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I have yet another question, about my coolant sensor #2716192
11/15/19 07:10 PM
11/15/19 07:10 PM
Joined: Sep 2003
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Lebanon ,PA in the Susquehanna...
70Challengerse Offline OP
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Lebanon ,PA in the Susquehanna...
My coolant gauge in my 71 cuda 440 reads about 3/4 or more when fully warmed up....Shouldn't it read towards the bottom just pass the first line, I have replace the gauge twice, I have replaced the sender twice, and I have replaced the limiter, my challenger reads about the first line..and before you ask I have checked with a temp led gauge reading about 181 degress at the water pump... shruggy

Last edited by 70Challengerse; 11/15/19 07:11 PM.
Re: I have yet another question, about my coolant sensor [Re: 70Challengerse] #2716199
11/15/19 07:22 PM
11/15/19 07:22 PM
Joined: May 2003
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Downtown Roebuck Ont
Twostick Offline
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Downtown Roebuck Ont
Originally Posted by 70Challengerse
My coolant gauge in my 71 cuda 440 reads about 3/4 or more when fully warmed up....Shouldn't it read towards the bottom just pass the first line, I have replace the gauge twice, I have replaced the sender twice, and I have replaced the limiter, my challenger reads about the first line..and before you ask I have checked with a temp led gauge reading about 181 degress at the water pump... shruggy


Both are the same temp, 181 for their respective gauge readings?

Kevin

Re: I have yet another question, about my coolant sensor [Re: Twostick] #2716208
11/15/19 07:50 PM
11/15/19 07:50 PM
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Lebanon ,PA in the Susquehanna...
70Challengerse Offline OP
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Lebanon ,PA in the Susquehanna...
the temp is perfect, but why does one read at the low line and the other read at the high line, with the same temp being 180

Re: I have yet another question, about my coolant sensor [Re: 70Challengerse] #2716355
11/16/19 12:07 PM
11/16/19 12:07 PM
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central il.
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second 70 Offline
top fuel
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central il.
My 70 cuda reads just under half way at 180.

Re: I have yet another question, about my coolant sensor [Re: second 70] #2716372
11/16/19 12:51 PM
11/16/19 12:51 PM
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Andrewh Offline
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it may be a matter of mix and match to get it to read where you want.

based on voltage that gets to the gauge due to resistance.

5 volts assuming your other gauges read correctly

10 to 73 or 12 to 78 ohms for the sending unit. same as the gas tank one, so if you have a spare one of those you can test the gauge vs boiling water to check.

There is going to be some fudge factor in the sending and gauge units.
you could add some resistance in the line to make it read what you want, and then if it moves past that you know you are in trouble vs what it currently shows.

Re: I have yet another question, about my coolant sensor [Re: Andrewh] #2716383
11/16/19 01:15 PM
11/16/19 01:15 PM
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Ontario, Canada
RealWing Offline
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Ontario, Canada
Could be poor contact at bulkhead connector or gauge out of calibration. Another source of resistance is where the wire connects to the circuit board
Jim


1970 Superbird 440-6bbl, auto
1969 Barracuda 340-4bbl, FB Formula S auto
1969 Barracuda 6.1 L Hemi, 5 speed, Convertible
2022 Can Am Spyder RTL
Re: I have yet another question, about my coolant sensor [Re: RealWing] #2716392
11/16/19 01:46 PM
11/16/19 01:46 PM
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Lebanon ,PA in the Susquehanna...
70Challengerse Offline OP
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Lebanon ,PA in the Susquehanna...
Thanks guys, all the wiring is new( yes I know that dont mean squat) I agree with Andrew on the resistance, I noticed 68 uses a different sender, does and one know the difference in resistance , are and which way to go on a resister. hard to believe everything is out of whack, just bothers me to see the gauge that high, but knowing its not running hot,and nothing is working.. shruggy

Re: I have yet another question, about my coolant sensor [Re: 70Challengerse] #2716393
11/16/19 01:49 PM
11/16/19 01:49 PM
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Fresno, CA
Jim_Lusk Offline
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Gauges are adjustable...

Re: I have yet another question, about my coolant sensor [Re: 70Challengerse] #2716433
11/16/19 03:28 PM
11/16/19 03:28 PM
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So Cal
Sinitro Offline
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So Cal
There is a 15% +/- of tolerance for the resistance output of a sensor. Also for the posted discrepancies, what brand was the sensor?
Aftermarket sensors can/will vary alot, that's why we always try to use an OE sensor.

Just my $0.02... wink

Re: I have yet another question, about my coolant sensor [Re: Jim_Lusk] #2716481
11/16/19 05:36 PM
11/16/19 05:36 PM
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Lebanon ,PA in the Susquehanna...
70Challengerse Offline OP
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Lebanon ,PA in the Susquehanna...
[quote=Jim_Lusk]Gauges are adjustable... [/quote
I did not know that ... Napa sender 2 of them... and 2 gauges

Re: I have yet another question, about my coolant sensor [Re: 70Challengerse] #2716497
11/16/19 06:19 PM
11/16/19 06:19 PM
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nowhere
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Sniper Offline
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test them and find out

guage ohms.jpg
Re: I have yet another question, about my coolant sensor [Re: Sniper] #2717382
11/19/19 02:06 AM
11/19/19 02:06 AM
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5thAve Offline
Doesn't care what this says anyway
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Did you try a used sender? I had problems years ago, replacement senders I was finding all had a different length of probe then stock and didn't read right. I stuck a used one in from a spare intake I had kicking around and went back to working properly again.







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