MrDee
Well-Known Member
Thank you
440 temperature sensor
- Thread starter MrDee
- Start date
Have you tested the factory gauge?
New parts these days fail I’ve learned
Sixpactogo
Well-Known Member
Not sure any of this helps but my 65 Sport Fury 383 is pretty accurate with the gauge reading. At 180 degrees, it shows about a quarter inch above that first mark on the gauge. I started it and warmed it up. The first mark on my gauge reads out to about 160 degrees engine temp and when I lift the wire to the gauge I read 15 ohms at the sender stud.
When the engine temp reached 180 degrees and I lift the wire to the gauge I read 12 ohms at the sender stud.
After shut down the engine temp creeps up to 200 degrees. I lifted the gauge wire and read 10 ohms at the sender stud.
The ohm reading on the uninstalled senders I have average out between 230 and 240 ohms with no gauge hooked up to them at around 75 degrees.
When the engine temp reached 180 degrees and I lift the wire to the gauge I read 12 ohms at the sender stud.
After shut down the engine temp creeps up to 200 degrees. I lifted the gauge wire and read 10 ohms at the sender stud.
The ohm reading on the uninstalled senders I have average out between 230 and 240 ohms with no gauge hooked up to them at around 75 degrees.
MrDee
Well-Known Member
That's great information. What does your installed sender read when the engine is cold?
Sixpactogo
Well-Known Member
I checked it before starting the engine but forgot to write it down. Seems like it was around 240 ohms. I gotta wait now I guess. I know that the reading changes with the wire hooked to the gauge because of the gauge windings and length of wire. I'm guessing the gauge windings are different from vehicle to vehicle too. You would think they should be pretty close to the same but what do I know!
I just checked my 60 Dart 318. It reads 237 unhooked from the gauge and 20 hooked up (cold)
I just checked my Fury....reads 66 ohms unhooked and 35 ohms hooked up at 130 degrees.
Pretty confusing but I think if you could find a sender that reads between 230 and 250 ohms uninstalled, they should work properly if your gauge is good. None are likely all that accurate. You probably need to see where your gauge reads at 180 degrees and just say that is where it wants to be if everything else is doing its job.
I just checked my 60 Dart 318. It reads 237 unhooked from the gauge and 20 hooked up (cold)
I just checked my Fury....reads 66 ohms unhooked and 35 ohms hooked up at 130 degrees.
Pretty confusing but I think if you could find a sender that reads between 230 and 250 ohms uninstalled, they should work properly if your gauge is good. None are likely all that accurate. You probably need to see where your gauge reads at 180 degrees and just say that is where it wants to be if everything else is doing its job.
MrDee
Well-Known Member
Thank you for all that. All very confusing indeed. Especially how it changes when it's hooked up vs not. I think if I can find a sender that reads less than 500 ohms I might get the gauge to read a little more accurately. Thank you again.
Thank you for all that. All very confusing indeed. Especially how it changes when it's hooked up vs not. I think if I can find a sender that reads less than 500 ohms I might get the gauge to read a little more accurately. Thank you again.
Heat gun on water pump housing 172 degrees reads 27.5 ohms with gauge wire unplugged
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MrDee
Well-Known Member
That looks to be about perfect. Now if I could I could only find one of those correct temperature sensors!
MrDee
Well-Known Member
If you have pay pal, I'd like to have you send me one of your extra temp sensors. Those two I bought from Tock Auto also read 500+ohms at room temp.
Sixpactogo
Well-Known Member
From testing 5 used temp sensors (3 older sensors with the 1/4 size and 2 with the 1/8" size) I would say they should all be around 250-260 ohms @ 70 degrees F.
From my testing, all of my used senders tested between 222 and 262. One new 1/8 sender read 549 ohms and I had marked it NFG years ago so that one appears to be junk like some of the new senders. The one 1/8 sender I have has the numbers 260 stamped in and reads 262 ohms so I gotta believe that is what it should be. Good luck finding one that works for you.
From my testing, all of my used senders tested between 222 and 262. One new 1/8 sender read 549 ohms and I had marked it NFG years ago so that one appears to be junk like some of the new senders. The one 1/8 sender I have has the numbers 260 stamped in and reads 262 ohms so I gotta believe that is what it should be. Good luck finding one that works for you.
MrDee
Well-Known Member
As I've discovered. I have quite a collection already!
Sixpactogo
Well-Known Member
I was just at an Oreillys store and tested one of their TS17 senders that crosses over to mopar pn 2426458. It ohmed out at 228 ohms at room temp. You gotta test it without touching it though because body temp will lower the reading. I would say it should read about 230 ohms at 70 degrees F but don't quote me on that. It is only my observation. On another note, they told me the mopar part number also crossed over to a TS37 sender. I wonder if that is the one that is registering 500 ohms. I was not able to test a TS37.
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