Coolant/Radiator or Thermostat Issue

Discussion in 'Chevy S10 Forum (GMC Sonoma)' started by motor1, Feb 18, 2014.

  1. motor1

    motor1 New Member

    Hi, my name is Doug. I'm new to the forums. My girlfriend has an s10 with some sort of leak/drainage problem. When we fill up the coolant reservoir, in a short period of time it's empty. The radiator seems to stay full though. I'm not certain how it works exactly, but I do know the reservoir isn't supposed to be empty that quickly. I'm worried this may cause pressure issues that could damage the radiator. Any information on this will be a great help.

    -p.s. if the thermostat is not malfunctioning then the engine temperature is doing ok. -no overheating
  2. Jamm3r

    Jamm3r Member 2 Years 100 Posts

    Look for a puddle under the car when parked. It helps to put down a clean sheet of cardboard.

    A radiator pressure tester makes these problems much easier to find, best $70 you'll spend

    If there are no visible leaks you probably have a leaking head gasket.
  3. motor1

    motor1 New Member

    Thanks a bunch.
  4. edsmagichands

    edsmagichands Member 2 Years 100 Posts

    There are numerous reasons for what you describe. head gasket leak is a possibility,but a a major repair. give us the engine size, year & mileage and perhaps we can help you narrow it down. DON'T GUESS, TEST!
  5. wags391

    wags391 Member

    Also, instead of buying, rent. Rent tools at an auto parts store.


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