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05-02-2022, 08:49 PM | #1 |
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Join Date: Apr 2022
Posts: 6
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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? |
05-02-2022, 10:05 PM | #2 |
Senior Member
Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,319
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Re: 1950 239 flatheat water temperature sending units
First of all, you should know that Ford gauges do not use variable resistance. They operate on the "King-Seely" principle, which uses bi-metallic actuators in the sending unit that sends different pulses to the gauge that has a corresponding bi-metallic unit in the gauge that causes the gauge to register the reading.
A short search on the internet says the dual terminal gauge closes at 220 F. I would imagine that that it may vary between units, but it sounds about right. |
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05-03-2022, 08:50 PM | #3 |
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Join Date: Apr 2022
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Re: 1950 239 flatheat water temperature sending units
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Thanks for the information. Do you know the normal operating temperature with 180 degree thermostat? I am guessing somewhere between 180 and 190? |
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