If your vehicle is showing green, orange, pink, or yellow fluid leaking under the front of the vehicle, here are the most likely causes and the parts you'll need to fix each one.
Rubber radiator hoses degrade, swell, or crack over time due to extreme heat and pressure. Loose clamps from a recent service or improper seating are also frequent causes of leaks at the connection points.
The plastic end tanks on modern radiators become brittle and crack after years of heat cycling. The aluminum core can also be punctured by road debris or corrode from the inside out.
When the internal bearing or seal of the water pump begins to fail, coolant leaks from a designed 'weep hole' to warn you before a complete and catastrophic failure occurs.
Plastic thermostat housings frequently warp or crack from engine heat. Improper installation, such as a pinched O-ring seal or over-tightened bolts, is also a highly common cause of leaks here.
The plastic expansion tank degrades over time and develops hairline cracks. It typically leaks coolant when the system is pressurized and hot, dripping down the inner fender or engine bay.
A severe engine failure where the head gasket fails at the outer edge, allowing coolant to leak externally down the side of the engine block rather than into the cylinders.