The temperature sensor is in the intake manifold. The gauge reads cold (below 130 the lowest it reads) if I crimp both the tubes going from the tees where the water pump is normally to the thermostat housing the gauge jumps right up to 190 and stays there. As soon as I let them go it drops back down to below where the gauge reads.
How do I fix this? Do I have something set up wrong?
Last edited by Motomatt68; 05-31-2015 at 08:29 PM.
I solved my problem by adding a gate valve between the tees where the water pump normally goes and the bypass thermostat. I believe that the resistance in the engine water passages was high enough that it allowed water coming from the bypass to flow into the intake manifold just enough to cool the sensor which was near the thermostat.
By necking down the bypass water it equalized the pressure stopping the back flow.
you shouldn't need that gate valve there. Something else is wrong. Are you sure you have everything installed correctly? Hoses going to the correct ports? You have that plastic 4 vane valve in there? Thermostat installed correctly? Thermostat has a bypass hole drilled into the side of it?