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High Temp weirdness

Discussion in '3rd Gen. Tacomas (2016+)' started by rutherford11, Feb 7, 2021.

  1. Feb 7, 2021 at 8:52 PM
    #1
    rutherford11

    rutherford11 [OP] Member

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    Hello,

    Newbie to the forum and would appreciate a little help with some Taco weirdness. It has been fairly cold here in MT, about -5 F today. I was driving home from work and high water temp alarm came on in my 2018 Taco. Sure enough, gauge was just below red range as I was traveling 60 MPH in 5th. I pulled over and idled and the temp gauge dropped back to normal within 20 seconds and did not climb from normal/middle detent for the remainder of the trip- 15 miles home on the highway.

    Any one have any issues like this? I am assuming it is related to extreme cold weather as the super quick reset of the gauge does not make any sense to me.

    Thanks.

    Lee
     
  2. Feb 7, 2021 at 9:06 PM
    #2
    Stocklocker

    Stocklocker Well-Known Member

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    Sounds like a stuck thermostat that unstuck itself.
     
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  3. Feb 7, 2021 at 9:16 PM
    #3
    whatstcp

    whatstcp Professional incoherent spammer

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    I would make sure reservoir is at proper level and burp the system in case it's low just in case, maybe get a cheap throwaway coolant tester from Walmart to test the coolant freezing temp.
     
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  4. Feb 7, 2021 at 9:27 PM
    #4
    rutherford11

    rutherford11 [OP] Member

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    Thank you gentlemen for your responses, I will follow through on your suggestions.
     
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  5. Feb 10, 2021 at 2:30 PM
    #5
    CT Yankee

    CT Yankee Well-Known Member

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    Only aesthetic mods so far Leer 180 cap & Clazzio covers on order.
    OR:
    I've seen this before - coolant in the radiator turning into slush because of the cold, inhibiting flow through the radiator. This in turn increases coolant temperature in the engine. Not know exactly where the coolant temperature sensor is located in the system makes it difficult to confirm that this is the issue.
    I've seen vehicles on our local interstate overheat in extreme cold because the coolant in the radiator froze.
    Stopping and letting the engine idle for a bit decreased air flow through the radiator allowing the coolant to thaw and returning the temp sensor to normal.
    -
    EDIT: A corresponding symptom to this phenomena was no heat emitted from the interior heater core and a corresponding lack of windshield defrosting.
    Might not be a waste of money to replace the thermostat.
     
    Last edited: Feb 10, 2021
  6. Feb 10, 2021 at 3:29 PM
    #6
    rutherford11

    rutherford11 [OP] Member

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    Thanks for the response. I checked specific gravity of coolant and everything looks good. Took it to Toyota and they said it was the crack in the shroud and air was not being directed to radiator. I scoffed but they replaced it for free and no problems on the drive home. They performed pressure test as well. Next morning-no cab heat for 20 miles(in neg 8 weather) and engine getting hot again. Heat finally came on and engine stabilized to normal operating temp. I am sure I heard some sound movement in dash prior to getting heat in the cab so I thought it was air bubble. Coolant dumped from the reservoir again as well. I tried to burp the system and very little air came out of the radiator and thermostat was open as upper hose was hot but lower hose was ice cold while performing the burp. Oil looks okay and not milky, I can not see any other leakage anywhere. At a loss. Will go back to Toyota.
     
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  7. Feb 10, 2021 at 3:37 PM
    #7
    stevesnj

    stevesnj Well-Known Member

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    Bad thermostat.
     
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  8. Feb 10, 2021 at 3:44 PM
    #8
    rutherford11

    rutherford11 [OP] Member

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    Bad thermostat= when it finally opens and engine is good and hot/too hot, coolant rushes to radiator and excess blows out of reservoir? That seems to make sense to me but not to Toyota Dealer.
     
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  9. Feb 10, 2021 at 3:48 PM
    #9
    stevesnj

    stevesnj Well-Known Member

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    Be interested to know what they say then.
     
  10. Feb 10, 2021 at 4:00 PM
    #10
    vicali

    vicali tirepicker

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    Err, spiking heat and blowing coolant was a headgasket leak in my second Gen. Gurgling behind dash was on the Toyota Mechanic symptoms checklist.

    exhaust pressurized system and blew coolant, also caused temps to spike. Have them check coolant for exhaust residue. There is a test that shows if it’s contaminated.
     
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  11. Feb 10, 2021 at 4:38 PM
    #11
    rutherford11

    rutherford11 [OP] Member

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    Checking for contaminated coolant was also on my list for them to do. Thanks for the suggestion.
     
  12. Feb 10, 2021 at 4:45 PM
    #12
    Jowett

    Jowett Well-Known Member

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    Here is the thermostat.... extra parts, extra complex, and extra failures are a possibility. Hopefully this covers the issue and you do not have further problems. Coolant temp is on the back of the cylinder heads.
    IMG_3966.jpg
     
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  13. Feb 10, 2021 at 4:46 PM
    #13
    The hammer

    The hammer Who’s the Wrench?

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    A hot engine is...

    [​IMG]
     
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  14. Feb 11, 2021 at 1:57 PM
    #14
    rutherford11

    rutherford11 [OP] Member

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    Negative 17 last night. On a whim followed up on your suggestion. Pulled radiator cap and "boom" slush, despite my cheapo specific gravity tester telling me antifreeze was good to -32. I think we found the problem.

    Thanks everyone for your suggestions. I have an appointment with Toyota tomorrow and may go anyways and have them flush system and check for exhaust products in the current system as well.
     
  15. Feb 11, 2021 at 4:40 PM
    #15
    stevesnj

    stevesnj Well-Known Member

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    Mix was wrong....bummer
     
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  16. Feb 11, 2021 at 4:43 PM
    #16
    MaverickT883

    MaverickT883 Where am I?

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    I'd honestly just flush the system myself and put in the best, highest rated antifreeze you can.
     
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  17. Feb 11, 2021 at 4:46 PM
    #17
    stevesnj

    stevesnj Well-Known Member

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    Use OEM or Pentafrost at the big box stores. Stay away from Prestone, Peak. If you can replace the thermostat too.
     
  18. Feb 11, 2021 at 5:45 PM
    #18
    Jowett

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  19. Feb 11, 2021 at 5:50 PM
    #19
    koditten

    koditten Well-Known Member

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    Reserected from the dead.
    @stevesnj got it.

    too much water and not enough concentrated glycol. The coolant was a slush and not circulating. Stopping the truck allowed it to thaw enough to become a liquid. It now was properly cooling your engine.

    Get the proper coolent blend and you will be fine.
     
  20. Feb 11, 2021 at 6:33 PM
    #20
    Slavato47

    Slavato47 New Member

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    Something similar happened to my truck last week. Was on the highway and shifted down to 5th and not a minute later I was getting the overheating notification. Coasted to the nearest gas station and also heard some weird noise from behind my dash. I looked underneath the truck and saw that my front driveshaft, skid plate, and transmission housing was covered in coolant. The dealership had it for a few days and couldn't determine where the leak was coming from but they suspect it's some manufacturing defect and are replacing the short block next week. Pretty bummed out and pissed off honestly. It's a brand new 2021 with less than 4000 miles. [​IMG]
     
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