the sensor decreases or decreases, depending on the type of sensor.Ī1 and A2 platforms use a different type of circuit that A3 vehicles. The coolant temperature gauge sensor is a temperature-variable resistor, or thermistor. Connect the negative battery cable to the battery.įig.

#Coolant temperature sensor location manual install

Reverse the removal procedures to install the new part.You may need to partially drain the engine coolant to prevent coolant spillage. Replace with a new one and get back on the road in no time.Because ECT (engine coolant temperature) sensor procedures vary depending upon their location, first locate the part. Remove the lead coming from the terminal and loosen the sensor with a socket or wrench. Be sure the cooling system is not pressurized and cooled completely. Replacing the coolant temperature sensor is an easy process that anyone can do at home with some basic mechanic's tools. Step 5 - Replace Defective Coolant Temperature Sensor If not, then it is not working correctly. You should see a much lower reading on the ohm meter. You should have a reading of approximately 2000 ohms. Connect the black lead of the meter to the body of the cold sensor and the red to the terminal. If you have a new sensor on hand and want to check it, you can do this easy test. If you do not see anything that is more than 200 ohms in difference, the coolant temperature sensor is defective and will need to be replaced. You are looking for readings that are more than 200 ohms in variance between a cold and warm engine. While the engine is running you need to be continually checking the digital ohm meter.

#Coolant temperature sensor location manual full

Let the engine run for a full two minutes to allow the engine to get up to running temperature. Step 3 - Check Readingsįor the testing process you will need to turn the engine on. Before turning the meter on, set the digital reading to the 20K range. Next, remove the wire from sensor terminal and connect the red lead to the terminal end of the coolant temperature sensor. Connect the black lead of the digital ohm meter to a solid grounding. With the use of a digital volt-ohm meter you can easily tell if the sensor is faulty or not. Testing the coolant temperature sensor is a very quick process. This is your coolant temperature sensor.Ĭheck Out Coolant Sensors on Amazon Step 2 - Connect Digital Volt-Ohm Meter You will see a small terminal sticking out of the block with a wire lead coming from it. Look at the front of the engine block in the middle of the pulleys. You will search for the sensor within the engine block itself, using a drop light if you need help to see it better.

Pull the latch for the hood and open it, making sure it is secure before letting go. The coolant temperature sensor is located on the engine block under the hood.

Step 1 - Locate Coolant Temperature Sensor