Fan Problem ?

[ardvark]

A lot of talk has been about these 'ere fans. Please excuse the question but what has been happening with them? Swapping from 3 to 2 speed or vice vera? What advantage would there be going down this route if the worst happens?

Al

[GrahamP]

The original 3 speed fans have 4 carbon brushes, on the commutator when the aircon is on in auto the fan starts in low speed and on the diesels the 2nd and 3rd speeds get very little use, so the low speed carbon brush wears down quicker than the others until it no longer works and you have no aircon.

These motors are no longer available as they were updated to a 2 speed motor with an external resistor wired in to give the low speed. The factory fitted resistor is the weak link in these motors but Jules has sourced uprated ones.

There is a modification that can be done to the old 3 speed to make the 2nd speed come on with the aicon but it won't last very long as the other 3 carbon brushes will be getting towards the end of their life anyway.

So anybody with the old 3 speed fan when it fails it is easier to get a new 2 speed motor with Jules uprated resistor and fit that.

[willster]

There is a modification that can be done to the old 3 speed to make the 2nd speed come on with the aicon but it won't last very long as the other 3 carbon brushes will be getting towards the end of their life anyway.
.
please could you tell me more about the temporary fix to get my old 3 speed fan running , ive just found out its not coming on, even when i shorted out the trinary switch.I cant really afford the new 2 speed at the mo and am off to france in my 75 at the end of next month.cheers

[Simon]

Lot's of information over in our How-To forum. For starters though, have a browse through these threads:

How to Test the High Speed Fan (DIESEL models ONLY) (http://www.the75andztclub.co.uk/forum/showthread.php?t=35577)

Upgrade a 3-Speed fan to a 2-Speed fan (http://www.the75andztclub.co.uk/forum/showthread.php?t=21217)

How-To install a third-party (Kenlowe) Fan (http://www.the75andztclub.co.uk/forum/showthread.php?t=10867)

Lastly, but most importantly (from a sticky in this forum):
Radiator Fans and Description of Correct Operation (all models) (http://www.the75andztclub.co.uk/forum/showthread.php?t=1371)

[willster]

Lot's of information over in our How-To forum. For starters though, have a browse through these threads:

How to Test the High Speed Fan (DIESEL models ONLY) (http://www.the75andztclub.co.uk/forum/showthread.php?t=35577)

Upgrade a 3-Speed fan to a 2-Speed fan (http://www.the75andztclub.co.uk/forum/showthread.php?t=21217)

How-To install a third-party (Kenlowe) Fan (http://www.the75andztclub.co.uk/forum/showthread.php?t=10867)

Lastly, but most importantly (from a sticky in this forum):
Radiator Fans and Description of Correct Operation (all models) (http://www.the75andztclub.co.uk/forum/showthread.php?t=1371)

Thats fantastic,lot of help in those threads. Think il just have to risk the trip to france with no fan, sweat like hell without the aircon and hope i dont overheat! I will fit a kenlowe in the near future.

[stocktake]

I think this is what you are looking for. Uses middle speed of a three speed fan as the slow speed

http://www.the75andztclub.co.uk/forum/showthread.php?t=21885as the