C4S / Turbo / 40AE Fan resistor change

steve r · 1 May 2019

Hi,

It looks like the radiator fans aren't working on the low speed on my 40AE, the high speed is fine so I think I need too change the resistors. These are different on the C4S / Turbo / 40AE to the standard Carrera ones that can have alternatives spliced in.

Is there a similar alternative for these resistors or is it genuine parts only?

Thanks

deMort · 2 May 2019

I have to admit .. i've never changed one of these so i can only assume they are pretty reliable ..

i would think its porsche parts only ..

I had a route around and found a wiring diagram if its of any help , its from a Turbo but as close as i can find to this system .. i'm pretty sure they are the same ...

steve r · 2 May 2019

Thanks for the reply and for the wiring diagram. It confirms what i'd read today that the Turbo fans have 3 speeds rather than the 2 of the Carrera.

I'm now not 100% that I have a fault as I only assumed I did due to playing with my Durametric and nothing happening when I clicked on the low speed activation option, the fans activated when I clicked on the high speed option though. It's possible that the durametric can't activate the 3 speeds of the turbo fans, i'll try to have another go this weekend. I can always make up a jumper wire to test the speeds with each relay removed.

I think you're right about these being more robust as theres very little info online about them going wrong when compared to the Carrera resistors.

deMort · 3 May 2019

To be honest .. i don't think you have a fault .. even with the tester i use .. not cheap ones then activations of items are a bit hit and miss .. and i use the Porsche system testers as well .

if the higher speed works then you don't really have a problem as such .. the car can cool if needed and as i said i've not had a problem with these as of yet so its leaning towards a tester fault and not the car i would guess at .

Robertb · 3 May 2019

Can't you test the low speed operation by switching the air con on?

C4S / Turbo / 40AE Fan resistor change

steve r

Spa-Francorchamps

deMort

Monaco

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steve r

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