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What type of radiator fan does my 2000 Audi A6 2.7T have - electric or viscous? How do you know when it does not work?

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  • Yuri Grant Roper Jul 08, 2010

    I have an overheating problem that looks like it could be the fan. I want to know if I have an electric fan or viscous fan on my 2000 AUDI A6 2.7T Tiptronic.

  • Yuri Grant Roper Jul 09, 2010

    The radiator fan when it is moving you can stop by hand and rotate it in both directions. Would this be the viscous coupling?



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Hi you should have twin electric fans on this model, you should know when these work as if they did not your car would definitely overheat, what you need to do to make sure these are working is start your car lift hood/bonnet look at the front where the radiator is, you should see both cooler fans, let the vehicle idle until it gets to half way on the temperature gauge, when it goes over a tad the fans should then cut in, if it goes way over and still no fans cutting in then you have a problem, this could be a couple of things, thermostat could be u/s or fan switch could be u/s it is very rare that it would be the fans going u/s hope this helps

Posted on Jul 08, 2010

  • steve morris
    steve morris Jul 08, 2010

    hi grant
    just a follow up, if you find the fan's both work, you can try seeing if it is the thermostat, after car has idled for a while, and is up to temprature, feel the hoses going to the radiator, if the bottom hose is only warm and the top hose is very hot, then this will be the thermostat, if they are both very hot then thermostat is ok, if fan's still not engaged and the hoses are both hot, this might be the radiator switch , this is the sensor on the side of the radiator with the wires in it...hope that helps a bit more

  • steve morris
    steve morris Jul 09, 2010

    hi yes it is, but your model should have twin electric fans not the viscus type, i will investigate more but the viscus fans for your modle ended early 1999, not late 1999 or 2000, i know its a close date but either they fitted this as they still had some left, or the model year is wrong...


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Electric. Here's one

Posted on Jul 08, 2010

  • 1 more comment 
  • Yuri Grant Roper Jul 08, 2010

    Hi. That is for a 2.8L, I have the 2.7T V6 twin turbo Tiptronic motor.

  • Azrael SRL Jul 08, 2010

    Read this

    It clearly says  - thermostatically controlled radiator fan - it means it has an electric fan controlled by a thermostat. And the one i recommended is the one installed in your car.Want another one?

  • Azrael SRL Jul 09, 2010

    The fan is powered by a small electric motor, of course you can stop it by hand and ever turn it the other way around. The only type to which you can't do that is the old fashioned one - directly belt driven by the engine and AUDI's never had one like it.



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I v checked the cooling system, no leaks, new water pump, water pipes solid, changed cyl. head gasket, new radiator cap, checked water level, oil level, fan working, water circulating.

no car make or model mentioned so getting an answer is hit and miss
however what you describe indicates a fan drive problem so if it is electric fan cooled-- check the fans for full blade speed ( weak motor operation) or if viscous fan hub ( fan clutch) replace the viscous hub
it is all about moving air through the radiator when the vehicle speed is slow and the engine rpms are high
if the fan is not doing the job of pulling air through the radiator , the car will overheat
at highway speeds the ram action of the air flow virtually makes a fan useless as there is more than enough air passing through the radiator to cool the water
Im guessing here but I suspect that you have a viscous fan hub

Mar 27, 2017 | Cars & Trucks

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If my radiater is patched and my car still over heats is it the fhermastat or radiater that needs replacing

I would start at the radiator
patching closes of cores and if it is old then there will be more blocked cores
you should mention the make year and model and if you have electric fans or viscous fan hub in you question

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Timing, both valve and ignition. another thing i would recommend is not to make the fan a solid drive, more beneficial to fit electric fan on a thermostat to assist the viscous fan, a few more ideas is an oil cooler on the transmission and possibly have your transmission adjusted. when I changed the tranny in my ford cured my heating problem

Dec 04, 2013 | Cars & Trucks

1 Answer

Gets hot and runs very rough when idling as if its about to stall, cools down as I drive.

