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B&M tranny cooler + Autometer temp gauge

Discussion in '1st Gen. Tacomas (1995-2004)' started by Markmarkmark, Mar 31, 2020.

  1. Mar 31, 2020 at 10:25 AM
    #1
    Markmarkmark

    Markmarkmark [OP] Well-Known Member

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    Hello,

    Trying to find what everyone's transmission temperature displays with the following mods or a similar transmission cooler with temp gauge set up.

    ---B&M super cooler with autometer electric temp gauge---

    I am running a selenoid from the return line through the inline sensor. (Improved Racing ENV-150 Dual Inline Oil Sensor Manifold Block, 3/8" Hose Barbs )

    My autometer reads under 100 degrees on normal driving conditions with no tow or load. I used a laser temp reader and I get between 65-80 degrees on the hose line and the tranny cooler. My transmission pan reads around 125-130 degrees.

    Just for reference, my truck is lifted 3' and I run 285/75/16 tires V6.

    I typically two a 6x10 with two race bikes spares and rolling tool cart. I've had my tranny temp sensor go off before without the transmission cooler.

    Question:

    - Is my temp sensor wrong?
    - How do I check my temp sensors accuracy?

    Thanks,
    -Mark
     
  2. Mar 31, 2020 at 10:48 AM
    #2
    opteron

    opteron Well-Known Member

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    I don't believe you would want your transmission temps that low.
     
  3. Mar 31, 2020 at 12:15 PM
    #3
    mechanicjon

    mechanicjon They call me "Jonny Stubs"

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    I'm running a trans cooler and my normal temps via scan gauge is 130 to 140 degrees. With 80 to 100 degrees ambient air temp.
     
  4. Mar 31, 2020 at 12:18 PM
    #4
    mechanicjon

    mechanicjon They call me "Jonny Stubs"

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    Is the temp gauge sensor stick down into oil flow? Also is you temp sensor on the outlet cooler line of trans or return line?
     
  5. Mar 31, 2020 at 12:19 PM
    #5
    Wulf

    Wulf web wheeler

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    yes
    100 degrees on the cool side and 125-130 at the pan? it sounds like the cooler is doing its job

    you may want to move the sender to the feed line or the transmission pan to get a more accurate reading or just add 30 deg to whatever the cooler return value is at
     
  6. Mar 31, 2020 at 1:33 PM
    #6
    nzbrock

    nzbrock Well-Known Member

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    There is no way those numbers are correct.

    I have a different cooler and gauge and I installed my sensor right at the outlet from the transmission. This should give me the hottest reading.
    Cruising in lockup mine sits right around 160, sometimes cooler depending on ambient temp.
    High shifting/load situations it will spike up to 200.

    Do you still have your transmission lines routed through the radiator? That should bring the temp close to the coolant temp.
    100 degrees is way too cold.

    If I were you I would get the sensor as close to the outlet of the transmission as possible. Putting it on the return line only tells you if the cooler is working. I would want to know how hot my transmission is getting, not what the cooler is doing.
     
    mechanicjon and opteron like this.
  7. Mar 31, 2020 at 2:07 PM
    #7
    SpikerEng

    SpikerEng Well-Known Member

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    Your temp gauge sending unit should be in the transmission outlet line, and it should always read hotter than the pan temp (transmission picks up the pan oil and heats it up before sending to radiator for cooling). So if you're measuring pan temps higher than your gauge or your line, you must have your gauge in the return line, not the outlet line.
     
    mechanicjon likes this.
  8. Mar 31, 2020 at 7:09 PM
    #8
    rj15tacoma

    rj15tacoma Well-Known Member

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    I have a scan gauge 2 and found a code on the internet that shows the tranny temp. Mine is an 01 prerunner auto and it reads consistently around 140, goes up to 180 when towing
     

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