(it wasn’t just the thermometer that told me) Be careful of the steam coming off… its really hot! I am sure you can guess how I know this.Once it gets to a steady boil (around 212 degrees F). Record the temperature of the water and the corresponding resistance you found. Use a multimeter to determine the resistance of the sensor.Suspend the sensor into the water using your coat hanger rig and let it sit for a moment.Put the pan on a different burner that’s not on, this will stabilize the water temp.Fill the pan with normal room temperature water and heat it up on the stove to about 100 degrees or so.Record the temperature and the corresponding resistance you found. Make sure it is not completely submerged, you do not want the connecter leads getting wet. Suspend the sensor into the water and let it sit for a moment.Bend the coat hanger so that you can set your sensor between two wires and then tape your sensor to the wires.You will need to rig up a coat hanger so that it can suspend the sensor end into the water without submerging it. Here is an example of what we did.It will probably hang around 33 degrees F when it’s ready. Put the cooking thermometer in the water and wait for the temperature to stabilize. Fill a pan completely full of ice and then add water till it’s close to the top.(Most manufacturers use CLT and IAT sensors with the same resistance curve… but you might test both to be sure) Pull the needed sensor out of your car.You will need the following items to be able to complete the below steps: Your Sensor, a Multimeter, a Pan, Cooking Thermometer (grocery store), a metal coat hanger, some Ice, and a Stove. The following instructions will give details on an easy way to produce the required information. If you are using a Megasquirt I, your results will need to be entered into EasyTherm. If you are using a Megasquirt II, we will need three different resistance readings to be able to generate a resistance curve for your sensors.

Gm coolant temp sensor resistance chart