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5VZ-FE slow coolant loss

Discussion in 'Tundras' started by anonymous27, Oct 30, 2021.

  1. Oct 30, 2021 at 4:43 PM
    #1
    anonymous27

    #1
    anonymous27 [OP] Member

    Joined:
    Jan 8, 2020
    Member:
    #315510
    Messages:
    13
    Vehicle:
    2004 Tacoma 3.4l, 2003 Tundra 3.4l
    Hi all,

    I’m working on a 2003 Tundra with the 3.4l 5VZ-FE and manual trans. I’m experiencing a slow loss of coolant that I first noticed about 6 months ago. I have since monitored the coolant level closely, but have had no luck tracing the leak. The most I’ll lose is about 2 inches from the reservoir over about 100 miles. I found a small leak from the water pump. I then replaced the water pump including new factory gasket and thermostat/gasket with jiggle at 6 o’clock. Still losing coolant. ECT is no greater than 181 degrees while driving. I have not experienced any performance issues, no overheating, no coolant on floorboard, and no signs of oil/coolant mixing. I’ve scanned relevant threads and I’m thinking a small leak at the coolant bypass tube inside the intake manifold or maybe a small leak in the radiator. Only leaks while running. About ready to try a pressure test, but would appreciate ideas/suggestions.

    Thanks
     
    anonymous27, Oct 30, 2021
    #1
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