Tested the idea of using the rear engine drain port to add a water temp sensor. I installed the main temperature sensor in the rear drain port, and the new warning sensor in the Head. This way I could tell for certain what we were dealing with. It was interesting...
The rear drain will NOT be a suitable place to put a second sensor. I was uncertain, but now I know for sure what happens. Turns out, the temperature never reaches the 180 degrees the sensor reads when it's in the Head. It reads 30 degrees less. The reason for this I think is due to the 1/4 inch outlet and the fan blowing over it with very limited water circulation. The test ran for 20 minutes at 2000 rpm, so it was long enough. So that idea is out the window. Our warning sensor needs to read 230 degrees before it sounds off, so if we can't get 150 out of it, fuggetaboutit!
The next attempt and one that sounds more promising is the top heater hose port. It's at the lower thermostat housing. When using an IR Thermometer during the test today, I was getting 180 degrees (the same as the radiator hoses) in that location. It will work from a physical standpoint because you can still put your heater valve just after it. So, in the next few days, I will have the results of that location. More to come...
