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radiator overflow

Discussion in 'The Garage' started by the excuse, Feb 10, 2004.

  1. the excuse

    the excuse 1/2 ton status

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    within seconds of start the radiator starts filling the overflow. i just got a new radiator cap, 16 lbs on a diesel radiator that is attached to a 350 engine. after a while it stops overflowing and when it cools off it sucks fluid back in. my question is, isnt the overflow not suposed to fill unless your overheating. and how can i be overheating seconds after start up? could it be my fluid has been watered down too much? it still is green, just not solid thick green.
     
  2. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

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    When the cooling system pressurizes (warms up), The fluid expands, the spring in the cap compresses, and the radiator gets full and lets the fluid go into the overflow. When it cools, the radiator sucks back in all the coolant. It should do it everytime the cooling system gets pressurized.
     
  3. the excuse

    the excuse 1/2 ton status

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    yeah i got that part but i didnt ralize the fluid could expand so quickly, its overflowing seconds after start up. it is also filled to the top.
     

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