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No radiator pressure when removing the cap?

Discussion in '1st Gen. Tacomas (1995-2004)' started by Killer, Jul 3, 2010.

  1. Jul 3, 2010 at 8:58 PM
    #1
    Killer

    Killer [OP] Well-Known Member

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    Tonight my 1998 Tacoma overheated. I saw the needle start going up and I shut the engine off. I think I caught it in time. The problem is my pepcock on my brand new radiator is leaking.

    When I removed the radiator cap there was no pressure on it. I thought that it might be because the radiator was only 1/2 full of water. So I filled up the radiator.

    Now, after running the engine for 15 minutes or so, I can remove the radiator cap and there still is no pressure on it. I thought that it would spray me or something.

    It still has the factory radiator cap.

    I would appreciate any advice.
     
  2. Jul 3, 2010 at 9:00 PM
    #2
    Trap

    Trap Well-Known Member

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    Thermostat stuck? Depending on the engine it might be air locked too. There is a process to fill it up.
     
  3. Jul 3, 2010 at 9:04 PM
    #3
    Killer

    Killer [OP] Well-Known Member

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    I don't think the thermostat is stuck.

    On my trip home the needle would move the little bit that it normal moves. It normal runs 1/2 the way up the gauge and you can see the needle move about 1 mm or so.
     
  4. Jul 3, 2010 at 9:11 PM
    #4
    Trap

    Trap Well-Known Member

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    It's air locked or the thermostat is stuck. The hot water is not getting to the rad so it's probably so low it can no longer be pumped.
     
  5. Jul 3, 2010 at 9:17 PM
    #5
    battlescars

    battlescars Professionull

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    Yeah is your water pump working, how long can you drive until the needle starts to move?
     
  6. Jul 3, 2010 at 9:26 PM
    #6
    DWreck

    DWreck Famous Fabrication Vendor

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    It's leaking somewhere!
     
  7. Jul 3, 2010 at 9:27 PM
    #7
    Killer

    Killer [OP] Well-Known Member

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    I drove it home about 20 miles. Outside temp around 75. The needle stayed right on 1/2 way.

    I think the water pump is working. With the radiator cap off and the radiator full of water, you can reeve up the engine to 2k and the water will start overflowing out of the radiator.

    Also, on my trip home the radiator was picking up water out of the overflow jug. I overfilled the jug in case it lost to much water, when I got home the overflow jug was 3/4 full. Still well about the full mark.
     
  8. Jul 3, 2010 at 9:29 PM
    #8
    Killer

    Killer [OP] Well-Known Member

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    Yes, it is still leaking out of the pepcock.
     
  9. Jul 8, 2010 at 5:06 PM
    #9
    Killer

    Killer [OP] Well-Known Member

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    My problem ending up being the Radiator manufacture's mistake. The 3 month old radiator started leaking by the tank.

    I replaced the radiator and everything is good. The pressure is now fine.
     
  10. Jul 8, 2010 at 7:04 PM
    #10
    Barnone

    Barnone Guest

    Killer,
    Thanks for the update on the fix for your problem.
     
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