Fan Control Unit - Faulty

[Tomdeswrig]

Hi

Just had my car serviced and happen to mention to them that when using the air con that the radiator fans seem to cut in and out a lot - even when only just turning on the AC. Turns out that I have a faulty fan control unit. They have suggested that I need a new fan control unit and also the fans on the radiator to be replaced.

I have a 2005 Octy 2 litre TDi 140BHP (Engine Code BKD)

1) Do I really need to replace the module and the fans?

2) When is the fan control module/unit on my car - my workshop manual shows a picture of the module but not where it is!!

Any help and or photos really appreciated.

Thanks

[Hauptmann]

I *think* is is located below the battery on some models. But also I have seen other VAG cars (VW) where it was integrated in the motor assembly.

[Tomdeswrig]

Hi

I wondered that and have looked with a mirror under the battery - couldn't see it (too dark!!). If it is integrated with the fans then it may be a complete fan/module assembly rather than separates?!?!?

[Tomdeswrig]

Does anyone else have any ideas where to find the fan control unit on my Octy???

[Hauptmann]

Well, I just had a look at the circuit diagram for your car and the FCU (J293) connects to the main loom via connector T4 and connects to the radiator fan via connector T2. It earths via an earth point on the left front chassis member. The locations of these connectors are:

T2f - 2-pin connector, in the holder on the radiator

T4p - 4-pin connector, in the holder on the left radiator

I think all of this means that the FCU must be mounted on, or close to, the radiator and not too far from the fan.

HTH

[Tech1e]

The radiator fan control unit is built into the main fan, the two fans are connected via a linbus network with the large fan being the master and the smaller fan being a slave.

Edited 24 January, 2011 by Tech1e

[Tomdeswrig]

Thanks for the info - I am quessing that the solution may be a new pair of fans with the built in components!! - seeing as they share the housing. Price I have so far is circa £200. Will I have to reset any fault codes or will the ECu recognies that the fault has gone with the new parts?

Thanks

[BushcraftChris]

@Tomdeswrig, what was the cure in the end?

Chris