Radiator fan (2002 HDi)

[rwb]

Picked up my fan today from a really great chap. He'd got an 02 plate HDi 90 too that he'd re-built over 18 months from a Cat C write off. Very knowledgable -- it's a pity he's not on here! And I've now found two people with Planet in Basingstoke!

Anyway, on to changing the fan.

Anybody know how to un-do this connector on the back of the fan?

It looks like it should un-clip in the middle at the left then hinge at the right, but it doesn't seem to. I pulled hard enough to bend the top (which is definitely not joined at the top and bottom) but the sides weren't for budging.

Plan B: cut the wires and re-join to my existing loom. (Anybody want to point me to some suitable connectors?)

[mrh]

...And I've now found two people with Planet in Basingstoke!

Anyway, on to changing the fan.

Anybody know how to un-do this connector on the back of the fan?

It looks like it should un-clip in the middle at the left then hinge at the right, but it doesn't seem to. I pulled hard enough to bend the top (which is definitely not joined at the top and bottom) but the sides weren't for budging.

Plan B: cut the wires and re-join to my existing loom. (Anybody want to point me to some suitable connectors?)

Cannot help with the fan connector I'm afraid (though I replaced buth mine last year on the Coupe - they're different). PM me on the Coupe forum if you need a Planet session.

[rwb]

Opened it! It opens at the other side.



So now how do these come out?

Thanks MrH, I will
Although Tatsfield couldn't connect to the engine ECU (got all the others though) last Sunday
I want to get this fan swapped over first since that's definitely one of the faults.
And guess what: throttle position sensor has been quiet for a week now

[rwb]

Time for a terminal block?

[rwb]

I had the brainwave of looking at it from the side, which clarified matters somewhat.



However, it's obviously not coming out.

It turns out the fan is screwed onto a bracket which, in turn, screws into the big black plastic thing in front of the radiator. Like this.



So that's simplified matters somewhat...

...however, on my fan the three screws are harder to get to because they're partly obscured by the cylindrical part at the centre of the fan blades. They're also in rather tighter than on the replacement. Therefore they're soaking in WD40 now while I wait for another flash of inspiration... (Might be a while.)

[rwb]

One step forward and two steps back.

The required brainwave was that the small bolt that holds the fan into the motor is left-hand threaded.

With the fan blade off the fan is easy to un-screw, which revealed:

(1) not only is it completely different to the replacement one I got, but
(2) it's not possible to simply un-plug it which means that changing the fan means bumper off to get fan bracket out in order to change the whole loom.

So I put it all back together

[madmadmax]

the one you have unplugs i have that one that plate is held on by the screw then the plug levers out, have you checked the gray relay around the battery box area. check the feed to the ecu

the type of fan is a multiplexed one which has a control feed from the ecu to the fan and a permanent live so disconnect the battery the last thing you wont to do is short the ecu

i have a loom going spear if you need it look like its never been fitted too, i will have a look to see if i have a fan

i could do a little how to for it if you need it

[steve_earwig]

I was wondering that but I've not had anything to do with the multiplex fan on my D9 (multiplex? It's just a fan ffs). I guess that means the two aren't interchangable

[rwb]

multiplex? It's just a fan ffs

zacly

...that plate is held on by the screw then the plug levers out...
...has a control feed from the ecu to the fan and a permanent live so disconnect the battery the last thing you wont to do is short the ecu...

Just as well I gave up as a bad job and put it back where I found it then.

i will have a look to see if i have a fan

Ta. Really appreciate it. It's just the fan I need. Well, I say need -- it's been bust for at least 4 months and the temperature has only been over 90 once, and that was under exceptional circumstances

[rwb]

cf 02 rad fan not working but I know that my problem is that the motor is seized.

Penny just dropped: radiator fan is supposed to run for air con.
Air con is crap unless the car is moving.
I didn't need a regass (well, I did 'cos it hadn't been done in 7 years) I need a new fan!

[madmadmax]

rbw i have had a look for a fan but i don't have one sorry

there may be one on ebay, you need to ask how many pins or wires are on it. there should be 5 pins or 4 wires

thay are £270.07 from the dealers

[rwb]

Ta for looking.
I think I've found a scrapper not far away...

£270.07 from the dealers

I'm not sure the car it worth that

Will remember to roll up a trouser leg to perform the battery ceremony and all that

[madmadmax]

don't forget to do it pointing s,s,w

[rwb]

The saga continues.

Replacement fan number 1 was reduced to scrap by trying to get the fan blade off. The screw moved a little (it's left hand thread) but then it stuck fast and wouldn't move either way. Very strange. Ended up welding a nut onto it but that just sheared the head off when we turned it. For curiosity we drilled the remains out, but the thing was clearly junk by this point.

So: try again.

This is replacement fan number 2. This time complete with loom.

Here's what's going on. There are four wires to the fan motor: two thick ones, a thinner one, and a thinnest one. They emerge from the plastic tubing behind the passenger side headlight.

One of the thick wires goes directly to earth. The other three continue up to the grey thing.
There are five wires to the grey thing: three from the fan, one to earth, and the white one goes to the black connector.

The one wire connector is clipped to the front of the battery box. I observe that this is the only external connection to the system, which I found very surprising -- a single wire supplies both power and 'control', but yet it's split up somehow before being sent down to the fan.

So what is this grey thing all about? Is it magic French electrical pixies? It appears to be absent from the servicebox documentation where the fan loom has only two connections at its end.

I notice the pins are numbered 1, 2, 3, 5 (i.e., 4 is missing), and there are only 4 pins (also numbered 1, 2, 3, 5) where the loom attaches to the grey thing.

How the hell does this thing control a three speed fan?!

Anyway, I think this time I'll change the whole loom rather than risk messing up another fan by trying to get the fan blade off.

[Doggy]

Looks like a std single pole relay to me, the diagram on Petrila suggests you should have two of these for different speeds.....
http://www.petrila.net/pug/Service/index.htm