Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
Good morning, my name is ***** *****° is the default reading if there is no connection to the ambient temperature sensor. If you have replaced the sensor and the cluster the only thing left is the wiring harness. You will need to ohm out the harness to check for a break in the harness. A battery reset may get the temperature reading working. Disconnect both battery cables and join the two cables together for a few minutes then reconnect them to the battery and see if the gauge starts to read after a long road test. If you have no success you will need to check the wire harness.
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