The Ford Barn - View Single Post - 1950 239 flatheat water temperature sending units

1950 custom · 05-02-2022, 08:49 PM

I would think most here know theses flatheads have two temperature sending units. One with one terminal and the other with two terminals. I know the one with two terminals is strickly an on-off switch. The one terminal actually controls the temperature gauge by I think changing the resistance. My questions are
1. What is the temperature at which the two terminal switch closes and gives a ground to the circuit causing the gauge to move to hot?
2. At what temperature will it switch back?
3. Is there a resistance chart vs temperature for the one terminal sending unit that causes the gauge to move?

05-02-2022, 08:49 PM	#1
1950 custom Junior Member Join Date: Apr 2022 Posts: 6	1950 239 flatheat water temperature sending units I would think most here know theses flatheads have two temperature sending units. One with one terminal and the other with two terminals. I know the one with two terminals is strickly an on-off switch. The one terminal actually controls the temperature gauge by I think changing the resistance. My questions are 1. What is the temperature at which the two terminal switch closes and gives a ground to the circuit causing the gauge to move to hot? 2. At what temperature will it switch back? 3. Is there a resistance chart vs temperature for the one terminal sending unit that causes the gauge to move?