Symptom Potential Problem What To Do Temperature warning light goes on, temperature gauge in hot range, engine overheats or engine boils over Low coolant level Top off cooling system with 50/50 coolant mixture Thermostat stuck in closed position Replace thermostat if faulty Radiator blockage (inside or outside) Internal – flush radiator with Prestone Super Flush; if problem persists, see mechanic for repairs. External – Flush external surfaces with air or water. Broken fan belt or fan drive motor failure Check fan belts, replace if broken, worn or slipping; Check for fan operation, replace if necessary; check for electrical failure of electric fan circuit Head gasket leakage Replace head gasket Water pump failure Replace water pump See mechanic if symptoms persist with any of the referenced problems Wet spots or stains in engine, hose connections, radiator, coolant pump or ground under car Cooling system leakage Check cooling system for leaks and repair if necessary Old/worn hose Replace old/worn hoses Old/worn clamps Tighten, replace hose clamps Leaking gaskets Replace leaking gaskets Leaking hose connections Tighten clamp or replace hoses Water pump seal failure Replace coolant pump if leaking Radiator or heater core leak Use Prestone Stops Leaks or Prestone Super Sealer; if leakage persists, see mechanic for replacement of radiator or heater core Low coolant level External or internal leakage See above for external leaks See mechanic for repairs due to internal leaks like head gakets Heater delivers cool air Low coolant level Check coolant level and top off with 50/50 coolant mixture if necessary Thermostat stuck in open position Check thermostat, replace if stuck in open position or opening too soon Heater core blockage Flush heater core; see mechanic if symptoms persist Heater air doors not closing properly See mechanic if symptoms persist Heater air bound Coolant lines must be bled to remove air pockets Engine warms up too slowly Thermostat stuck in open position Change thermostat Dirty/Rusty coolant Low coolant concentration or old coolant Drain old coolant, clean system with Prestone Super Flush or Super Radiator Cleaner, flush system well and fill with fresh 50/50 coolant mixture

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