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Trouble bleeding coolant.

Discussion in '3rd Gen. Tacomas (2016-2023)' started by Tan Ten Ten, Sep 12, 2024.

  1. Sep 12, 2024 at 10:32 AM
    #1
    Tan Ten Ten

    Tan Ten Ten [OP] Member

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    I drained and filled my coolant, about 7qts. I'm squeezing the radiator hoses, getting the bubbles out, also started the truck and revved it, getting more bubbles out. I've had it running for about 30 minutes, revving it over 2000 rpm for a couple minutes, but the lower radiator hose is not getting hot. Coolant temp on the dash is normal.

    Does this lower hose just not get hot?

    Thanks
     
  2. Sep 12, 2024 at 12:02 PM
    #2
    Tacomike18

    Tacomike18 Well-Known Member

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    Thermostat needs to reach a certain temperature to open and let coolant through. If you have a tool that reads coolant temp that would help.
     
  3. Sep 12, 2024 at 12:34 PM
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    Tan Ten Ten

    Tan Ten Ten [OP] Member

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    I'm not sure if it opened or not. Would the lower radiator hose be obviously hot if it did?
     
  4. Sep 12, 2024 at 12:57 PM
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    3JOH22A

    3JOH22A トヨタ純正男娼

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    Usually you'd also turn the heater to full hot to circulate coolant through the heater core. Are you getting hot air from the dash vents? If so, then consider it good.
     
    Chew and kahanabob like this.
  5. Sep 12, 2024 at 12:58 PM
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    TacoTuesday1

    TacoTuesday1 Well-Known Member

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    did you use a vacuum filler like the repair manual says
     
  6. Sep 12, 2024 at 12:58 PM
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    Tan Ten Ten

    Tan Ten Ten [OP] Member

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    Yes had it running for 30 minutes with full heat.
     
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  7. Sep 12, 2024 at 12:59 PM
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    Arries289

    Arries289 Yo!

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    knayrb likes this.
  8. Sep 12, 2024 at 1:55 PM
    #8
    Tan Ten Ten

    Tan Ten Ten [OP] Member

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    It seems fine I just took a 20 minute drive and the temps are good. Hooked up my OBD to check temps also. Lower hose still doesn't feel hot.
     
  9. Sep 12, 2024 at 3:10 PM
    #9
    Toycoma2021

    Toycoma2021 Well-Known Member

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    Gravity must be suspended in your part the world and water never gets that low.
     
  10. Sep 12, 2024 at 3:16 PM
    #10
    BLtheP

    BLtheP Constantly Tinkering Member

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    Coolant flows through core full time, so won’t make any difference on this one.
     
  11. Sep 12, 2024 at 3:17 PM
    #11
    BLtheP

    BLtheP Constantly Tinkering Member

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    Yes, it is pretty normal to not have any hot coolant at the lower hose. You need to drive it to really get it up to full temp. Straight up on the gauge is not fully warmed up, it’s like 160°. Just cap it and start driving, it will burp any small bits of air out. As long as you got close to 7 quarts back in, you’re close enough.

    In winter my lower hose will be ice cold even after 30 minutes of driving.
     
  12. Sep 12, 2024 at 3:20 PM
    #12
    Tan Ten Ten

    Tan Ten Ten [OP] Member

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    Thanks, this is what I was so confused about. I'm sure I got it over 180 with all the revving in the driveway.
     
  13. Sep 12, 2024 at 3:21 PM
    #13
    BLtheP

    BLtheP Constantly Tinkering Member

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    I did mine back in like June, in Texas. I spent probably 30 minutes revving up and down and I barely cracked 175. As soon as I put it under load on the road though, it gets up to 195 quick. In the winter I want to say it stays more around 185 and I think that’s why the lower hose stays cold.
     
  14. Sep 12, 2024 at 3:22 PM
    #14
    Smacky2020

    Smacky2020 Well-Known Member

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    Stock wheels and suspension. Random "utilitarian" mods featured on this great forum.
    I've raised the front up or driven up on ramps which helps with bleeding too. Just watch your expansion tank for the next few days and top off if/as it gets low.
     
  15. Sep 12, 2024 at 6:05 PM
    #15
    InThePlains

    InThePlains Well-Known Member

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    Used this to bleed out air after changing the coolant bypass, worked like a charm.

    Don't expect to get ALL the air out all at once, drive it for a day or two, come back do it again, there's always small amount of air coming out.
     
    Tan Ten Ten[OP] likes this.

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