Cooling Fan Not Working
Cooling Fan Not Working needs a focused diagnosis because the same symptom can come from several different parts. Start with the checks that match when it happens, then verify the likely cause before replacing parts.
Check These First
Before diving into diagnosis, quickly verify these:
- 1Watch the temperature gauge and warning lights.
- 2Check coolant level only when the engine is cool.
- 3Listen for cooling fan operation at idle with AC on.
- 4Stop if the gauge rises, steam appears, or coolant leaks heavily.
What exactly is it doing?
Pick the description that fits best.
Fan Runs Continuously
MonitorFan Runs Continuously means the cooling system or fan-control circuit may not be controlling engine temperature correctly. Cooling problems can overheat the engine, especially at idle or in traffic.
See causes →Fan Spins Intermittently
MonitorFan Spins Intermittently means the cooling system or fan-control circuit may not be controlling engine temperature correctly. Cooling problems can overheat the engine, especially at idle or in traffic.
See causes →Fan Won't Turn On at All
Fix SoonFan Won't Turn On at All means the cooling system or fan-control circuit may not be controlling engine temperature correctly. Cooling problems can overheat the engine, especially at idle or in traffic.
See causes →Related Symptoms in Cooling
Other problems to check if this isn't your issue.
Coolant Disappearing With No Visible Leak
Fix SoonCoolant disappearing without a puddle means the leak may only happen under pressure, may evaporate on hot parts, may leak inside the cabin through the heater core, or may be entering the engine. This needs diagnosis because low coolant can quickly lead to overheating.
Coolant Leak
Fix SoonA coolant leak means the cooling system is losing the fluid that carries heat away from the engine. Small leaks can become major leaks fast. Low coolant can cause overheating, no cabin heat, head gasket damage, or engine failure.
Radiator Problems
Fix SoonRadiator component malfunction affecting heat dissipation.
Thermostat and Coolant Flow Diagnosis
Fix SoonA hub for thermostat behavior, housing leaks, stuck-open running cold, and stuck-closed overheating.
Engine Running Cold / Heater Problems
MonitorIf the temperature gauge stays in the low or cold range after the engine has been running for several minutes, or if the heater never gets warm, the cooling system is likely releasing heat too early or too much. A stuck-open thermostat is the single most common cause. Other causes include a cooling fan that runs too soon, certain coolant flow restrictions, or a failed coolant temperature sensor that gives a false reading.