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x15 Coolant sys pressure test. Not losing pressure after 20 min

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Brandon0928, Dec 5, 2022.

  1. Dec 5, 2022 #1
    Brandon0928

    Brandon0928 Light Load Member

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    Did coolant pressure test. Found coolant leak from clamps being loose around hose from thermostat housing. Tighten them up and leak went away. I had it at 15 psi. It never came down from 15. What would cause it to not release pressure?
     
    Brandon0928, Dec 5, 2022
    Brandon0928, Dec 5, 2022
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  3. Dec 5, 2022 #2
    Brandon0928

    Brandon0928 Light Load Member

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    Also tested CAC and found a leak there. Not sure if that’s relevant to pressure not releasing
     
    Brandon0928, Dec 5, 2022
    Brandon0928, Dec 5, 2022
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  4. Dec 6, 2022 #3
    pushbroom

    pushbroom Road Train Member

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    If the coolant system has no leaks why would it come down from 15psi?
     
    pushbroom, Dec 6, 2022
    pushbroom, Dec 6, 2022
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    Catmando and lester Thank this.
  5. Dec 6, 2022 #4
    Brandon0928

    Brandon0928 Light Load Member

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    Wasn’t thinking I guess. I had watched a video and remember them saying you pressurize it and wait 5 minutes to see if how much pressure you lose . So I assumed after 5 minutes you slowly start losing it.
     
    Brandon0928, Dec 6, 2022
    Brandon0928, Dec 6, 2022
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  7. Dec 6, 2022 #5
    lester

    lester Road Train Member

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    Cooling system shouldn't loose pressure.
    CAC on the other hand, we'll it shouldn't loose pressure but I wouldn't expect it to hold pressure forever. I mean it would be great if it did but some loss is acceptable
     
    lester, Dec 6, 2022
    lester, Dec 6, 2022
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    Brandon0928 Thanks this.
  8. Dec 6, 2022 #6
    Brandon0928

    Brandon0928 Light Load Member

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    CAC has a pretty good leak. Can hear it hissing pretty and when spray soapy water it bubbles up good
     
    Brandon0928, Dec 6, 2022
    Brandon0928, Dec 6, 2022
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  9. Dec 6, 2022 #7
    D.Tibbitt

    D.Tibbitt Road Train Member

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    What device did you use to pressure test the cooling system?
     
    D.Tibbitt, Dec 6, 2022
    D.Tibbitt, Dec 6, 2022
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