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Still in wonderland as to my 96 Taco overheating

Discussion in '1st Gen. Tacomas (1995-2004)' started by MJMorlan17, Aug 8, 2017.

  1. Aug 8, 2017 at 10:03 AM
    #1
    MJMorlan17

    MJMorlan17 [OP] Member

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    Hello fellow Taco heads,and Im back again with a lot more knowledge due to idiots forcing me to get books and tools and dive in head first!Ok ,so,I had an overheating problem back when,turned out the head gasket was crushed on the exhaust side,pumping fumes into coolant equals hella hot! So,I got a new head kit,everything included,(head bolts,gaskets,etc,,)did the job myself,triple checking every step along the way!Turned the key after turning the last bolt,very proud of myself!One rainy night some five months later,look at my temp gauge,it is rising faster than the Rising Sun in Japan (pun intended)!Stop,open the hood,extremely hot top hose,cooler bottom hose.Changed the thermo in the morning,letting it cool over night!I never let it go red on the gauge!After that,all good for a couple of weeks,last night,gauge is climbing again.Pull over,let it sit over night ,going back to get it this morning.All the threads I have read! Ive checked and double checked all hoses,belts etc..Im having Kool Radiator here in Vegas check it today!Once again,everything is new,radiator,water pump,thermo,water inlet on the top hose,top and bottom hoses,belts!What in the hell could I be over looking!?!?!? Thanks in advance for your opinions!
     
  2. Aug 8, 2017 at 10:07 AM
    #2
    Clearwater Bill

    Clearwater Bill Sometimes when I close my eyes, I can't see.

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    Are we to assume you have no coolant loss?

    What driving conditions is the overheat happening under?

    You don't mention the cooling fan. Status of the fan clutch?

    But whatever, we're all just non-present guessers. The radiator shop should easily pinpoint your problem with a pressure test and infrared gun.
     
  3. Aug 8, 2017 at 10:22 AM
    #3
    tan4x4

    tan4x4 Well-Known Member

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    Replaced the radiator cap yet?
     
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  4. Aug 8, 2017 at 10:26 AM
    #4
    MrCrowntown

    MrCrowntown Well-Known Member

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    X2 on the cap. It's #1 part to verify


    EDIT: I wanted to add, is your EGR working correctly? It works to bring temps down in the cylinders, and I have seen a bad switching valve cause overheating conditions IE rising gauges, bubbling expansion tank etc
     
    Last edited: Aug 8, 2017
  5. Aug 8, 2017 at 10:27 AM
    #5
    tony2018

    tony2018 Well-Known Member

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    Any work done to the head, or heads?
    ditto on radiator cap too
    water pump replaced recently with the proper gasket (yeah my 3.4L looks to have the original pump from 2002 because theres no metal gasket).
     
  6. Aug 8, 2017 at 10:38 AM
    #6
    MJMorlan17

    MJMorlan17 [OP] Member

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    New "everything,cap,radiator,water pump gasket,egr regulator,checked egr by applying vac,etc,,,
     
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  7. Aug 8, 2017 at 10:40 AM
    #7
    MJMorlan17

    MJMorlan17 [OP] Member

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    normal driving conditions,brand neww 188 dollar fan clutch also
     
  8. Aug 8, 2017 at 10:40 AM
    #8
    tony2018

    tony2018 Well-Known Member

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    thermostat?
    So coolant is disappearing or leaking?

    If its disappearing than you probably need to get the head checked for warpage
     
  9. Aug 8, 2017 at 10:42 AM
    #9
    MrCrowntown

    MrCrowntown Well-Known Member

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  10. Aug 8, 2017 at 11:37 AM
    #10
    OneWheelPeel

    OneWheelPeel Well-Known Member

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    Sounds like an air pocket to me.
     
  11. Aug 8, 2017 at 11:44 AM
    #11
    otis24

    otis24 Hard Shell Taco

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  12. Aug 8, 2017 at 11:47 AM
    #12
    MrCrowntown

    MrCrowntown Well-Known Member

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    Great suggestion!

    I would also get a compression check out of the way
     
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  13. Aug 8, 2017 at 12:43 PM
    #13
    MJMorlan17

    MJMorlan17 [OP] Member

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    Heading to Kool Radiator now.Compression check will be done to!Ill get back to you all soon for the details on that!
     
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  14. Aug 8, 2017 at 12:48 PM
    #14
    Steves104x4

    Steves104x4 Well-Known Member

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    Is it the original radiator?
     
  15. Aug 8, 2017 at 3:59 PM
    #15
    miloaksrider

    miloaksrider Member

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    I'm agree w Mr crowntown. If you've check the usual and no luck check for exhaust in coolant. I will say this doesn't always cause coolant loss but usually does specially if you overheat it (in the red). I had similat prob on my 86 22R. Problem persiste even after new head, gasket, pump, radiator, tstat etc. Turned out to be hairline Crack in No. 2 cyl. Once I determined exhaust in coolant, off came the head. Filled block w tap water, let sit over night and a rust line in No. 2 appeared plain as day. Good luck. Peace.
     
  16. Aug 8, 2017 at 4:00 PM
    #16
    miloaksrider

    miloaksrider Member

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    Btw. I just did the head on my 04 2.7 w 229k. Running like a champ.
     
  17. Aug 9, 2017 at 12:00 AM
    #17
    MJMorlan17

    MJMorlan17 [OP] Member

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    Ok,so,after some time down at Kool Radiator,everything checks out ! Good compression,no exhaust being pumped into the coolant,coolant flow after thermo opens,hoses are fine,belts are fine,cap is fine,RADIATOR IS NEW,gonna jack it up in the morning and run it with the cap off in case there is an air pocket in the system,and will check the overflow tank and radiator daily for coolant level!Hopefully this over heating problem will end!Thanks for all of the input!
     
  18. Aug 9, 2017 at 8:13 AM
    #18
    Glamisman

    Glamisman Well-Known Member

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    when you put the thermostat back in did you position the jiggle valve properly? On 4 cyl it is positioned at 12 o'clock for the V6's it is at the 6 o'clock position.
    You do have the heater core "in the system" and not bypassed I hope and if so the valve is installed correctly
     
  19. Aug 9, 2017 at 4:42 PM
    #19
    vern650

    vern650 Well-Known Member

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