![]() Connect electrical connector (2) to ECT sensor (3). Tighten sensor to 11 Nm (97.3 inch lbs.) torque.Ĥ. Apply thread sealant to sensor threads.ģ. Disconnect electrical connector (2) from sensor (3).ĥ. Temporarily supportĬompressor to gain access to ECT sensor (3).Ĥ. SAE certified mechanic and technical writer. If it is running hot take it to the shop or replace your thermostat yourself this is probably the problem. We discuss how they operate, and cover warning signs that its time to replace your thermostat. SOURCE: showing a engine service soon The code that it is throwing is P0128, 'Coolant Temp Below Thermostat Regulating Temp. Do not disconnect any A/C hoses from compressor. Automakers dont specify a mileage when thermostats should be replaced. Carefully unbolt air conditioning compressor from front of engine. PARTIALLY DRAINED BEFORE REMOVING THE COOLANT TEMPERATURE SENSOR.ģ. WARNING: HOT, PRESSURIZED COOLANT CAN CAUSE INJURY BY SCALDING. ![]() It is installed into a water jacket at the front of the cylinder block. The Engine Coolant Temperature (ECT) sensor (3) on the 5.7L engine is located under the air conditioning compressor. The fans are turned on by the PCM, if the PCM is not telling the fans to turn on, they won't even if everything tests fine.Ĭoolant Temperature Sensor/Switch (For Computer): Service and Repair com is a great place for help and you can find factory service books on there. You or someone you know can try to locate the coolant sensor for the gauge and see if the connect to the sensor is loose or the wire have become damaged, giving you readings all over the place. Lastly, the sensor itself or the plug into the sensor is loose, broken, or shorting. If you recently filled up or topped off the coolant from a low coolant situation then you may have a major air bubble locked in the system, although this is far less likely in the small Sentra cooling system, but you never know. As your driving around sometimes liquid coolant touches the sensor and the temperature reading will spike again to normal readings or to an even hotter reading then normal (because what little fluid is in the system is not enough to maintain proper temps). Some of the most common symptoms of a bad thermostat are no heat, a spiked temp gauge, a blown head gasket, and more. A malfunctioning thermostat may lead to various issues and should be dealt with immediately. When your really low on coolant, some times the temperature sensor is exposed to air, instead of liquid coolant and the temperature of the sensor drops. The thermostat in your Nissan Sentras engine plays a crucial role in regulating its temperature. The gauge is driven by a temperature sensor that sticks into the cooling system. I have seen this happen to a few cars when they were running REALLY low on coolant (anti-freeze) AND/OR had a major air pocket trapped in the cooling system.
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