Why does my 2004 Chevy Silverado spit radiator fluid out the overflow?

Check the radiator cap to see if the seal is torn or if the release valve inside the cap has failed or is sticking open. A radiator cap can cause the system to boil and spit out all of the coolant. via

What can cause coolant to leak?

5 Common Causes of Coolant Leaks and Their Symptoms

  • No. 1: There's a Hole in the Radiator.
  • No. 2: You Have a Leaky Radiator Cap.
  • No. 3: Your Head Gasket is Blown.
  • No. 4: Your Water Pump Has Failed.
  • No. 5: You Have a Problem With Your Expansion Tank.
  • Avoid Coolant Leaks Before They Happen.
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    How do you know if your engine is leaking coolant?

    Look for signs of coolant leakage—a light-colored residue or stain—around the radiator cap, on hoses throughout the engine compartment (check the ends where they are clamped to other components) and on the radiator itself. If it looks like a hose is leaking near a clamp, try tightening the clamp with a screwdriver. via

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