Why Is My Coolant Low? Complete Diagnostic & Leak Guide
Your coolant is low primarily due to an external fluid leak, an internal engine leak, or normal system volume changes over time. Under normal operating conditions, a sealed automotive cooling system naturally loses 0.25 to 0.5 quarts (approx. 250 to 500 mL) of fluid annually through microscopic evaporation across rubber hoses and pressure cap venting. […]