How do you replace the engine coolant temperature sensor?

Answer 1

Different vehicles have the coolant temp sensors located in different places. Generally you will have to drain enough coolant so that the hole where the sensor is mounted won't leak coolant all over the place. Unplug the old sensor and remove it with the appropriate size wrench. Take the new sensor along with a new o ring or metal ring ( whatever your car came equipped with ) and thread it into the hole. Make sure not to cross thread the sensor or to tighten it too much. Your repair manual may have a specific torque spec for it and you should use it if it does. If not, use one finger on your wrench and only tighten it that much. Reconnect the wires to the new sensor. If it leaks later go back and tighten it just a little more. Some people use sealant or plumbers wrap, I prefer not to. If you use sealant make sure it's sensor safe and high temp. You will also have to wait for it to cure according to the directions on the tube before you can refill your coolant. Make sure to burp your cooling system and use the correct coolant in accordance with directions in your repair manual. Remember that antifreeze is sweet smelling and highly toxic and is dangerous to children and pets and should be disposed of properly; most local parts store will accept uncontaminated coolant for disposal.