Fan wiring advice

[rovexCDTi]

Following on from previous threads about the fans and wiring, here is my replacement 2 speed fan control box. Will this one need rewiring to work with my 3 speed car?

[wuzerk]

On the diesels the 2 speed fan with control box is a direct plug and play replacement for the 3 speed type but if you mean that you have a 2 speed box with the original 3 speed fan then I do not know what is involved.

[rovexCDTi]

This is where its getting really confusing.

Its a diesel 3 speed car and im fitting a diesel 2 speed fan assembly, control box and all.

Some are saying its plug and play, others are saying you need to rewire, others are saying you might need to rewire. I think we need a sticky that clears this up because there are a lot of messy threads that are confusing things.

Surely if there are only 2 different fans there should only be one answer!

[Arctic]

Following on from previous threads about the fans and wiring, here is my replacement 2 speed fan control box. Will this one need rewiring to work with my 3 speed car?

Hi Christian.
The above fan in your pic looks to be one of the newer fan motors that is doing the rounds and is plug and play, ;) i will later pop some photo's of the control boxes and wires so you can get some idea of what some members come across without trying to make it to complicated.

[rovexCDTi]

Thank you. So there arent just 2 types then?

[Arctic]

Thank you. So there arent just 2 types then?

Well yes in theory, but with the new ones being put together the wiring is a little different in your case the fan you have aquired will fit and plug and play.

As i have the thread live in another place i will just pop up here the diesel ones i have photo's of becuase it is an ongoing work in progress project, once finshed i will post it on this forum.

Three speed 4 wire fan control box which you are going to replace.
http://i39.tinypic.com/2nvmud.jpg1

Two speed 2 wire what you are replacing your old one with but your one is not OEM as this factory one below.
http://i39.tinypic.com/1j9d9k.jpg2

Then you have your fan and control box the newer wiring not factory OEM which are used in petrol and the diesel but altering the wiring to suit.
http://i42.tinypic.com/156zpqg.jpg3

Here i have used a petrol spurious control box but changed the wiring so it can be used for either a petrol or diesel note the yellow wire with black tape on it, also not in your control box as your one already as the black wire, also the blue & grey wires are connected in your box.
http://i41.tinypic.com/16hkso7.jpg4

Then you have the petrol control box which can be used in conjuction with your old three speed control box with the wiring altered but that is another solution

[rovexCDTi]

Its 2 and 3 that are confusing me and others I think. Lets see if I have this right..

1 is a stock 3 speed diesel unit.

2 is a 3 speed adapted to work with a 2 wire fan. Its this one people are talking about when they say you may need to switch the red and grey wires.

3 is a stock 2 speed diesel unit, which is is plug and play replacement for a 3 speed unit if using the whole assembly.

4.. well forget 4 for now.

Is that right? If so did 2 ever get fitted from the factory?

[Arctic]

Its 2 and 3 that are confusing me and others I think. Lets see if I have this right..

1 is a stock 3 speed diesel unit.

2 is a 3 speed adapted to work with a 2 wire fan. Its this one people are talking about when they say you may need to switch the red and grey wires.

3 is a stock 2 speed diesel unit, which is is plug and play replacement for a 3 speed unit if using the whole assembly.

4.. well forget 4 for now.

Is that right? If so did 2 ever get fitted from the factory?


2 is a 3 speed adapted to work with a 2 wire fan. Its this one people are talking about when they say you may need to switch the red and grey wires.
The above (2) is a two wire 2 speed fan with silver resistor which was factory fitted to some of the R75 later roughly after 2001 but not always as mine is a 2004 and it still had fan (1) fitted ;) so not always true either.


3 is a stock 2 speed diesel unit, which is is plug and play replacement for a 3 speed unit if using the whole assembly.
The above is the newer type you are going to fit which is spurious not factory

[rovexCDTi]

Ok i checked with Rimmers. In all cases the diesel 3 speed fan is discontinued and they say to use the PGJ000110, which is the 2 wire 2 speed unit. So it is indeed plug and play.

My question is therefore why are people confusing it by rewiring 3 speed boxes and giving the impression they are somehow factory 2 speed unit?

[rovexCDTi]

The above is the newer type you are going to fit which is spurious not factory
Why is it both the later 2 speed and spurious? The one im fitting, in the picture i posted is a stock unit from a 2004 Rover 75 diesel.. :shrug:

[Arctic]

Why is it both the later 2 speed and spurious? The one im fitting, in the picture i posted is a stock unit from a 2004 Rover 75 diesel.. :shrug:

I have yet to see one of these below fitted as stock, maybe the car you got it from had had the fan fitted after its three speed four wire failed :shrug: who knows as i stated i have seen 04/05 diesel with three speed four wire fans ;)

but i doubt very much this is a factory fit control box /fan which you are fitting more likely to be the one in the fleabay link below
http://i42.tinypic.com/156zpqg.jpg

http://www.ebay.co.uk/itm/NEW-ROVER-75-MG-ZT-ZT-T-FAN-MOTOR-DIESEL-ENGINE-OE-QUALITY-/321164819239?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item4ac6ea3b27#ht_1055wt_1083

[rovexCDTi]

That IS a standard 2 speed diesel unit, as also sold by Rimmers. Part number PGJ000110 Genuine MG Rover.. The one in the ebay link does look like a cut and shut of some sort, but mine looks like the one listed below. It has all the wire covered in a conduit like the one below.

http://www.rimmerbros.co.uk/Item--i-PGJ000110

[Arctic]

That IS a standard 2 speed diesel unit, as also sold by Rimmers. Part number PGJ000110 Genuine MG Rover.. The one in the ebay link does look like a cut and shut of some sort, but mine looks like the one listed below. It has all the wire covered in a conduit like the one below.

http://www.rimmerbros.co.uk/Item--i-PGJ000110
Christian either way it will fit and should be plug and play, what does it have on the control box lid M47 or PWM2 or none of these

[rovexCDTi]

Theres much on the lid. I have asked the owner of the car if the fan was replaced, he said it hadnt. Rimmer said that my control box is the same as the units they sell. I can only assume that the type I have is the later type only available from 2004 onwards.

[Arctic]

Theres much on the lid. I have asked the owner of the car if the fan was replaced, he said it hadnt. Rimmer said that my control box is the same as the units they sell. I can only assume that the type I have is the later type only available from 2004 onwards.

Ok Christian.
Lets go with that then all you need to do is fit it and see if it works all the best Arctic. :)