How do I know if my electric fan clutch is bad?
To confirm the diagnosis, start with this simple test: Spin the fan as hard as you can on an engine that has not been started that day. If the fan rotates more than five times, you can bet the clutch is bad. You should feel some resistance and the fan may spin up to three times, depending on the ambient temperature.
Under what circumstances would an electric fan use a fan clutch?
A fan clutch is a thermostatic engine cooling fan that can freewheel at low temperatures when cooling is not needed, allowing the engine to warm up faster, relieving unnecessary load on the engine. As temperatures increase, the clutch engages so that the fan is driven by engine power and moves air to cool the engine.
How does an electric clutch fan work?
A thermal clutch fan operates using silicon fluid as a viscous coupling medium. When the clutch is cool and disengaged, most of the silicon fluid is stored in the reservoir allowing your fan clutch to slip relative to your water pump shaft thereby spinning at a lower RPM than the water pump.
How do I know if I have a fan clutch?
Symptoms of a Bad or Failing Fan Clutch
- Vehicle overheating. One of the first symptoms that is commonly associated with a bad or failing fan clutch is an overheating engine. …
- Excessively loud cooling fans. …
- Decrease in power, acceleration, and fuel efficiency.
Should a fan clutch spin freely?
If the fan throws the screwdriver back at you, then the clutch is good. The fan should move freely by hand when the vehicle is off. The fan should move freely by hand when the vehicle is off. … Answer: Most fan clutches engage at about 170°F air temperature (about 180-190°F engine temperature).
What’s better electric fan or clutch fan?
The electric fan saves power due to no load on the engine…. Clutch fans are better because they only apply a load at idle or low speed and don’t require wiring… Electric fans save power but add weight and require a lot of wiring…
Do electric fans add horsepower?
A key advantage of electric fans is increased engine cooling and improved air conditioning cooling at idle, when it is most needed. In addition, replacing an engine-driven fan can increase horsepower and improve fuel economy as the engine drag from turning the fan is eliminated.
Does a clutch fan run all the time?
Does a clutch fan run all the time? With a fan cluthc your fan will rotate constantly regardless. The clutch engages and locks the blade to it so that it spins faster than normal the hotter that it gets. The only time that your fan will not spin is when the motor is off.
How are electric fans controlled?
The fans are controlled either with a thermostatic switch or by the engine computer, and they turn on when the temperature of the coolant goes above a set point. They turn back off when the temperature drops below that point. … This clutch is positioned at the hub of the fan, in the airflow coming through the radiator.
What does a bad clutch fan sound like?
Usually a bad fan clutch will sound like the fan blades rubbing against the radiator type noise. Or a rattle. … A faulty fan clutch that leaves the fan permanently engaged will not only cause a noisy engine, but can also cause a decrease in performance.
How do I know if my fan clutch is reverse rotation?
Clockwise or counter-clockwise rotation of the fan blade is defined as viewed from the front of the vehicle looking toward the rear. The replacement counter-clockwise fan clutch will be marked “REVERSE”.
How do you check a fan clutch on a Chevy?
Raise the hood, with the engine off and cold. Reach in and spin the fan blade by hand. If it continues to spin freely for more than five turns with no signs of drag, you have a bad fan clutch.
When should I replace my clutch fan?
According to Hayden, here are some signs your fan clutch might need replaced:
- Fan spins excessively when engine is stopped (three or more times when hot engine is shut off).
- Poor A/C performance at idle or low vehicle speeds.
- Fan speed does not increase when engine is hot.
How much does a fan clutch cost?
Radiator Fan Clutch Replacement Cost – RepairPal Estimate. The average cost for radiator fan clutch replacement is between $334 and $357. Labor costs are estimated between $82 and $103 while parts are priced between $253 and $254.