1. Welcome to Tundras.com!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tundra discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other Tundra owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Losing coolant

Discussion in '1st Gen Tundras (2000-2006)' started by Creed, Jun 4, 2017.

  1. Jun 4, 2017 at 5:07 PM
    #1
    Creed

    Creed [OP] New Member

    Joined:
    Jun 4, 2017
    Member:
    #8001
    Messages:
    3
    Gender:
    Male
    First Name:
    Cody
    Vehicle:
    2005 Toyota Tundra
    I have had 2 instances recently, where my 2005 Tundra has leaked significant amounts of fluid. The fan, clutch, and front of the engine were wet, so I was unable to locate the source of the leak. 1 time the truck was over heating, and not the other. I'm thinking it could be a bad thermostat, and the overflow is leaking? Any ideas where to start my fix, would be appreciated.
     
  2. Jun 4, 2017 at 5:21 PM
    #2
    Nor7

    Nor7 Chilton Manual Guy

    Joined:
    Oct 19, 2015
    Member:
    #1989
    Messages:
    1,357
    Gender:
    Male
    Texas
    Vehicle:
    2007 Tundra Limited CM, 5.7L
    I'm not as familiar with the 1st gen, but on 2nd gen the water pump is located high and on the passenger side and is not immune from leaking. This would cover the areas you mentioned with coolant.
     
  3. Jun 4, 2017 at 5:30 PM
    #3
    Creed

    Creed [OP] New Member

    Joined:
    Jun 4, 2017
    Member:
    #8001
    Messages:
    3
    Gender:
    Male
    First Name:
    Cody
    Vehicle:
    2005 Toyota Tundra
    Well I replaced the water pump with the timing belt maybe 5k miles ago, I heard maybe the head gasket could be the culprit. I have checked the oil, and it is clean, with no moisture in it?
     
  4. Jun 4, 2017 at 5:38 PM
    #4
    Nor7

    Nor7 Chilton Manual Guy

    Joined:
    Oct 19, 2015
    Member:
    #1989
    Messages:
    1,357
    Gender:
    Male
    Texas
    Vehicle:
    2007 Tundra Limited CM, 5.7L
    My Dad's Camry blew a gasket once and it leaked internally straight into the cylinders, didn't see any coolant in the engine compartment so that's probably not it. I imagine if enough coolant had leaked out of the reservoir to cause an overheat you would have seen the cap blown off.

    And thermostats usually fail to the open position so that's a long shot.

    Maybe let it idle for a while in your garage and look to see if you can see it seeping out any where.

    On the occasions it leaked, what were the conditions? Was it hot/cold outside?
     
  5. Jun 4, 2017 at 6:05 PM
    #5
    Creed

    Creed [OP] New Member

    Joined:
    Jun 4, 2017
    Member:
    #8001
    Messages:
    3
    Gender:
    Male
    First Name:
    Cody
    Vehicle:
    2005 Toyota Tundra
    The day it overheated, it was hot outside. The other time it was cool in the morning. I will go let it idle,then if I cant locate the leak,we will pressure test it tomorrow. Thanks
     
  6. Jun 8, 2017 at 4:41 PM
    #6
    shaw0531

    shaw0531 New Member

    Joined:
    May 16, 2016
    Member:
    #3388
    Messages:
    106
    Gender:
    Male
    First Name:
    Jake
    Vehicle:
    2006 Spectra Blue Mica Tundra SR5 2WD DC
    Could be a bad waterpump or seal that was put on. I bought mine and dealership had to replace the waterpump 3x in a month due to faulty ones. I finally took it to another shop I'd done business with before and they put on a gates pump. Been purring ever since
     
  7. Dec 16, 2017 at 6:17 PM
    #7
    Filthyphil

    Filthyphil New Member

    Joined:
    Oct 24, 2016
    Member:
    #4978
    Messages:
    57
    Gender:
    Male
    First Name:
    Phil
    Vehicle:
    2000 Toyota Tundra TRD 4.7
    Check your upper and lower radiator hoses, also check and see if there is any small cracks on your radiator. I doubt it’s the head gasket highly.
     
  8. Jan 2, 2018 at 4:19 PM
    #8
    mudslinger79

    mudslinger79 New Member

    Joined:
    Dec 30, 2017
    Member:
    #11852
    Messages:
    508
    Gender:
    Male
    First Name:
    Christopher
    Williamsburg, Va
    Vehicle:
    2006 Double Cab, Phantom Grey Pearl
    Leveled. 16x8 Pacer 164 wrapped in 295-75-16 General AT2. Flowmaster exhaust. K&N Cold air intake.
    Check ALL of the teeny coolant hoses that are routed in front of the engine. I just had a 4Runner leaking coolant. Looks like a water pump (same area) pressure tested it and found a small coolant hose leaking. in front of the fan, to the right. Connected to a metal pipe.
     
