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Michael Warfield
Michael Warfield, Factory Mercedes-Benz Technician
Category: Mercedes
Satisfied Customers: 3142
Experience:  Mercedes-Benz Master Certified technician
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Slk320: 100 degrees Celsius normal temperature reading..check first

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Is 95-100 degrees Celsius normal temperature reading for SLK(NNN) NNN-NNNN If it is not normal, what (and how) should I check first?
The temperature is slightly higher than normal for everyday driving. It is not unusual for the engine temperature to reach those temps on very hot days with the a/c on. I would change your engine thermostat regardless and perform a coolant drain and refill while your at it. The thermostat is located where the upper radiator hose connects to the engine. There is a red drain screw on the bottom of the radiator that you will need to loosen to drain the coolant out. It is only accessible with the front engine under shield removed. Drain the coolant and then replace the thermostat. Make sure to leave the coolant resevoir cap off when you first start the engine after filling the system back up. Turn the defroster on heat and wait for the engine to fully warm up and start to blow hot air from the vents. Make sure you keep the resevoir around half full at all times. When the defroster is blowing warm and the engine is at operating temp, you can top off the resevoir and install the cap.
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