Question about 1998 Dodge Durango

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Signs that the fan clutch is going bad

What would be some signs that the fan clutch is going bad?

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Grab fan at mount where blades attach and try wiggling side to side, up & down, should be no play,as well as spin it slowly holding same and feel for roughness or binding slightly. It should turn tight & smooth.

Posted on Sep 10, 2009

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Posted on Jan 02, 2017

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My 1999 ford RAnger has heat but the fan makes alot of noise and does not blow out the heat and the trucks gauge will go hot. What would the issue? Heater core or mayb just the fuse?


Diagnose Cooling Fan Clutch On engines with belt-driven cooling fans, a fan clutch is often used to save energy and reduce noise. The fan clutch disengages slows or disengages the engine's cooling fan when extra cooling isn't needed. The fan pulls air through the radiator and air conditioning condenser when the vehicle isn't moving fast enough to provide adequate airflow for cooling. A fan can eat up anywhere from a couple of horsepower up to 12 or 15 hp on a big V8, so by reducing the parasitic horsepower loss on the engine the fan clutch makes a noticeable difference in fuel economy

TWO TYPES OF FAN CLUTCHES basic types of fan clutches: thermal and non-thermal (also called "torque limiting Thermal fan clutches have a temperature-sensitive bimetal coil spring on the front that reacts to temperature changes. When the air coming through the radiator is hot, the spring expands and opens an internal valve that reduces clutch slippage. This causes the fan to spin faster for increased cooling. As the air cools, the spring contracts and closes the valve. This increases the amount of clutch slippage, allowing the fan to slow down and decrease cooling FAN CLUTCH OPERATION

The clutch consists of a fluid coupling filled with a silicone based oil. In the cutaway view at the left, the area between the teeth on the clutch plates is filled with silicone fluid. An internal valve opens and closes a passage between the main fluid cavity and a fluid reservoir. When the passage is open, fluid enters the clutch and makes the fan to turn faster. When the valve is shut, fluid flows back to the reservoir but doesn't return, causing the clutch to slip and the fan to turn more slowly.
The non-thermal (torque limiting) fan clutch doesn't have a temperature sensing capability. It reacts only to speed, slipping to limit maximum fan speed to about 1200 to 2200 rpm depending on the application.

FAN CLUTCH PROBLEMS

A slipping fan clutch is often overlooked as the cause of an engine overheating problem.
As a fan clutch ages, fluid deterioration gradually causes an increase in slippage (about 200 rpm per year). After a number of years of service, the clutch may slip so badly that the fan can't keep up with the cooling needs of the engine and the engine overheats. At this point, replacement is often necessary.
Other signs of fan cluch failure would include any looseness in the clutch (check for fan wobble), or oil streaks radiating outward from the clutch hub.
If the clutch is binding, the fan may not release causing excessive cooling and noise, especially at highway speeds

CHECKING THE FAN CLUTCH

A good clutch should offer a certain amount of resistance when spun by hand (engine off, of course!). But if the fan spins with little resistance (more than 1 to 1-1/2 turns), the fan clutch is slipping too much and needs to be replaced.
If the fan binds, does not turn or offers a lot of resistance, it has seized and also needs to be replaced.
Fan speed can also be checked with an optical tachometer, by marking one of the fan blades with chalk and using a timing light to observe speed changes, and/or listening for changes in fan noise as engine speed changes.
You should also try to wiggle the fan blades by hand. If there is any wobble in the fan, there is a bad bearing in the fan clutch, or a worn bearing on the water pump shaft. A bad water pump bearing will usually cause the water pump to leak and/or make noise, but not always. Remove the fan clutch and see if the play is in the water pump shaft. If it feels tight (no play or wobble), replace the fan clutch.

FAN CLUTCH REPLACEMENT

Many experts say it is a good idea to replace the fan clutch at the same time as the water pump if the water pump has failed. The reason is because both age at about the same rate, so if the water pump has failed, the fan clutch may also fail soon. As as we mentioned earlier, a high mileage fan clutch may be slipping excessively increasing the risk of overheating.
When you buy a replacement fan clutch, make sure you get the same type (thermal or nonthermal) as the original. You can always upgrade from a nonthermal to a more efficient thermal fan clutch, but never the reverse. Or, you can get rid of the fan and clutch altogether and install an aftermarket electric fan kit to cool the radiator.

