MAHLE ORIGINAL TM1397 Map-Controlled Thermostat Every MAHLE Original map-controlled thermostat is designed to vehicle manufacturers' (OE) specifications - This map-controlled thermostat is the OE part number for this application A map-controlled thermostat controls the temperature levels depending on the vehicle's driving conditions/ load The last two or three digits of the MAHLE Original map-controlled thermostat represent the opening temperature of the thermostat in degrees Celsius