Check that the cooling fan is working of if you have a viscous fan hub check that it is operational. Electric fans should be working at around 80 degrees C and just because the viscous fan is spinning doesn't mean that it is driving to pass enough air through the radiator. The statement "it cools down when I drive" is a clear indicator that there is no air passing through the radiator at idle and by driving- the air is being forced through the radiator so it is cooling down

Sep 06, 2013 | 1995 Toyota Camry

1 Answer

Jeep still overheating after changing the water pump, thermostat and radiator

Have a compression test done on the engine to check for gasket/head problems.. If you have a viscous fan hub then check that it is driving the fan while idling or if electric fans check that they are working properly. Make sure that the correct ratio of anti-boil--anti-freeze is in the water that is in the system. If you have an auto run fault codes and check for servo/sensor failure and O-drive is working.

Aug 26, 2013 | 2000 Jeep Grand Cherokee

1 Answer

1996 olds aurora runs hot when idling or low speed normal at fast speed what could the problem be

If you have a viscous fan hub The one where the fan spins free on the water pump then the symptom you describe is a result of it not working any more. With the engine cold start the engine and run at around 2000rpm If the fan is working properly you will hear the air noise from the fan for a few seconds then the noise will dissapear as the fan slows down. When the engine is hot viscous fluid ( silicon ) is pumped from one side in the fan hub to the other creating drag which makes the fan spin and draw air through the radiator. If this is not happening then the fan is stalled by the load of trying to move air and as such the temp rises. As you move off the air flows through the radiator and the fan becomes useless until you stop again. Noemal fix is a new viscous hub. If you have electric fans check that they are working as planned

Jan 11, 2013 | 1996 Oldsmobile Aurora

1 Answer


the one on the engine is probably a viscous type fan.It spins freely until the heat causes it to 'stiffen' up and assist in drawing heat off the radiator.Prior to this it is not needed and would only rob engine power and slightly affect fuel economy.Easy way to check if it is viscous,with engine off,just spin the blades.It should spin with a little resistance onlyThe electric fan on the radiator is switched on by a temp sensor or by using the air cond(unless it has another for this task).Hope this helps you.

Apr 11, 2011 | Dodge Ram Pickup 1500 Cars & Trucks

1 Answer

I have replaced my 92 toyota pickup with new thermostat, heads, water pump,and radiator and it is still getting hot

When they come into my shop like this I check several things.First I check with a temperature gun whether it is actually getting hot( a gauge fault)Maybe your local garage may have one and check for you.If it is heating, as it approaches the fan cut in speed I check for operation of the fan.Electric fans usually can be tested by removing plug near thermostat housing or grounding this should turn on.If you have a viscous fan type(it is bolted to the front of the water pump and free wheels).This should begin to spin faster as the heats causes the viscous to bind.On this type you should feel the heat getting pulled off the radiator and fanning back past the engine and underneath the vehicle.Also ensure if there is a shroud that encompasses the fan and the radiator.Without this on, certain models can not draw heat off the radiator effectively.
Note also if you have air conditionally this should either turn on the electric fan also or switch on an auxillary fan located either beside it or behind the grille.
The fourth item checked is the lower radiator hose.Ensure as holding the revs at cruise speed that it doesnt flatten closed.This can be caused by going soft,or a restriction in the cooling system circuit,but you have indicated that the radiator has been replaced(I am assuming it is a new one)
Hope this helps or get back with your findings and we will work further on it.

Mar 27, 2011 | 1992 Toyota Pickup

1 Answer

How do i change a water pump on 1996 grand cherokee limited V8

I'll assume you have a 4.0l

The 4.0L engine is equipped with a reverse rotation (counterclockwise) water pump. The word REVERSE is stamped or imprinted on the cover of the viscous fan drive and on the inner side of t he fan. The letter R is stamped onto the water pump impeller. When replacing water pump, ensure proper pump is installed. Installation of the wrong water pump will cause engine overheating.

NOTE:On models with 4.0 L engine, front grill must be removed to access radiator draincock. Draining cooling system can be accomplished by removing drain plug from side of block as well as by loosening radiator draincock. Drain plug is located on lower left side of engine block.

