How does this improvised coolant temp sender work?


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Old 08-04-19, 04:05 PM
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How does this improvised coolant temp sender work?

92' Ford Ranger XLT with 2.9 V6. Back in 2008, I had an Autometer coolant temp gauge installed because the original factory one broke.

The gadget you see in the photo screwed in near the water outlet, is something the mechanic improvised. It is the sender for the gauge inside the truck. The old sender had an L-shaped rubber boot connector which I tied off.

How does this improvised coolant temp sender work? It works fine. But what if I need to replace it? What would I replace? Do I unscrew the blue fitting? Or do I pull out that metal stem?

I just don't know what part of that fitting I would replace.
 
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Old 08-04-19, 04:49 PM
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looks like a mechanical temp gauge so you would change everything sender and gauge if you ever need to replace it.
 
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Old 08-04-19, 05:21 PM
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Ahh.....................I kinda' suspected this is the type I had.

I did some reading. So you're saying what I have is most likely a 'Bourdon' type mechanical coolant temp sender and gauge?

So inside that fitting is a bulb that is immersed in coolant. Then a capillary tube filled with volatile fluid connects to the gauge where temp pressure causes an oval tube to turn the needle indicator?

And my reading states that the entire sender/capillary tube/gauge unit would need to be replaced, like Alan says.

What kind of fluid is in the capillary tube?

Does everyone agree this is what I have?
 
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Old 08-04-19, 08:38 PM
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That's really not improvised, it's a temp gauge with shelf components. You started out with an electric sender/gauge, this is just a different type of gauge.
 
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Old 08-05-19, 04:21 AM
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How does the engine run after this modification?
Fuel injected engines will normally use engine temperature to adjust fuel and timing settings.
 
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Old 08-05-19, 06:28 AM
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The temp monitoring used by the ECM for fuel is a different system that runs parallel to the sensor/gauge. It has it's own sensor.
 

Last edited by marbobj; 08-05-19 at 08:27 AM.
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Old 08-05-19, 07:13 AM
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Yeah. I see what you're saying. It's not an 'improvised' set-up.

The engine runs very well. Of course, I do a lot maintenance too.
 
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Old 08-06-19, 09:05 PM
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Thanks everyone. This discussion can be closed out as resolved. I will save and print.
 
 

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