Checking the coolant temperature sensor on a Mercedes R107 - Classic Car Repair - DIY

We check the cooling water temperature sensor B13 on the Mercedes R107, shown here on the example of the 560SL with the M117 engine. Since 1985 (for the models 300SL, 420SL, 500SL and 560SL), the B13 sensor is shown in the wiring diagram and connected with a green cable. On the V8 engines M116 and M117 the sensor is near the thermostat housing and on the inline 6 cylinder M103 near the bulkhead.
To avoid damage to the engine, the function of the sensor should be checked. Especially if you think that the temperature is not displayed correctly in the instrument cluster.
Mercedes classic car repair, maintenance, restoration and care
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Work on vehicles requires special expertise. Always commission an authorised workshop for repairs and maintenance. The articles shown here are in no way a substitute for specialist literature and are intended as suggestions and as a means of passing on information.
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