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What’s wrong with my coolant system?

Discussion in '1st Gen. Tacomas (1995-2004)' started by Mlhamil3, Jul 7, 2020.

  1. Jul 7, 2020 at 7:22 PM
    #1
    Mlhamil3

    Mlhamil3 [OP] New Member

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    Replaced my coolant thermostat. Replaced coolant with regular green coolant. Drove it and burped it. Put more coolant in to “F” line on tank. Today the temp gauge got super high (see pics) and the coolant was literal boiling hot (see video)

    What’s wrong?

    [​IMG]

    376BC0BE-B732-4A90-B3B4-0ED1FE67D0A8.jpg
     
  2. Jul 7, 2020 at 7:28 PM
    #2
    High Noon

    High Noon The worst of humanity

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    When's the last time you did the pump? Can't see the video. Hook up to obdII scanner and see what the temp reads there.

    And welcome to TW
     
    Last edited: Jul 7, 2020
  3. Jul 7, 2020 at 7:49 PM
    #3
    0xDEADBEEF

    0xDEADBEEF Well-Known Member

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    Which engine, and which way did you orient the jiggle valve on the new thermostat?
     
  4. Jul 7, 2020 at 8:04 PM
    #4
    Black DOG Lila

    Black DOG Lila Well-Known Member

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    Welcome aboard new member
    Toyota coolant is red or pink
     
    Wyoming09 likes this.
  5. Jul 7, 2020 at 8:10 PM
    #5
    cruxofthebisquit

    cruxofthebisquit Well-Known Member

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    Burp it again. Prob. hung up in heater core.
     
  6. Jul 7, 2020 at 8:13 PM
    #6
    Hobbs

    Hobbs Keep'n it Squatchy.

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    Coolant level
    leaks
    fan belts
    load on vehicle
    air flow through radiator including fan clutch if equipped
    coolant flow around cooling system.

    for starters...
     
  7. Jul 7, 2020 at 8:15 PM
    #7
    tacoma4

    tacoma4 Well-Known Member

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    Radiator cap can also cause that. Make sure it didn't fall apart when you removed it. Seen that before.
     
  8. Jul 7, 2020 at 8:17 PM
    #8
    Fire Chicken

    Fire Chicken Aka 'Panda Express'

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    Do these have electric fans or mechanical? When I replaced the thermostat on my corolla, I pulled the electric fans out to give myself more room to work. Whe putting it back in my switch didnt seat all the way so my fans didnt power up when needed.

    Also, in general does your fan kick on?
     
  9. Jul 7, 2020 at 8:20 PM
    #9
    wrightme43

    wrightme43 Well-Known Member

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    Why did you replace your thermostat?
    Is the reason you replaced because of overheating?
    Could be any number of things
    The more clear information provided the more people can help.
     
    cruiserguy likes this.
  10. Jul 7, 2020 at 8:48 PM
    #10
    tony2018

    tony2018 Well-Known Member

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    ^^This,
     
  11. Jul 7, 2020 at 9:05 PM
    #11
    Gyrkin

    Gyrkin Well-Known Member

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    What kind of coolant was in it before? Toyota red doesn't play nice with regular green. It's hard to get it all out. It takes a pretty thorough flush to get it done. If it had Toyota red in it before, you could have a mixture of the two types. Word is when they mix it makes a nasty sludge.
     
  12. Jul 7, 2020 at 11:03 PM
    #12
    Glamisman

    Glamisman Well-Known Member

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    not sure if you can put the thermostat in backwards, so, did you put the thermostat in backwards i.e. spring pointing away from the block?
     
  13. Jul 7, 2020 at 11:42 PM
    #13
    BeastyDirtSlut

    BeastyDirtSlut Well-Known Member

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    While burping did you have the heater on full blast in the truck? An air pocket in the system will back itself up against the thermostat until the pressure finally forces it open or it overheats.
     
  14. Jul 8, 2020 at 1:44 AM
    #14
    zooma-loom

    zooma-loom Well-Known Member

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    RIGHT out of sight of SCOTTSDALE, AZ
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    You can install the t-stat backwards, I did it and caught it quickly
     
  15. Jul 8, 2020 at 1:54 AM
    #15
    Wyoming09

    Wyoming09 Well-Known Member

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    Cheap China built thermostat??
     
  16. Jul 8, 2020 at 6:02 AM
    #16
    skeezix

    skeezix Well-Known Member

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    :popcorn:
     
    GQ7227 likes this.
  17. Jul 8, 2020 at 8:05 AM
    #17
    ChrisCharles

    ChrisCharles Member

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    In to see what is up.

    Just changed my radiator since I noticed a crack when changing the timing belt.

    I put in a 170* thermostat as well. Didn't make any difference on the dummy gauge that I can tell.
     
  18. Jul 8, 2020 at 8:11 AM
    #18
    taco52

    taco52 01 5 speed

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    Very likely it could be the jiggle valve. I installed the jiggle valve up on a T-stat and had overheating issues on my 3.4l. You would think the jiggle valve is properly installed at the 12 o'clock position since air bubbles rise but the correct orientation is at 6 o'clock. This is easily overlooked and caused my overheating issues last time I did a t-stat.
     
  19. Jul 8, 2020 at 8:18 AM
    #19
    tacoRenner

    tacoRenner Well-Known Member

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    Why'd you replace T-stat? I had an old ranger i was doing preventative maintenance on, changed the T-stat and truck would randomly overheat. Put another new one in and my problem went away. Food for thought.

    If your truck was overheating before as well, could be a number of things. Water pump, clogged radiator, clogged heater core ect. Start feeling Radiator lines and heater hose lines for temperature to make sure fluid flowing
     

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