Strange radiator leak

Discussion in '80-Series Tech' started by EricG, Aug 21, 2006.

  1. EricG

    EricG

    Messages:
    2,194
    Likes Received:
    352
    Joined:
    Jul 12, 2006
    Location:
    Colorado Springs, CO
    Ever since I did the PHH a few weaks ago I've been trying to figure out where my coolant is going??? I've probably added about 2 gallons in the past 1000 miles. But no puddles in the parking lot, no smoke on startup or while running, no apparent water in the oil or vice-versa. I've been under the hood & under the truck with a flashlight hot & cold, running and not - nothing.

    Then today I had to take my daughter to school - only about 4 miles. When I came out I saw a steady dripping. Opened the hood and confirmed that it's coming from the radiator petcock area. Drove to work, made one stop about 10 miles along. No leaking at the stop or when I got to work.

    So - it only seems to leak when warm? Not hot, not cold. The only thing I can figure is that the window of opportunity is when the radiator has started to develop some pressure, but when it get's hot, whatever is leaking expands to close it off. Strange.

    I'm going to pull the petcock this weekend and take a closer look - maybe it's cracked or the o-ring is damaged. Any other ideas??
     
  2. -Spike-

    -Spike-

    Messages:
    7,048
    Likes Received:
    723
    Joined:
    May 26, 2005
    Location:
    Phoenix
    Dirt may be in the seat for the petcock. You might try opening and closing it a few times.

    -Spike
     
  3. CJF

    CJF

    Messages:
    7,115
    Likes Received:
    1,550
    Joined:
    May 31, 2005
    Petcock is a funny word...;p
     
  4. -Spike-

    -Spike-

    Messages:
    7,048
    Likes Received:
    723
    Joined:
    May 26, 2005
    Location:
    Phoenix
    Don't be makin' fun of my petcock...

    -Spike :D
     
  5. TLC42TD

    TLC42TD

    Messages:
    58
    Likes Received:
    0
    Joined:
    Aug 14, 2005
    Location:
    London SW15
    If it's one more than 100k, it probably needs replacing. Inspect the radiator up close and look for signs of decay. The symptoms you describe suggest small holes that release coolant under pressure from a hot engine, and these will only get worse over time. Replacement is an easy diy job but takes a couple of hours.
     
  6. Brentbba

    Brentbba Former Golfer SILVER Star

    Messages:
    10,191
    Likes Received:
    733
    Joined:
    Mar 27, 2003
    Location:
    OC, CA
    I've got a brand new one and a brand new thermostat I no longer need that I'll sell you.

    Cracked a radiator yesterday, so will be getting all new stuff. Truck is in Valencia and these new parts were 90 miles away at home.
     
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.