Twin cooling fan wiring help needed

[starmist]

One of the cooling fans has stopped working. I swapped the connector over and proved it's the wiring from the car rather than the fan. Each connector has a pink and a black wire coming from it, disappearing into the loom.

I only have the first edition bible which only has a wiring diagram for a 4.3 with a single fan.

Can anyone tell me where the wires go, and where they join up, as obviously the fault it after the separation, and they appear to be on a single fuse?

[spend]

They go via the wing to the fuse box. May go to same relay or separate ones. If you feel brave pop the fuse box out of its holder (there's plenty of harness).

Dave

[starmist]

Presumably that entails removing the passenger footwell panel, and unbolting the fuse holder from above the battery?

[spend]

Fusebox is fixed into housing with allen bolt & cable ties. You should then be able to ease it out (with loom) and see where the fan cables go to. If it is a single fuse / relay set up both fan cables (PINK) should go to the same terminal on the colour coded connector blocks at the back of the fuse box.

Are you sure its not just a rusted rotten spade terminal on the connector? The blade terminals can be eased out by releasing a latch on the back of the terminal. With the known weakness of these connectors to weathering its probably just as easy to crimp on new ones (VWP stock replacements).

Dave

[starmist]

I had a look at the terminals on the connectors above the fasn behind the raditors and they look okay. I even sprayed them with WD. I didn't remove them from the white housing though. I'll have a look at this next tonight.

[spend]

In case you havent done this already, check continiuity between 2 pink and 2 black wires, just to be sure which circuit is at fault (earth or positive could be the failure).

Dave

[starmist]

Now you're starting to talk dirty - multimeters etc. I thought about this, but unless the engine is hot and the fans are therefore switched on, how can I force a feed up the live wire? I understand the blacks are earths, and so I should be able to check continuity from the end of the wire at the connector to the chassis, say.

If I swap the connectors over so the faulty fan swaps over too, so there's nothing wrong with the fan, wiring or fan half of the connector blocks.

[Digga]

Sounds a bit cheeky to ask but have you checked the fuses? It's not been mentioned, but IMHO it could be the most likely cause.

My car has twin fans and there are two fuses - one for each fan.

Helpfully, TVR only refer to these in the fuse diagram as "Fan" and "Fan2", and they aren't adjacent in the fuse box, so if you quickly look down the list and see "fan" you think the job's done, when in fact there's another lurking (hastily added to the list?) near the end. (About # 20 something IIRC.)

Why don't TVR refer to "Fan1" and "Fan2", and locate them together....oh I'd better not get started.

>> Edited by Digga on Monday 14th June 12:01

[starmist]

You might be on to something there. I'll have another look in my handbook, and get myself upside down in the footwell and check it out!

[Graham B]

I believe on mine, that one of fans uses the horn circuit/fuse. May be worth checking that the horn works, if not check the horn fuse and replace.

Cheers,
Graham

[alanv8]

I had the same problem with my car last year.
one of the fans stopped working due to a wiring fault.

i did find that both the connectors to the fans were badly corroded even the one that was working so it is worth cleaning them up.
I checked fuses for fans and for horn circuit as on some years one fan is wired to the horn circuit although this might not be the case, also check relays just because they are clicking dosen't prove they are working correctly.
After much tracing i couldn't find where the feed was broken, i ended up wiring a new feed from the alternator fuse with its own relay working off the switch wire from the other fan.
Somethng to sort out sharpish i would have thought as you don't want to over heat it and warp those heads.
good luck!!