Disconnect negative battery cable. Drain cooling system. Disconnect electric cooling fan connector. Remove electric cooling fan and electric fan shroud assembly (if equipped).
Loosen, but do not remove, 4 water pump pulley-to-water pump hub bolts and 4 viscous fan-to-idler pulley nuts. Remove accessory drive belt. Remove 4 viscous fan to idler pulley nuts, and remove fan and shroud together.
Remove 4 water pump pulley bolts and remove pulley. Remove power steering pump and bracket. Disconnect heater hoses and lower radiator hose at water pump. Remove 4 water pump retaining bolts. Remove water pump.

to install just reverse procedures

Apr 05, 2010 | 1996 Jeep Grand Cherokee

1 Answer

Changing the water pump on 2000 Jeep Grand Cherokee V6

The water pump is bolted directly to the engine timing chain case/cover.

A gasket is used as a seal between the water pump and timing chain case/cover.

If water pump is replaced because of bearing/shaft damage, or leaking shaft seal, the mechanical cooling fan assembly should also be inspected. Inspect for fatigue cracks, loose blades, or loose rivets that could have resulted from excessive vibration. Replace fan if any of these conditions are found. Also check condition of the thermal viscous fan drive. Refer to Viscous Fan Drive in this group.

The water pump can be removed without discharging the air conditioning system (if equipped)

Disconnect negative battery cable from battery.
Drain cooling system. Refer to Draining Cooling System in this group.
Do not waste reusable coolant. If solution is clean, drain coolant into a clean container for reuse.

The thermal viscous fan drive is attached (threaded) to the water pump hub shaft. Remove fan/viscous fan drive assembly from water pump by turning mounting nut counterclockwise as viewed from front. Threads on viscous fan drive are RIGHT HAND. Using special tool spanner wrench 6958 with adapter pins 8346 and a suitable fan wrench loosen the fan drive Viscous Fan and Fan Drive Do not attempt to remove fan/viscous fan drive assembly from vehicle at this time.

CAUTION: A number or letter is stamped into the tongue of constant tension clamps. If replacement is necessary, use only an original equipment clamp with matching number or letter.

If water pump is being replaced, do not unbolt fan blade assembly from thermal viscous fan drive.
Remove two fan shroud-to-radiator nuts Fan Shroud Mounting Hardware Do not attempt to remove fan shroud at this time.
Remove fan shroud and fan blade/viscous fan drive assembly from vehicle as a complete unit.
After removing fan blade/viscous fan drive assembly, do not place thermal viscous fan drive in horizontal position. If stored horizontally, silicone fluid in viscous fan drive could drain into its bearing assembly and contaminate lubricant.
Remove accessory drive belt as follows: The drive belt is equipped with a spring loaded automatic belt tensioner. Relax tension from belt by rotating tensioner clockwise (as viewed from front) Automatic Belt Tensioner - When all belt tension has been relaxed, remove accessory drive belt.
Remove lower radiator hose clamp and remove lower hose at water pump.
Remove seven water pump mounting bolts and one stud bolt
CAUTION: Do not pry water pump at timing chain case/cover. The machined surfaces may be damaged resulting in leaks.

Remove water pump and gasket. Discard gasket.
Clean gasket mating surfaces.
Using a new gasket, position water pump and install mounting bolts as shown. Water Pump Installation - Tighten water pump mounting bolts to 54 N·m (40 ft. lbs.) torque.
Spin water pump to be sure that pump impeller does not rub against timing chain case/cover.
Connect radiator lower hose to water pump.
Relax tension from belt tensioner Automatic Belt Tensioner - Install drive belt
CAUTION: When installing the serpentine accessory drive belt, belt must be routed correctly. If not, engine may overheat due to water pump rotating in wrong direction. Refer to Belt Routing for correct belt routing. Or, refer to the Belt Routing Label located in the engine compartment. The correct belt with correct length must be used.

Position fan shroud and fan blade/viscous fan drive assembly to vehicle as a complete unit.
Be sure the upper and lower portions of the fan shroud are firmly connected. All air must flow through the radiator.
Install two fan shroud-to-radiator nuts Fan Shroud Mounting Hardware
Be sure of at least 25 mm (1.0 inches) between tips of fan blades and fan shroud.
Install fan blade/viscous fan drive assembly to water pump shaft.
Fill cooling system. Refer to Refilling the Cooling System in this group.
Connect negative battery cable.
Start and warm the engine. Check for leaks

Jan 10, 2009 | 2000 Jeep Grand Cherokee

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