Approximately how much would a clutch fan cost for a bmw 1985?

Question edited for clarity, add MAKER!
Question moved to maker category.

BMW Flywheel Bolts = 100Nm or 74 ft-lbs of torque.
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Can you wiggle the fan front to back when the engine is off? If so, check to see whether it is the water pump or the fan clutch and replace as required....

you need to remove the fan blade and clutch assembly as one with the big nut between the fan and water pump it turns op of engine big wrench and hit with dead blow hammer

If you need further help, I’m available over the phone at https://www.6ya.com/expert/mike_9693b5ad75773352

Go to a local Transmission Supply House,to purchase it.
Ask a trans shop, who they get their parts from and go there.

a shop will charge about $250 and above per door just depending the nature of the problem...

Are you sure the Fan is turning to cool the Engine? If it is not coming on to cool Engine Check the Rad. cooling fan relay.

The fan/clutch assy has left hand thread. Loosen by turning clockwise.

Remove radiator top shroud & air cleaner assy. to gain access.
Remove engine cooling fan by holding the belt drive pulley with a suitable flat bar tool (that fits over the top of the drive pulley attachment bolts), then using a suitable flat spanner to unscrew the fan clutch assy (clockwise). When re-fitting, tighten clutch nut to 30 ftlb.
You may need to use a bit of ingenuity in making the flat bar holding tool, unless you are able to procure the BMW tool #11.5.030.
Good luck

simple kthe fan turns to tight look at the blades fan loosens the way the moyor spins hey if any trouble let me know vote for me on fixya ok

Hi

Yes you need to replace what is called the Fan Viscous Coupling Unit.

Then swap over the fan blades.

Quite straightforward.

Good luck !

John.

Could be a head gasket. If it got hot enough, it could have warped the head. Costs from $1900 - $3000.