Disco TD5 electric fan always running

mac1 · Jul 9, 2009

Hi,

just got a TD5 Discovery 2 and i have just noticed the electric fan is always running from the moment i start the engine?
I would have thought this would only usally operate a higher temperatures and not when the engine is cold.
What is controlling this fan? temp sensor somewhere?

Any help greatfull.

sastek · Jul 9, 2009

Hi welcome to Landyzone!

Are you sure you have an electric fan? the TD5 has a viscous fan as standard.

mac1 · Jul 9, 2009

The electric fan is in front of the radiator and viscous one on the rear inside engine bay.

The Mad Hat Man · Jul 9, 2009

try turning yo air-con off.

mac1 · Jul 9, 2009

Aircon is off.

Buzzer · Jul 10, 2009

this may indicate the motor has overheated at somepoint the aircon fan has tripped
in to help the viscous fan and will need to be reset by getting it plugged in

Hope this helps

mac1 · Jul 10, 2009

Thanks, will get it in for a system check.

sastek · Jul 12, 2009

mac1 said:
The electric fan is in front of the radiator and viscous one on the rear inside engine bay.

So there is! I never noticed the electric fan before :doh:

Tilo · Sep 2, 2010

Hi there!

Same problem here.
The aux fan is always on.
Heard something about clearing an error code in the ECU. Is that correct? Will it solve the problem? Just plug it in and clear it?

sierrafery · Sep 2, 2010

Tilo said:
Hi there!

Same problem here.
The aux fan is always on.
Heard something about clearing an error code in the ECU. Is that correct? Will it solve the problem? Just plug it in and clear it?

If it's not some other failure then yes....but it could have many more causes...........anyway the ECM scan is a good start.

CanAmSteve · Feb 5, 2011

Just had my head gasket replaced and when I got the Disco 2 back, the AC fan was running constantly. ECU had logged faults for the temp sensor (probably when run up refilling?) and clearing them with the Nanocom instantly stopped the fan.

Dipsterson · Feb 5, 2011

Mac1 - Have a look at this thread that was updated yesterday. I Found it very useful and will certainly be getting it checked as I have the same issue -

http://www.landyzone.co.uk/lz/f8/2002-td5-auto-aircon-fan-110511.html

Dipsterson

Antonpretorius · May 4, 2013

Has anyone been able to cure this problem then? I have the same problem. Aircon fan runs all the time.

Antonpretorius · May 4, 2013

Has anyone found a cure yet? I have the same problem on my Defender 90 Td5.

Dippypud · May 4, 2013

Antonpretorius said:
Has anyone been able to cure this problem then? I have the same problem. Aircon fan runs all the time.

Antonpretorius said:
Has anyone found a cure yet? I have the same problem on my Defender 90 Td5.

Not sure if its faulty ECU or the ECU is getting a signal from a duff sensor ...

Any fault codes ?

Dippypud · May 4, 2013

Antonpretorius said:
Has anyone found a cure yet? I have the same problem on my Defender 90 Td5.

Where in SA are you ?

The ambient temps there can cause probs we don't see in England ...

Your ECU has sensed that at some time your engine was overheating. It then switches the air-con fan on to help out.
Unfortunately it will not switch it off again until the fault is cleared using a pooter.
It is a not-really-helpful feature of the ECU.

There's a guy down under complaining about this:
Thermo fan Constantly on - Australian Land Rover Owners

spanishlair · May 4, 2013

sierrafery said:
If it's not some other failure then yes....but it could have many more causes...........anyway the ECM scan is a good start.

Hi S/F
Thanks for you help the other day when mine had the same problem. Your diagram was a great help to the auto electrician.
Turns out a resister had failed.
Getting it fixed next week.
Paul.

Raider td5 · Oct 8, 2019

Hi,

I have the same issue and I have taken my car to the dealership twice and they had no idea about this issue. I got them to hook it up to the system called T4 which apparently is LRs genuine diagnostic system for the TD5. However, I tried going through the menus but couldn't find any option to turn the fans off.

If anyone here is familiar with this system, can you please guide me going through what menus will lead me to an option to turn this forced assist off.
You help is much needed and would be really appreciated!!

I am from Pakistan and the TD5 Defender was never launched here but the dealer has some experience with TD5 Discos.

sierrafery · Oct 8, 2019

Raider td5 said:
Hi,

I have the same issue and I have taken my car to the dealership twice and they had no idea about this issue. I got them to hook it up to the system called T4 which apparently is LRs genuine diagnostic system for the TD5. However, I tried going through the menus but couldn't find any option to turn the fans off.

If anyone here is familiar with this system, can you please guide me going through what menus will lead me to an option to turn this forced assist off.
You help is much needed and would be really appreciated!!

I am from Pakistan and the TD5 Defender was never launched here but the dealer has some experience with TD5 Discos.

Hi ..so it's about a D2 or about a defender though? cos here is the disco section... anyway if it's Td5 and the electric cooling fan is on all the time there should be an engine overheat fault code logged which must be erased for the fan to stop...if no fault code and the fan is on the relay must be ruled out as to not be stuck closed, if that's ruled out as well i'm affraid that the ECM is fubar

Raider td5 · Oct 9, 2019

Thanks for your reply.

Mine is a Defender so thats what is in question. Also, I would like to know the menus in the T4 diagnostic system which lead to such an option. Would you know these menus?

Disco TD5 electric fan always running

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