Sep 28, 2016 | Ford Cars & Trucks

1 Answer

Why is 06 international 4300 fan clutch engaged all the time


Is it a air clutch fan a bad a/c switch can cause this or bad solenoid or wires or ECM circuit now if it's still old school no air line going to the fan hub just change the fan hub it is seized

Jul 09, 2014 | Dodge Ram Pickup 3500 Cars & Trucks

1 Answer

Car running hot


check your water. if it is winter and you running your heat, then it could be your heater core. a sure sign is a wet passenger floorboard.

also check your radiator hoses. both should be hot. if one is not hot, then you have no coolant flow.

check your oil. milky, dirty white oil is a sign of a blown head/headgasket. water mixes with oil and it makes a distinct color.

if all that checks out, then check your fans. FOR ELECTRIC FANS ONLY: let the car warm up, start getting to a normal temperature (may have to drive it), and then stop and pop the hood. if you do not see a fan moving, then you have a bad relay (common) or a bad fan motor (not so common).

FOR CLUTCH FANS: there is no real way to test them. if all the steps before have turned out to be ok and normal, then you need your clutch on your fan replaced. most of them are on bigger v8s and RWD cars.

Jan 27, 2013 | Cars & Trucks

1 Answer

2004 Trailblazer Left it runing for 2-3hrs, woke up engine off with ac giving hot air. Way home service engine came on. Codes for bad thermostat or bad heat sensor, but frirnd believed iy migjt be fan...


Suggest changing thermostat and temperature sensor, they are right next to each other and are relatively inexpensive. Whoever does the repair should disconnect the battery during the repair to reset the computer.
The fan clutch will usually not engage fully until the engine is really hot, somewhere around 250+ deg.

Jul 09, 2012 | 2004 Chevrolet TrailBlazer

1 Answer

My jeep is overheating when stop i change the fan relay head gasket put new radiator and keep overheating when i stop in the lights


It's easy to overlook but a bad clutch fan will cause overheating in stop & go traffic, while you're idling or out on the trail at low speeds. When you rev the motor, you should be able to hear the clutch fan 'roar' up to speed slightly behind your engine speed. It's a noticeable sound when it's fixed, but ya don't pay any attention to it if it has slowly gone bad... other than wondering why you're overheating.
CHEAP "FIX" #1: If your clutch fan is known to be bad, you can remove it and drill two small holes in it where the internal spring is located and put two sheet metal screws in to make it 'lock up' all the time. Put these 180* apart, directly across from one another to keep things balanced. Upside: .20 cents to fix. Downside: Reduced gas milage with it going all the time.
CLUTCH FAN REPLACEMENT UPGRADE: Pull out the clutch fan and use it to enhance your garage wall. Instead of putting in another clutch fan, you can free up some horsepower when you install another electric fan for primary cooling

Jul 18, 2011 | 2000 Jeep Grand Cherokee

1 Answer

My 1998 vw jetta clutch is having a problem. there was no signs of clutch slipping. clutch pedal went to floor, now there is no going and no sign of a broken cable.


You might need a new clutch attachment kit... there is a clip that usually goes bad and causes the cable to float.(No tension)

Feb 12, 2011 | 1998 Volkswagen Jetta

1 Answer

When trailblazer is on, i hear a loud squeeking sound. when checking engine i noticed that the radiator cooling fan and pulley move up and down. does not seem to be wobbling at all just moving up and down....


Sounds like your fan clutch is going bad. If you can move the fan by hand then I recommend changing the fan clutch. If it completely fails your fan will be shot through your radiator.

Apr 22, 2010 | 2004 Chevrolet TrailBlazer

2 Answers

The fans do not work and the vehicle starts to over heat


With mechanical fans, most overheating problems are caused by a faulty fan clutch - though a missing fan shroud can reduce the fan’s cooling effectiveness by as much as 50 percent (depending on the fan’s distance from the radiator), which may be enough to cause the engine to overheat in hot weather or when working hard.

Defective fan clutches are a common and often overlooked cause of overheating. The shear characteristics of the clutch fluid gradually deteriorates over time, with an average loss in drive efficiency of about 200 rpm per year. Eventually slippage reaches the point where effective cooling is no longer possible and overheating results. (On average, the life of a fan clutch is about the same as a water pump. If one needs to be replaced, the other usually does too.)


If the fan clutch shows signs of fluid leakage (oily streaks radiating outward from the hub of the clutch), spins freely with little or no resistance when the engine is off or wobbles when the fan is pushed in or out, it needs to be replaced.


With an electric cooling fan, check to see that the fan cycles on when the engine gets hot and when the air conditioner is on. If the fan fails to come on, check the fan motor wiring connections, relay and temperature sensor. Try jumping the fan directly to the battery. If it runs, the problem is in the wiring, relay or sensor. If it fails to run, the fan motor is bad and needs replaced.

Hope help with this.

Mar 12, 2010 | 1999 Dodge Grand Caravan

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