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Coolant leak

Discussion in 'General Tundra Discussion' started by Edog, Jun 15, 2025.

  1. Jun 15, 2025 at 8:18 AM
    #1
    Edog

    Edog [OP] New Member

    Joined:
    Jun 15, 2025
    Member:
    #136516
    Messages:
    2
    Gender:
    Male
    First Name:
    eric
    Vehicle:
    2003 Tundra SR5
    Thank you for allowing me to join. I have a 2003 Tundra SR5, 4.7L, which has coolant leak spots on various locations, (hoses, manifold, top of radiator, battery....). I have replaced the coolant in the reservoir two weeks ago and the level of the coolant in the reservoir is down again with more spotting on top of engine.
    I have considered replacing the radiator cap but it appears to be good with normal spring/ tension and the reservoir cap also appears to be good.

    Any suggestions? Should I pressure test the system? And prior threads talked about thermostat housing. And for the record, I am not a good mechanic but want to try to fix or understand prior to bringing to the repair shop.

    Thank you in advance
     
  2. Jun 15, 2025 at 11:34 AM
    #2
    blackdemon_tt

    blackdemon_tt Battery Slayer

    Joined:
    Feb 27, 2020
    Member:
    #43241
    Messages:
    3,130
    Gender:
    Male
    Vehicle:
    2007 5.7l Tundra DC SR5 long bed 2wd
    TRD Sway Bar, Roll covers USA bed cover
    Sounds like a cracked radiator. My SC had a corner cracked and would spray the top of the engine including the battery. Cheapest task is checking that cap and make sure it's still good.
     
  3. Jun 15, 2025 at 6:05 PM
    #3
    Edog

    Edog [OP] New Member

    Joined:
    Jun 15, 2025
    Member:
    #136516
    Messages:
    2
    Gender:
    Male
    First Name:
    eric
    Vehicle:
    2003 Tundra SR5
    Thank you for that information and advice. I did get a cap and will pressure test it to see if it is a small hairline crack. I believe it may just be that because of the accumulation of coolant residue on the front side of the radiator, between the frame and start of coil.
     

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