Here is a more detailed list of the signs of a bad or failing radiator cap to look for: 1.
If your coolant is low, that can be a sign that the radiator cap is bad. You may also notice dried white streaks on the radiator coming from the cap. The most common symptom of a bad radiator cap is coolant leaks under the radiator. Radiator Cap Replacement Cost Symptoms Of A Bad Radiator Cap
