![]() With that said, the coolant temperature sensor discussed in this post finds its way into many other Chevrolet, Buick and GMC truck engines. This includes the 4.8 L, 5.3 L and the 6.0 L workhorse engines. You'll need a 19 mm deep socket, but a 3/4 standard size also works.Īnother thing to mention, in this article we're concentrating on the Chevrolet V-8 engine. With the radiator cap removed it flows like a tidal wave. If you leave the radiator cap on it comes out slowly. Also remember if you do uninstall it that coolant will come out. Obviously, only remove the sensor on a cold engine. If you can find the number one spark plug boot you'll find the sending unit. In this article we'll talk about how to determine the coolant temperature sensor is actually the problem with the vehicle and not the other possibilities that exist.Ībove you'll see the component location diagram for the coolant sensor. Sensor, replacing the thermostat and water pump becomes a for sure waste However, if the failure is with the Chevrolet coolant temperature Especially since, problems with the water pump and finding it necessary to replace the thermostat on vehicles with over 100,000 miles remain a real possibility. It's easy to buy into this type of quick diagnosis. With that said, a quick search on the Internet might lead one to believe replacing the water pump will take car of the issue. This allows them to enjoy better reliability than the parts of the past. ![]() I think they improved the manufacturing process on these moving parts. However, it's usually on high mileage vehicles or ones with neglected coolant systems. Sure cars and trucks still need thermostats replaced once in a while. This was a common repair back in the day, but not any more. Retrieving this trouble code might lead you to believe it's time to replace the thermostat. That's the official definition from my OBD II diagnostic code book. The trouble code stands for coolant temperature below thermostat regulating temperature. The perfect example is when this part sets a code P0128 in memory. ![]() Start your car and allow it to run for a few minutes to ensure that the coolant temperature readings are authentic and that the engine is running efficiently.The Chevrolet coolant temperature sensor problem remains one of those issues that can mimic or lead you to believe other problems exist with the vehicle.Once you have verified that the wiring is accurate, reconnect the negative battery cable.The resistance values should correspond to the temperature of the engine coolant. Use a multimeter to test the sensor’s resistance and ensure that the wiring is accurate.Refer to the wiring picture for your specific sensor type to determine the correct wire links. Depending on the type of sensor, you may need to ground the sensor wire or connect it to a 1-wire and a reference voltage wire.The sensor is typically located on the engine block and is in contact with the engine coolant. Disconnect the black battery cable to prevent any electrical shocks or damage to the system.You can consult your car owner’s manual or a repair handbook to determine the type of sensor and its wiring diagram. Identify the type of coolant temperature sensor in your car.Related Post: Can A Bad Coolant Temp Sensor Cause Rough Idle, No-Start, Or Misfire Similarly, when the engine coolant temperature decreases, the sensor resistance also decreases, which sends low earth signal to the temperature gauge, and the indicator rests on the cool indication. When the temperature of the coolant increases, the resistance of the sensor decreases, which sends high earth 1-wire to the temperature gauge, and you see the temperature gauge indicator fully turned to the hot indication. Higher the temperature of the engine’s coolant, the lower the resistance of the ECT sensor, and vice versa. The coolant temp sensor provides an earth signal according to the temperature of the coolant. In three-wire coolant temp sensors, the ECU does not control the temperature gauge in the cluster. The two wires, a “5-volt reference”, and a “ground wire” go to the ECU, and the third wire “Earth 1-Wire for Temp Gauge” goes to the cluster-mounted temperature gauge by providing an earth link to the temperature gauge. Earth 1-Wire for Cluster-Mounted Temperature Gaugeģ-Wire-Coolant-Temperature-Sensor-Wiring-Diagram.A three-wire coolant temp sensor has the following three wires. The three-wire coolant temperature sensor is superseded by a two-wire coolant temp sensor. 3 Wire Coolant Temperature Sensor Wiring Diagram 3-Wire-Coolant-Temperature-Sensor-Wiring-Diagram
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