Join Date: Apr 2009
Location: Blue Ridge
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I have the same setup for the temp gauge sensor on my boat. I think this type of hook up is very slow in response, as you are reading temp on the inlet side from the reservoir, not the heat exchanger.
On a recent trip the idiot light and buzzer went off, indicating high coolant temp, however the temp gauge did not move. After shutting down and inspecting, I noticed that the fresh water pump had worn out, and leaked coolant around the pulley shaft. The system was almost empty, but the reservoir still had plenty of coolant. My theory is, that while the pump was not moving much coolant, there was still a slow flow from the reservoir, keeping the sensor for the gauge cooler than the idiot light sensor, that is mounted right on the outlet flange to the heat exchanger. So there will be quite a delay in reacting to temp changes with this hook-up. I am not quite sure how to solve this problem, but there is a plug in the pump housing( to the left of your "in" arrow). Is there enough room to make it work?
I do not trust my gauge(btw, both gauge and sensor are working correctly) anymore,and will think of a better way to install the sensor. Right now it is nothing more than an "idiot gauge", that doesn't move.
If you prefer the gauge over the light/ buzzer, just swap out the sensors, and rely on the gauge. Drawback: constantly having to watch the gauge.
PSC 31 # 83