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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHC4S / Turbo / 40AE Fan resistor change
Leading reported evidence
Use porsche system testers as well
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
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1
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Leading evidence: 'Use porsche system testers as well' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace resistors' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion · Original poster
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.
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Suggestion
Can't you test the low speed operation by switching the air con on?
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion · Original poster
I can always make up a jumper wire to test the speeds with each relay removed.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 1 discussions
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Generation: 20261027T005001Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
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
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 ...
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.
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 .
