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Third GEN water temperature gage

Discussion in '3rd Gen 4Runners (1996-2002)' started by CoolToyota, May 3, 2023.

  1. May 3, 2023 at 2:57 AM
    #1
    CoolToyota

    CoolToyota [OP] New Member

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    Actual mechanical water, temperature gauge. Has anyone done this ? I’m at 312k+ miles and I’ve only had it a couple months. I did have the oil light coming on and I checked my oil and it seems OK so I added a mechanical oil pressure gauge disconnected the switch and the pressure seems within range according to the Toyota service manual so it got me thinking what about the water temperature and since it’s just basically a light. I’d like to also keep the current water temp light/ gauge connected as well.

    70441291491__5EA74116-2EE0-495E-B3C3-C72DE4D533A1.jpg
     
    Last edited: May 3, 2023
  2. May 3, 2023 at 3:44 PM
    #2
    negusm

    negusm New Member

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    Can't you get this through the OBD2 port with a dongle?

    I know I monitor a bunch of stuff with my phone.
     
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  3. May 3, 2023 at 4:47 PM
    #3
    Kwikvette

    Kwikvette Kwik Fab

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    As mentioned above, use your OBDII port and monitor actual ECT as well as other vital information.

    The gauge on your dash is a dummy gauge and relies on a single-wire sender. This is problematic as you can get false readings and have altogether different results for example -

    Engine not overheating, a bad sender can fail to tell you that you're running too hot

    OR

    Engine running fine, a bad sender can falsely tell you that you're overheating

    The actual sensor that not only monitors your engine coolant, but also communicates with your PCM (open loop operation, etc) reads out to your OBDII and is in no way tied to the sender or gauge I explained above.
     
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  4. May 3, 2023 at 6:43 PM
    #4
    CoolToyota

    CoolToyota [OP] New Member

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    Great idea ! Any recommendations on what to plug into the OBDII that communicates to my iPhone ? Kwikvette and Negusm
     
  5. May 3, 2023 at 6:56 PM
    #5
    Kwikvette

    Kwikvette Kwik Fab

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    I wouldn't bother tying up a phone; the two most popular choices arw Scangauge and Ultragauge.

    I ran an Ultragauge when I had my 4Runner -

    20220117_122253.jpg

    If I recall correctly, I think Scangauge came out with a newer modern looking setup.

    Either connect via OBDII.
     
  6. May 3, 2023 at 7:18 PM
    #6
    CoolToyota

    CoolToyota [OP] New Member

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    Looks good - I will check that out ! Thanks
     
  7. May 3, 2023 at 8:21 PM
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    negusm

    negusm New Member

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  8. May 4, 2023 at 3:56 AM
    #8
    Alan-in-Alabama

    Alan-in-Alabama New Member

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    None.
    Last edited: May 4, 2023
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    #8
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  9. May 4, 2023 at 9:49 AM
    #9
    4scooter19

    4scooter19 New Member

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    https://www.amazon.com/Dewhel-Alumi...t=&hvlocphy=9033087&hvtargid=pla-570191884470
    I use one of these spliced into the upper radiator hose of my 66 mustang. The temp sender goes to a digital water temp gauge and also kicks on my electric fans.
     
  10. Nov 2, 2023 at 4:37 PM
    #10
    Scarpia

    Scarpia New Member

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    When your thermostat opens and coolant flow throughs the upper hose from the radiator into the engine, do you see a temperature change on the gauge? If so, then the gauge should show increase in temperature as the hot engine coolant flows through the radiator thence the hose with sensor. My goal is to verify the thermostat is working so if the temperature changes, the thermostat must be functioning; however, with the sensor in the radiator hose, it does not show at what temperature the thermostat is opening.
     

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