Coolant & Air Temp. Sensors GM Coolant and Air Temperature Sensors This is a temperature to resistance chart for GM coolant and air temperature sensors. 1. Measure the resistance of a GM coolant or air temperature sensor and compare with chart. 2. Measured resistance should be at the resistance value on the chart based on the temperature of the sensor, plus or minus 50 ohms. Temperature - Degrees Fahrenheit Resistance - Ohms 210 185 160 450 100 1600 70 3400 40 7500 20 13500 0 25000 -40 Visit our Resource Library for available downloads