Please help, folks

Car - 2005 1Z5 combi 1.9tdi PD 8 valve. I have had this car since 2008 and now it has covered just shy of 300,000 miles. The car is in really good condition, well serviced but now it doesn't have much value.

Recently, I noticed that instead of taking its time to get up to temperature, t has been quickly getting up to normal but not overheating, so everything fine....

Then I noticed that the air con wasn't working......... So, I thought about this and then had a look at both of the fans behind the radiator.

Lo and behold neither fan was working, dead as dead can be. I did my research and the most likely suspect seems to be the Fan controller unit situated behind the main engine cooling fan.

Of course it could be that there in no electricity getting to the main plug(bottom left corner of the radiator).

My ability with car electrics is very limited and for some reason I find the wiring on the skoda to be needlessly complicated.

I have removed the cooling fan unit complete (quite easy), removed the controller unit and applied 12volts to both fans and they both work so, logically this leaves me with a faulty controller unit and/or a failed power supply. I have looked at the fuses in the engine bay (f/n/s against the battery) and they all seem to be fine.

My thinking is that the controller unit has failed as I have already had to replace it once before but of course I am not sure as I find it difficult to test the electrical supply as I don't know which wires are supposed to be live and which are not.

I have attached the photo i have taken of the connector and wiring.

So advice would be greatly appreciated. I am tempted to go ahead and get another controller unit but I am not sure that the controller is the problem. The las replacement was a long time agao now but not that long. It is an NRF controller

Thanks to all if you got this far. I will watch out for replies

Thx again

Tom

Thick brown is earth.

Thick red is permanent 12V.

Blue/red will be a switched 12V, only there when engine on.

Other wire will be control signal from engine ECU.

Pete,

You again......loool!! You always respond to my posts, I am v grateful (You may not remember but you gave great help with another wiring problem some time back (now successfully repaired thanks to your advice.)

I hardly ever post as my car is so reliable. I really do appreciate your response.

So, the thick red is permanent live as in ignition off, key out?

In that case is it ok for me to test the supply with a simple screwdriver type circuit tester?

Red across to brown and blue/red to brown with ignition on or engine running?

Regards

Tom

Edited 53 minutes ago53 min by ThomasP

29 minutes ago, ThomasP said:

So, the thick red is permanent live as in ignition off, key out?

Yep

Test with whatever you have available

🙂

Pete

thx again

My kit is so basic that I've just ordered a screwdriver type tester....lol.

I'll deffo get back to you

Thx

Tom