MK4 2003 V5 radiator fan staying on. FCM faulty?

[sjcrolm]

Hi All
I have noticed on this site quite a few threads on this subject, but seems to be no real answers.
I went out to my car this morning and battery flat. When i connected jump leads (before i even put keys in) i noticed the smaller of the 2 fans was on.
jumped the car and off i went. noticed that when i stopped the fan was still running.
Having read the many threads on here i decided to investigate, and took battery out, and found the FCM.
I disconnected all the connections to the FCM and to the fans, gave a them a good spray of WD40.

Reconnected, and still the little fan running.

My questions are. Is the FCM at fault? I have found one and was going to collect tomorrow, or could there be another fault.
The only way i can stop it is to pull fuse on top of battery out.
i have read on here issues with fuse 16????

Any help before i change the FCM would be helpful.

[Crasher]

It could be the fan control unit but the fans on the V5 are the same as the V6 and the PD 150 and these are known for problems.

[sjcrolm]

Appreciate your reply, but most of the threads on here relate to the fans either not working or pulsing, mine just wont turn off!!!!!
i believe i can test them by using wire and crossing the terminals and see if they work.

[Crasher]

Yes I have had that as well. I can't look at the wiring diagram at the moment as my system is updating. We have an unusual version of your car in today, the Seat Toledo V5.

[sjcrolm]

Just been out and check hosing the wire connecting between the 3 terminals. That didn't help, as as soon as I replace the file on top of battery the fan starts!!
I wonder Crasher, if you could explain the point of the 2 Fans? Do they do independent jobs, or both the same. I only ask as if I leave the fuse in, and disconnect the fan that's constantly on, will the other work if temp goes up?????

[Crasher]

Is it a 20V and does it have electronic Climate control? I would imagine it does.

[sjcrolm]

Hi, yes it is the 20v job, and has climate control. Does that make a difference?

[MiniMental]

Could you not use VCDS to check for faults on HVAC module? I know the electric fan is linked to CC unit on other vag cars???

[sjcrolm]

Minimetal. I have absolutely no idea what you just said. :-S

[Crasher]

The fan wiring for Climate control (AKA HVAC for Heating, Ventilation, Air Conditioning) is different to cars with normal AC so I now need to look at the wiring diagram but my desktop PC has thrown a rod....

[sjcrolm]

Appreciate all your help. I have just fitted a new module, and fingers crossed, touch wood etc it has fixed problem. Now I wait for the next issue to arise.