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1. Thermostat housing - sensor for the climate control cutout (when the temp rises it allows the blower to come on when coolant is 38C or above)
2. On the side of the engine - This is the temperature sender for the engine, it feeds the gauge on the instrument cluster
3. On top of the intake manifold - I think this is the temperature sensor for the glow plug relay, the temp it senses determines how long the "glow light" on the dash comes on. I may be wrong....officially I don't know exactly what it is.
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-diesel is not just a fuel, its a way of life- 
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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