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5th problem on Fan Clutch !

1553 Views 9 Replies 5 Participants Last post by  acoste
Hello i have Bmw E39 525I 2003 my problem is with the fan clutch for the engine i have change it 5th times and first i bought a new BEHR clutch and tested it works after tow days the clutch stopped from working i have then back to the to shop and replaced it with another new one BEHR and then it works until 3 days and then it is stopped again ! so i have go and bought from the shop a second hand clutch they said it is good than the new one so i have tested it and after 3 weeks it has stopped again but notice that the clutch some times wobble up and some times stopped but when i stopped the engine for a while then start it again it works sometimes ,could you please tell me why the clutch some times work and some times not ?
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Could you describe what you mean under "stopped working"?
Take it to a different shop. Five bad fan clutch's in a row is impossible. They have to be doing something wrong.
i am sure that there is nothing wrong ! but the question is why firstly the fan goes rotation and after a while from driving it stopped and there is increasing on the temperature !?
Take it to a different shop. Five bad fan clutch's in a row is impossible. They have to be doing something wrong.
Then you have an overheat problem, don't blame the fan clutch.

If your mechanic competent?
:) i mean the fan clutch is not rotating !
Could you describe what you mean under "stopped working"?
no i am not a mechanic please :D but please what is causing the overheat ? cause when the fan clutch start rotating the temperature goes to middle !
Then you have an overheat problem, don't blame the fan clutch.

If your mechanic competent?
I think people need more detail about what the fan clutch is doing and is not doing to diagnose whether there is anything wrong with it.

The fan stops moving when your car is idling? It stops moving when you are are at speed? Does this occur when the car is warm (after a 15min/30min/45min drive), when you first start the car, when you are sitting in traffic? Are you saying your temperature gauge is sitting in the middle? Or the temperature gauge is past the halfway mark and when the fan is working it brings it back down to the halfway mark?

As far as overheating in general it could be any one of a number of things causing the problem. The cooling system is composed of the radiator, expansion tank, water pump, thermostat and thermostat housing. All of those components fail over time on the e39. The usual recommended preventative replacement interval is between 60,000 miles and 90,000 miles. It is also recommended that you flush the coolant and replace it with fresh coolant every 2yrs (most recommend BMW coolant to make sure you are getting the correct/compatible stuff for you car). There is also a auxiliary fan and I believe a temperature sensor for that fan.

As someone else said if you keep taking the car to the same shop and they have replaced the same part 5 times, they don't know what they are doing and/or are very unfamiliar with BMWs and the e39. You need to get the car to a quality independent BMW specialist or suck it up and take it to a BMW dealer.
Here is a good description about the fan clutch:

http://forums.bimmerforums.com/forum/showthread.php?t=1703734

shortly:
"The fan (mounted to the water pump) should spin when the engine is on. It will spin faster when first turned on, then slow down as it warms up. Then the speed will vary based on engine compartment temp. Search for "fan clutch" and you find lots of info on them."
quoted from mbell666

Overheating can be caused by loss of water, air in the system, broken water pump impeller, broken belts/pulleys, thermostat, debris in front of radiator, broken auxiliary fan, head gasket issues, clogged water lines.

The engine cooling fan usually breaks the other way, it seizes up and is always running.
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