So I replaced the coolant temp sensor that goes to the gauge cluster. When I pulled it out it had all this white gunky buildup on it. I’m not sure if you can see it in the pic, but it was on the sensor itself and a little ring formed on the threads that looks like a gasket.
Is this a problem and if so what should I do? I’ve never seen it this stuff build up like that. Also when I replaced the thermostat I drained the radiator and the coolant looked brand new. So what gives?