Sweetness means trouble. Beneath a hot hood, vaporized ethylene glycol can drift from a coolant leak, and its syrupy scent may arrive before the temperature gauge tells the fuller story. The breach can sit in a hose, radiator, water pump, or heater core; falling coolant reduces the system's ability to carry heat away. A wet patch may be absent because fluid can boil off on metal. Do not shrug.Burn...More