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new member here . coolant issues with my '06 tundra

Discussion in '1st Gen Tundras (2000-2006)' started by bobcat74, Apr 5, 2021.

  1. Apr 5, 2021 at 9:12 AM
    #1
    bobcat74

    bobcat74 [OP] New Member

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    good morning forum members . having coolant issues with my truck . first , let me give some background . i have 287k miles on her . i bought my tundra with 119k miles in 2011 . the truck has been a champ . all the usual maintence at the proper intervals has been done . heres my issue . i have a coolant leak somewhere and i cant find it ! this what i have done so far....
    1. upper and lower radiator hoses have been changed out
    2. new radiator installed last week ( my old radiator was about to give up the ghost )
    3.thermostat and gasket changed last week
    water pump is good . timing belt and water pump changed at 210k miles.
    oil is clean so there is no coolant in the crankcase , so im thinking my headgasket is good .
    no coolant smell in the cabin . carpet is dry so heater core is good .
    what i have not done is change out the coolant recovery tank and hose ..
    coolant loss is minimal .
    the temp gauge reads in the 3oclock position but before these issues , it read lower say between the 3oclock and 4 oclock position . after driving it , i would pop the hood and eyeball the engine to see if i can see anything leaking - nope not a drop . ive left clean cardboard underneath the engine to see if there are any drops of coolant - none . so there you have it . any advice / comments are welcome . thanks
     
  2. Apr 5, 2021 at 9:58 AM
    #2
    KNABORES

    KNABORES Not so new-ish Member

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    Bilstein 5100's 16x8 589's with 265/75/16 and 1.25" spacers Flowmaster 50 series over the axle dump Westin bull bar with 20" LED Pioneer touchscreen with backup camera Full interior and dash LED conversion Trailer brake controller with 7 pin Bedliner coat bumpers trim and tool box
    Have you checked the back of the engine? Several members have reported a leak towards the back of the engine that leaks down the back of the motor and is difficult to see. I believe its a an O-ring on one of the hard lines that failed them. Perhaps someone else will chime in. Welcome to the forum, and good luck with your problem!
     
    terrward likes this.
  3. Apr 5, 2021 at 10:13 AM
    #3
    BubbaW

    BubbaW FAA Tweaker

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    Bubba
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    GO VOLS
    Welcome....define minimal, cup in a day, week, month ?
     
    FirstGenVol likes this.
  4. Apr 5, 2021 at 10:47 AM
    #4
    terrward

    terrward New Member

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    Yup, have a really good look under the intake manifold for leaks. That pesky O ring might have failed.
     
  5. Apr 5, 2021 at 10:49 AM
    #5
    KNABORES

    KNABORES Not so new-ish Member

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    Bilstein 5100's 16x8 589's with 265/75/16 and 1.25" spacers Flowmaster 50 series over the axle dump Westin bull bar with 20" LED Pioneer touchscreen with backup camera Full interior and dash LED conversion Trailer brake controller with 7 pin Bedliner coat bumpers trim and tool box
    May be able to search and find a couple of recent threads related to this.
     
  6. Apr 5, 2021 at 10:54 AM
    #6
    Bakershack

    Bakershack Critical of Noncritical Thinkers

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    Welcome from LA (Lower Alabama)!

    Have you placed the cardboard further back, to check for the possible o-ring leak mentioned previously?
     
  7. Apr 5, 2021 at 10:56 AM
    #7
    KNABORES

    KNABORES Not so new-ish Member

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    Bilstein 5100's 16x8 589's with 265/75/16 and 1.25" spacers Flowmaster 50 series over the axle dump Westin bull bar with 20" LED Pioneer touchscreen with backup camera Full interior and dash LED conversion Trailer brake controller with 7 pin Bedliner coat bumpers trim and tool box
  8. Apr 5, 2021 at 5:03 PM
    #8
    bobcat74

    bobcat74 [OP] New Member

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    thanks for the replies . coolant loss is less than a cup over a weeks time . ill put the cardboard farther back and see if there is any sign of a leak towards the back of the engine and bell housing . if it is the " O " ring mentioned above , to change that out is beyond my automotive expertise .
     
  9. Apr 5, 2021 at 5:23 PM
    #9
    BubbaW

    BubbaW FAA Tweaker

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    GO VOLS
    less than a cup is going to be hard to see on ground but could be coming out the weep hole of pump. With ~80K miles on that pump, was it a good quality pump/installation as far you know ?
     
  10. Apr 5, 2021 at 6:58 PM
    #10
    jerryallday

    jerryallday New Member

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    Park at an incline (nose up) and check if there is any any coolant coming out betweenWhere the transmission me the engine.
     
    Last edited: Apr 5, 2021

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