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Thread: New Temp Gauge and sender now seems higher reading for fans to run.

  1. #1
    Senior Member Flash66's Avatar
    Join Date:  May 2014

    Posts:    239

    My VIN:    16811

    New Temp Gauge and sender now seems higher reading for fans to run.

    Hi all, my temperature gauge bit the dust and after troubleshooting everything and replacing the sending unit, it was definitely the gauge itself. My question is, my fans seem to come on with the new gauge reading 230deg (just above the 220 mark and turn off at around 205-210 (just below the 220 mark. What's puzzling is I could swear the old gauge would read about 190 for the fans to come on and never would reach 220 ever unless the ambient temp was near 100 and above (I live in Vegas). Now I did purchase the new sending unit on eBay which is prompting me to think the resistance value may be different causing a higher reading. I let the car warm up with the cap off and read the coolant temp in the bottle with an infrared therm and I couldn't get a reading from the water in the neck past 195 when the fans came on and down to 188 when they cycles off. So I guess my question is, what do anyone else's gauge read when the fans cycle on and off? Anyone else seem similar? Here's photos of it reading when on and off. I guess I could just order a DMC unit but would like some input from the gang before I go through changing it and maybe still getting the same reading. Thanks!!

    Fans cycle on:



    Fans Cycle off:

    Last edited by Flash66; 09-21-2017 at 05:23 PM.

  2. #2
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

    Posts:    6,653

    My VIN:    03572

    It's probably the sender. Very critical you get the stock unit.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  3. #3
    Senior Member Flash66's Avatar
    Join Date:  May 2014

    Posts:    239

    My VIN:    16811

    Thanks for the input Dave! I'll order one and give it a shot. Sure not looking forward to bleeding the cooling system again!

  4. #4
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

    Posts:    6,653

    My VIN:    03572

    Quote Originally Posted by Flash66 View Post
    Thanks for the input Dave! I'll order one and give it a shot. Sure not looking forward to bleeding the cooling system again!
    I ran a lot of testing of the sensor designing my new electronic otterstat. I had a new sensor I bought close to 10 years ago from Hervey and it tested good. I then got a used sensor from another owner and it also tested good.

    Anyway use this table to test your sensor with a multimeter.

    212 deg. F = 168 ohms
    200 deg. F = 210 ohms
    180 deg. F = 297 ohms
    160 deg. F = 428 ohms
    140 deg. F = 633 ohms
    120 deg. F = 965 ohms
    100 deg. F = 1489 ohms

    My thread is:
    http://dmctalk.org/showthread.php?15...tterstat/page5

    Sensor info starts around #45 in that thread.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  5. #5
    Senior Member Flash66's Avatar
    Join Date:  May 2014

    Posts:    239

    My VIN:    16811

    Thanks so much for sharing this info Dave! Absolutely incredible research in your thread to have answered any questions I could have to test the theory. Also looking forward to having one of your Electronic Otterstats.

  6. #6
    Senior Member Nuclearbacon's Avatar
    Join Date:  Jun 2012

    Location:  Santa Cruz, Ca

    Posts:    184

    My VIN:    10588

    Club(s):   (NCDMC) (DCUK)

    Hey Flash! Sorry to hijack, but whats that screen overlay you have on your cluster? Is that a GPS heads-up?
    -Luigi-
    Thank you ALL for your patience and your tremendous help!

    1982 VIN#10588 Build Date Dec '81

  7. #7
    Senior Member Flash66's Avatar
    Join Date:  May 2014

    Posts:    239

    My VIN:    16811

    No worries! Here's a link to the thread of the technology upgrades I made to this car and a YouTube link for a video overview.

    https://r.tapatalk.com/shareLink?url...8&share_type=t

    http://youtu.be/t6nVO-ITdvs

  8. #8
    Senior Member Nuclearbacon's Avatar
    Join Date:  Jun 2012

    Location:  Santa Cruz, Ca

    Posts:    184

    My VIN:    10588

    Club(s):   (NCDMC) (DCUK)

    Thank you so much!
    -Luigi-
    Thank you ALL for your patience and your tremendous help!

    1982 VIN#10588 Build Date Dec '81

  9. #9
    Senior Member Nuclearbacon's Avatar
    Join Date:  Jun 2012

    Location:  Santa Cruz, Ca

    Posts:    184

    My VIN:    10588

    Club(s):   (NCDMC) (DCUK)

    Quote Originally Posted by Flash66 View Post
    No worries! Here's a link to the thread of the technology upgrades I made to this car and a YouTube link for a video overview.

    https://r.tapatalk.com/shareLink?url...8&share_type=t

    http://youtu.be/t6nVO-ITdvs
    WOW. Awesome!!!!
    -Luigi-
    Thank you ALL for your patience and your tremendous help!

    1982 VIN#10588 Build Date Dec '81

  10. #10
    Senior Member Flash66's Avatar
    Join Date:  May 2014

    Posts:    239

    My VIN:    16811

    Thanks Bud!

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