Question about 2006 Suzuki XL-7

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The fan make extra noise when I speed the car. I dont know if is the clutch fan? This is not everytime only sometimes.

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Usually, noise coming from the fan is really from the worn bearings of the water pump.

Posted on Aug 10, 2009

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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

What would cause my radiator fan to run really loud but my escape is not overheating


if it has a viscous fan hub ( fan clutch) then the fan will hook up when the radiator temp reaches around 95 degrees C
this coupling increases the fan speed to close to engine rpms and there will be fan noise as it sucks air through the radiator
it prevents overheating by moving extra air through the radiator when there is insufficient road speed to do the job
it is most noticeable when in slow traffic , sitting at lights or with engine rpms high and under load but not noticeable at highway speeds

Nov 07, 2015 | Cars & Trucks

1 Answer

Isuzu Trooper fan clutch not working as it should?


Its very possible the fan clutch has locked up and is now a direct connection from the fan to the water pump.
Depending on if it is controlled by temp or speed, it may not run at full speed when cold or at idle.
When the engine is cold and not running, a normal fan clutch would let you turn the fan blade without turning the pulley.

Oct 01, 2012 | 1991 Isuzu Trooper

1 Answer

Noisey sounds from under the hood when starting car


If it is a rattling sound the starter may be loose, the starter bendix gear might be damaged.

If it sounds like a fan, it is likely the cooling fan.

If it is squealing, it is the serpentine belt. The idlers may be worn, their bearings may be dry- they make a chirping sound at slower speeds when they are dried out. Replacement is the best option.

Air pumps can sometimes make a thumping sound, and if certain emissions valving rusts through, it can be outright exhaust noise.

If it is a high pitch whine, that is usually the alternator. It is not a good sign when they begin to whine. Alternator bearings can also fail, and the sound varies.

Water pumps and fan clutches can also fail and they tend to make softer sounds. These can be checked by checking for radial play in each item with and without serpentine belt tension applied.

Jan 18, 2012 | Cars & Trucks

1 Answer

I have a 2002 Mercury Mountaineer v8 and I want to know why when I am on the interstate at 60 mph or higher, my truck starts to roar.


Does it "roar" all the time? It could be the fan clutch engaging and the radiator fan spinning at full speed. Watch the temp gauge and the RPM's when it does this..the RPM's should stay the same and the temp gauge should go down. I would also check your coolant level as low coolant cause the engine to run hotter and at highway speed the water will circulate faster making the fan clutch engage due to the extra heat.

Jul 12, 2011 | 2002 Mercury Mountaineer

1 Answer

I have a lincoln ls 2002 and a few days ago i was driving it and the fan came on and it was very loud and now everytime i drive it the fan comes on and stays on acting as if it was connected directly..what...


there is a heat sensor that turns fan on when motor temp is to high. ( providing this is a electric fan ) Check coolant level and make sure full as well as the reservoir.Check when engine is cold ( i suggest taking vehicle in for repair or check for temp sensor failure.) I dont know how very loud you are trying to point out but yes it will make a fan noise which might be loud to some. If this fan is a clutch fan then a mechanical funtion takes place turning fan on and off in essence. If clutch is not releasing fan will pull air at all times which also will be like a loud fan sound which will also rob car of some power and mpg. clutch will have to be replaced. ( note the electric fan will not rob car of power or mpg.

Jan 10, 2011 | Lincoln LS Cars & Trucks

1 Answer

I have a GMC 2003 Envoy, each time i drive it sounds like im speeding but im going really slow , i need to change the oil could this affect that and what do i do about the sound


Difficult to know what sounds like speeding: engine, road noise, what ?

If the oil change were to help, you have bad, bad engine problems. I suspect you may have a wheel bearing that may have failed. This makes a lot of road noise, alters with vehicle speed and NOT engine speed (drop to idle, noise the same).
There is a possibility of transmission slipping. this lets your engine speed up, but not actually move the car.

There is a third common issue and that is FAN. When your fan clutch fails, is locks up a normally free spinning (somewhat) fan, as if the vehicle needed max cooling... This noise follows engine speed, the vehicle seems to go just fine, but huge noise.... This sometimes is called Jeep fan noise, as many of those used to have direct drive fans.... If this is your case, the fan clutch gets replaced, not huge $, but more than it should be.

Nov 27, 2010 | 2003 GMC Envoy

1 Answer

My acura legend 1990 jumps out of second gear and sometimes wont get in gear.just sart makin a loud noise but gets quit when i clutch in .i think its my clutch thats goin out but dont know


Probably your synchros in the transmission, if so it's cheaper to replace the tranny with a known good/tested junkyard trans.

If it was your release bearing on your clutch you would hear a ringing noise when you push the clutch in to release it.

If the car is in overall good shape you might consider changing the trans and installing a new clutch kit, it will come with the bearings, etc. Be prepared to lose a gear completely and you'll have to skip that gear during your shifting order to get up to speed.


Oct 01, 2009 | Acura Legend Cars & Trucks

1 Answer

97 vw golf


i have a 1997 Golf GTI 2.0 liter engine the motor was replace and has 40,000 on it but the body has close to 150,000 on it everytime i shift 1st to 2nd somethings hitting the ground somewhere and secondly the intake maniflold has like a rattle in it or something of that sort and i dont know where its coming from its sounds like a missfire but im not 100% sure yet can someone help me and oo and 4th and 5th gear the clutch makes a biut of grinding noise like not loud and only when your fully in gear and the clutch is all the way out any ideas

Apr 17, 2009 | 1997 Volkswagen Golf

2 Answers

Loud air intake engine noise on startup


If the vehicle has a clutch fan, verses an electric fan, sometimes the clutch will spin the fan too fast or at erratic speeds. I'm not saying that's what it is, but just one possible reason. Seeing how you have the warrany, I would take it in and not leave until they have remedied the problem. Let us know how everything turns out and good luck.

Aug 23, 2008 | 2004 GMC Envoy

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