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My 2001 Tundra is overheating

Discussion in '1st Gen Tundras (2000-2006)' started by Nhillbruner, Feb 26, 2017.

  1. Feb 26, 2017 at 12:02 PM
    #1
    Nhillbruner

    Nhillbruner [OP] New Member

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    I have a 2001 2WD Tundra with the 4.7L V8. It is not my daily driver and was gonna help someone move the other day (seems to be the only thing I use a truck for any more) and noticed my radiator had a very small leak (about 15 drops a minute). Deciding to address the situation I bought a new radiator and new hoses and new thermostat just to get it all. My water pump was replaced within the last 50k not sure when exactly.
    When I fired it up to look for leaks unnoticed the truck starting to overheat. I then replaced the fan clutch also. I bled the system as best I can and I'm still overheating.
    Has anyone else seen this before and if so what did you do to address it?!
     
  2. Feb 26, 2017 at 12:08 PM
    #2
    Nhillbruner

    Nhillbruner [OP] New Member

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    Also does anyone know the temp range it should be running at?! I have a reader and I've been shutting the truck down around 230 where the temp needle starts to rapidly approach the Red H
     
  3. Feb 26, 2017 at 12:16 PM
    #3
    dirtydeeds

    dirtydeeds New Member Vendor

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    more than I can list here
    Sounds like thermostat is stuck.
     
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  4. Feb 26, 2017 at 12:22 PM
    #4
    Nhillbruner

    Nhillbruner [OP] New Member

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    So in trouble shooting I cut the old thermostat so the metal ring and O ring keep it from leaking but it will not restrict fluid flow and I'm still having the eat issue.
    Sitting at idle with the heater on it will maintain around 223 or so but when driving or revving it goes up and doesn't come back down till I shut down and let cool
     
  5. Feb 26, 2017 at 12:24 PM
    #5
    Nhillbruner

    Nhillbruner [OP] New Member

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    And idling with heater off it just keeps climbing. It was approaching 240 (237) when I shut it down from idling and no heater
     
  6. Feb 26, 2017 at 12:31 PM
    #6
    Mike

    Mike Tread lightly.

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    yep bank account is running low from it..
    Thermostat or water pump failure. Mine runs at 195.
     
  7. Feb 26, 2017 at 1:15 PM
    #7
    Kaerntner

    Kaerntner New Member

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    Belt routed the right way?
     
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  8. Feb 26, 2017 at 1:19 PM
    #8
    ColoradoTJ

    ColoradoTJ #WAISTBAND

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    Motor could be air bound, but that is uncommon on V-8s.

    Take thermostat out and put it in boiling water. Open yes or no? Is it the correct one?
    If yes, move on.

    Like Mike said, probably the water pump.

    Since you replaced the radiator, any obstructions in the inlet/outlet? Correct radiator? I just replaced the radiator in my Jeep and the truecool came with caps on the ends, and one of them could be easily missed.
     
  9. Feb 26, 2017 at 1:42 PM
    #9
    Nhillbruner

    Nhillbruner [OP] New Member

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    Definitely not the thermostat, Like I said I cut out the center of the old one so when i reinstalled it it is just an opening. Takes longer to warm up but it will not restrict liquid flow to the radiator.
    My water pump isn't old, but it could be damaged. I didnt see any debris when i changed the radiator from the pump fins though. All I can think it could be is the water pump or a blown headgasket- getting combustion gases directly into the water jackets and causing it to over heat.
    Does anyone know of a way to check if the water pump is pumping correctly?!
     
  10. Feb 26, 2017 at 2:07 PM
    #10
    tomsinamerica

    tomsinamerica New Member

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    if it were the head gasket, you'd more than likely have other symptoms - either white smoke out of the exhaust, milkshake for engine oil or blowing hoses on the cooling system. Did you torque the water pump fasteners with a torque wrench? any chance debris got in the system during the rad change? Small pieces of discarded plastic film can really eff some s*** up...
     
  11. Feb 26, 2017 at 2:08 PM
    #11
    tomsinamerica

    tomsinamerica New Member

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    when you run the engine - do all the coolant pipes get warm/hot? if they are all getting warm at roughly the same time - logic states that water is flowing around rather than heating up through conduction which would take longer and appear at different time in different hoses.
     