  9. Dec 3, 2018 at 2:44 PM
    #9
    Rheywood456

    Rheywood456 New Member

    Joined:
    Sep 6, 2018
    Member:
    #19073
    Messages:
    205
    Gender:
    Male
    First Name:
    Riley
    Kansas City
    Vehicle:
    First Gen Tundra
    Do you remember the name of that hose by chance? Mine sprung a leak and can’t figure out which part number / name it is...

    I’ll upload a photo of the one I’m talking about. I think it’s the one running to the oil cooler?

    F0245344-FC1D-43F4-AFE6-0F4A04B11E1A.jpg
     
  10. Dec 3, 2018 at 5:18 PM
    #10
    Professional Hand Model

    Professional Hand Model Fred Brookes

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    1,704
    Gender:
    Male
    Vehicle:
    2002 Tundra SR5 4WD
    Aluminum sideboxes
    Any way to cut that bad end off and choke up on to the better part of the hose with the clamp?
     
    Rheywood456 likes this.
  11. Dec 3, 2018 at 5:25 PM
    #11
    Rheywood456

    Rheywood456 New Member

    Joined:
    Sep 6, 2018
    Member:
    #19073
    Messages:
    205
    Gender:
    Male
    First Name:
    Riley
    Kansas City
    Vehicle:
    First Gen Tundra
    Don’t have a ton of wiggle room. But Ill definitelyreplace the clamp with a hose clamp. Those seem to hold up better (and are easier to work with).

    But the hose is quite swollen. I’m sure it’s the original hose. Just can’t seem to find which hose it is on the parts diagrams
     
  12. Dec 3, 2018 at 5:29 PM
    #12
    Professional Hand Model

    Professional Hand Model Fred Brookes

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    1,704
    Gender:
    Male
    Vehicle:
    2002 Tundra SR5 4WD
    Aluminum sideboxes
    Might be able to grab some hose at the auto store.
     
    Rheywood456 likes this.
  13. Dec 3, 2018 at 5:36 PM
    #13
    Rheywood456

    Rheywood456 New Member

    Joined:
    Sep 6, 2018
    Member:
    #19073
    Messages:
    205
    Gender:
    Male
    First Name:
    Riley
    Kansas City
    Vehicle:
    First Gen Tundra
    Yeah that’s what’s going to have to happen since I can’t find nuttin! I still think it’s a coolant hose going to the oil cooler.

    Is the first gens heater exchange similar to the newer gens? I’m unfamiliar with it
     
  14. Dec 3, 2018 at 8:10 PM
    #14
    Rheywood456

    Rheywood456 New Member

    Joined:
    Sep 6, 2018
    Member:
    #19073
    Messages:
    205
    Gender:
    Male
    First Name:
    Riley
    Kansas City
    Vehicle:
    First Gen Tundra
    Looks like the Oil Cooler Hose is one piece from Toyota (including the metal hose)... so DIY hoses may be the only option without having to replace the entire section
     
  15. Dec 4, 2018 at 7:20 AM
    #15
    Rheywood456

    Rheywood456 New Member

    Joined:
    Sep 6, 2018
    Member:
    #19073
    Messages:
    205
    Gender:
    Male
    First Name:
    Riley
    Kansas City
    Vehicle:
    First Gen Tundra
    Confirmed after driving home last night from work. It’s leaking from the top of that hose. It was fizzing. Going to run to Oreillys to Grab some matching hose

    718A29F1-7B00-4811-9885-C0DFC648317F.jpg
     
  16. Dec 7, 2018 at 4:49 AM
    #16
    Professional Hand Model

    Professional Hand Model Fred Brookes

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    1,704
    Gender:
    Male
    Vehicle:
    2002 Tundra SR5 4WD
    Aluminum sideboxes
  17. Dec 7, 2018 at 9:14 AM
    #17
    Rheywood456

    Rheywood456 New Member

    Joined:
    Sep 6, 2018
    Member:
    #19073
    Messages:
    205
    Gender:
    Male
    First Name:
    Riley
    Kansas City
    Vehicle:
    First Gen Tundra
    Yeah it’s fixed. Didn’t end up replacing the hose. I slid the clamp down a tad and tightened it good. Same with the other side.

    I grabbed some extra coolant hose and some hose clamps from the auto store to replace it. But it’s a snitch to get to. I took off the air intake assembly and the serp belt just to give me more room. But even then I struggled. I should’ve replaced those hoses when I did the timing belt. DOHHH!

    So I tightened everything up added 1/2 cup of coolant which I lost and so far haven’t lost another drop. Doing a nice little 2hr drive tomorrow should get everything pumping and pressurized which will be a good test to see how everything’s holding up. I’ll bring the spare hoses with me...should make an interesting parking lot job in this cold.... haha
     

Products Discussed in

To Top