What does a viscous fan do? Viscous fan couplings are located between the water pump pulley and the radiator. They: Control fan speeds to aid engine cooling. Aid in the efficiency of the engine by engaging the fan, when necessary.
What is the function of viscous fan? What Is a Viscous Fan Drive
How do I know if my viscous fan 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.
How do I know if my viscous fan is working? When your motor is hot, you should be able to hear the fan kick in. If you can’t, pop the bonnet, and turn the vehicle off while watching the fan. If it comes to a fairly abrupt stop, the fan hub is working properly. If it keeps spinning round and round, your fan hub is knackered and needs to be repaired or replaced.
What does a viscous fan do? – Related Questions
Should a viscous fan spin freely?
The fan should move freely by hand when the vehicle is off. Any strong resistance means its locking up.
How do you remove a viscous fan?
put spanner on viscous fan, hit with soft mallet in clockwise direction and it will eventually loosen.
When you whack the spanner and the water pump just turns – curse a bit and tighten the fan belt.
Then when it does nothing – whack it harder.
Can a faulty viscous fan cause overheating?
Viscous fan couplings are used on vehicles (cars and trucks) with inline engine positions, mainly rear wheel drives. These fans are needed at slow speeds and while idling. A faulty fan can cause an engine to overheat while idling or in heavy traffic, or poor mileage and loss of horse power.
Should a fan clutch spin freely when cold?
If you try to spin the fan, the fan is tight and will not spin freely even when cold. In fact, it’s just as tight when it’s cold as it is when it’s hot. If the fan rotates more than five times, you can bet the clutch is bad.
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”.
What temperature does a fan clutch engage?
about 170°F
At what temperatures do fan clutches engage
Is an electric fan better than a clutch fan?
When compared to an electric fan, fan clutches are quite inefficient.
The benefits of a Thermatic Fan lay in its ability to provide constant air flow, improved fuel economy, better air-conditioning performance, cooler engine running and increased engine power.
Do radiator fans always spin?
This unit spins when the engine is running, and it always spins at the same rate as the engine. The faster the engine is running the faster the fan will spin. The reason that the fan does not have to work at these higher RPMs is that there is enough air coming in over the radiator that will be able to cool the engine.
What does a bad fan clutch 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.
Why is my clutch fan so loud?
Excessively loud cooling fans
Will a fan clutch tighten itself?
it will tighten itself down just fine.
Is 7.3 fan reverse thread?
yes it is reverse thread. The belt will hold tension on the pulley so you can get the nut off. You can rent the tool, or buy one, or make one out of flat bar stock to get the big, thin, nut off.
What are signs of a bad water pump?
Five Signs Your Water Pump Is Failing
Overheating. A dead or dying water pump cannot circulate coolant through your vehicle’s engine and, as such, the engine will overheat.
Coolant Leaks. Coolant leaks from the water pump are common and a clear sign that it’s time to replace the pump.
Corroded Water Pump.
Whining Noises.
What is a viscous fan drive?
Viscous drives control how fast an engine fan spins with remarkable accuracy. Oil is released from a reservoir into grooves that allow for increased or decreased friction depending how much cooling is needed.
Do I need to replace my fan clutch?
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 until engine is excessively hot.
What happens when your fan clutch goes out?
A bad fan clutch may not engage properly or at all, and as a result, will disable the fans or prevent them from working at maximum efficiency. This may result in the engine overheating, which will lead to more serious issues if left unattended.
Why do Clutch Fans roar?
A roaring noise could mean a number of things, including a bad wheel bearing, worn tires, or a differential that’s low on oil. Often times, it’s the fan clutch. When the fan is locked up, the cooling fan is permanently engaged. This causes the roaring noise.
How do you install a clutch fan?
Part 1 of 1: Replacing your fan clutch
Materials Needed.
Step 1: Checking your fan clutch for problems.
Step 2: Remove the fan shroud.
Step 3: Remove the fan.
Step 4: Rock from side to side.
Step 5: Remove the bolts.
Step 6: Install the new fan clutch.
Step 7: Tighten the bolts.
•
What size is the fan clutch nut?
Registered. The fan clutch “nut” is 36 mm. You can use a 1 7/16″ wrench which will be loose but will work, or you can take a 1 3/8″ wrench and grind the open end to fit. (Some places offer cheap wrenches make in China that you don’t mind modifying.)