  12. Feb 26, 2017 at 2:13 PM
    #12
    Nhillbruner

    Nhillbruner [OP] New Member

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    The upper hose gets hot, and the top of the radiator, but the lower hose is only hot near the thermostat housing. the closer on the hose toward the radiator the colder it gets. I have been trying to find out if that is the supply to radiator side or the return side. if it is the return side it makes sense being cold as it has already transferred to heat to the radiator. If it is the supply side then my pump is probably bad. does anyone know what the direction of coolant flow is on this truck?! also normal operating temp of the coolant system?
     
  13. Feb 26, 2017 at 2:27 PM
    #13
    ColoradoTJ

    ColoradoTJ #WAISTBAND

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    Lower radiator hose is usually the pump suction (larger hose).

    Mike said his truck runs around 195*F.
     
  14. Feb 26, 2017 at 2:47 PM
    #14
    Nhillbruner

    Nhillbruner [OP] New Member

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    Does anyone know how to test if the pump has failed?
     
  15. Feb 26, 2017 at 2:56 PM
    #15
    Mike

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    yep bank account is running low from it..
    Squeeze the top radiator hose with the engine running you should feel a surge of pressure when released if not you either have pump failure or a blockage in the system.
     
  16. Feb 26, 2017 at 4:32 PM
    #16
    Frkypunk

    Frkypunk "If a man is to be a street sweeper"

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    Air pocket in the cooling system...or you have a bad water pump.
     
  17. Feb 28, 2017 at 7:03 AM
    #17
    Kaerntner

    Kaerntner New Member

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    Why did you remove the thermostat? Now you have the same temp water thru out the system
     
  18. Feb 28, 2017 at 8:06 PM
    #18
    Nhillbruner

    Nhillbruner [OP] New Member

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    The thermostat is designed to prevent coolant from entering the radiator until it reaches a specific temp (usually 180 F). This allows the engine oil to reach optimum operating temperature quicker and reduces wear on the engine. By installing the old thermostat with the center cut out I can eliminate a potential bad thermostat that isn't opening and therefore not letting coolant get to the radiator. the fact that I know there is no blockage from the thermostat, lets me know that isn't the problem. Now the question is is it a blockage, a bad pump, or potentially a bad head gasket (although I have no signs of a bad head gasket other than the temp).
     
  19. Feb 28, 2017 at 8:23 PM
    #19
    ColoradoTJ

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    I'm betting it is a bad pump.
     
  20. Feb 28, 2017 at 8:26 PM
    #20
    Frkypunk

    Frkypunk "If a man is to be a street sweeper"

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    I did that years ago when I blew the head gasket...it will buy you time:) But not much.
     
  21. Feb 28, 2017 at 8:27 PM
    #21
    Nhillbruner

    Nhillbruner [OP] New Member

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    God I hope you are right!!! I dont have a lot of free time so I had a chance to get this far last weekend but I wont be able to take a look at it again for two more weekends. can anyone tell me what it looks like when you take the radiator cap off and run the engine... does the coolant pressure out the top consistently? im trying to figure out how to tell if the pressure is normal or low.
     
  22. Feb 28, 2017 at 8:50 PM
    #22
    Frkypunk

    Frkypunk "If a man is to be a street sweeper"

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    You should see the coolant circulating.
     
  23. Jun 9, 2018 at 1:31 PM
    #23
    Nhillbruner

    Nhillbruner [OP] New Member

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    I know this is a late follow up, but I eventually found a blockage. The new lower radiator hose that I had bought has a piece of rubber stuck inside it restricting the flow. Looked like residual from the manufacturing process. Goes to show, always inspect your parts before you install them. I wasted a lot of money on unneccesary parts and coolant before I finally found the problem.
    Over the last year I have had no issues with my truck (even though I still only drive 2-3 times a month!) besides the rear vent window latches broke last time I took the truck off-roading for a camping trip. Still haven't fixed them, need to find the time and cheap parts!
     
  24. Jul 13, 2018 at 8:22 AM
    #24
    TX-TRD1stGEN

    TX-TRD1stGEN ...

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    Thanks for posting the solution!
     
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  25. Aug 10, 2018 at 4:42 AM
    #25
    fudozen

    fudozen New Member

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