[A930Rocket]

What’s the best place to measure water temperature on an engine? I placed my sending unit on the radiator hose where water exits the engine.

I would think this is the hottest place to measure, unless you find somewhere at the back of the engine with less airflow. Would it be beneficial to know the radiator outlet temperature?

That said, I was seeing 210° On my autometer temp gauge driving at about 60 miles an hour. When I slowed down to 45 or 50, it cooled down to 195°. I don’t know if this was the thermostat opening and closing or what?

Edit: The aftermarket temperature gauge is making me paranoid, because the instrument cluster gauge is pointed straight up and down. On an E46, this means it’s in the normal range.

Edit 2: I realized today, my electric fan is not coming on. There is 12 V at the fan electrical connection. I hot wired the motor on the back of the fan and it spun up. The circuit board on the fan which is controlled by the DME probably toast. New fan and radiator going in next weekend. Hopefully, that fixes everything.