03 Cavalier overheating

Asked by GuruHPK6P Aug 01, 2019 at 11:21 AM about the 2003 Chevrolet Cavalier

Question type: Maintenance & Repair

Changed water pump and thermostat.  Still overheating

1 Answer

89,255

You definitely have a coolant temperature problem. Overheating can be caused by several things. A broken water pump, sticking thermostat, clogged radiator, collapsed hose, bad radiator cap, air in cooling system. Could be a defect in the cooling fan system causing the fan not to operate when needed. There could even be mechanical issues with the engine that cause this. Start by checking coolant flow. Is the top hose hot? if not it's the thermostat. If it is, with radiator cap off see if there is flow. If not, it's the radiator. If flow, purge air from the system (videos on line explain this simple procedure). This covers 90% of overheating problems.

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