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YOUR RESEARCHCooling fan resistors and torx request, C4S
Leading reported evidence
Test with a battery, works great
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Performed · outcome unconfirmed
all back together and bench tested with a battery, works great on all 3 speeds :thumbs: happy days
Replace rads/air con condensers, while it's off i've
No successful repair reported for this finding.
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Suggestion · Original poster
My front end is in bits to replace the rads/air con condensers, while it's off I've tested the fans via jumping the relays and the drivers side resistor is bad.
Leading evidence: 'Test with a battery, works great' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace rads/air con condensers, while it's off i've' (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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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.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed
New fan for the C4S/Turbo seem to be twice the price of other fans but at least I know I can use the same ballast that has been successfully used by others here and that I don't have to fork out £140.
Replace rads/air con condensers, while it's off i've
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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
My front end is in bits to replace the rads/air con condensers, while it's off I've tested the fans via jumping the relays and the drivers side resistor is bad.
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.
Discussions that contain suggestions
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
The C4S/Turbo uses a different resistor to the standard 996 or 986, it is mounted on the back of the fan and has 4 wires in total going to three terminals on the OEM resistor.
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.
Discussions that contain suggestions
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suggestion
New fan for the C4S/Turbo seem to be twice the price of other fans but at least I know I can use the same ballast that has been successfully used by others here and that I don't have to fork out £140.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Replace rads/air con condensers, while it's off i've
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
My front end is in bits to replace the rads/air con condensers, while it's off I've tested the fans via jumping the relays and the drivers side resistor is bad.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed
New fan for the C4S/Turbo seem to be twice the price of other fans but at least I know I can use the same ballast that has been successfully used by others here and that I don't have to fork out £140.
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
The C4S/Turbo uses a different resistor to the standard 996 or 986, it is mounted on the back of the fan and has 4 wires in total going to three terminals on the OEM resistor.
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
New fan for the C4S/Turbo seem to be twice the price of other fans but at least I know I can use the same ballast that has been successfully used by others here and that I don't have to fork out £140.
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.
10 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T135432Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Spent a couple of hours trawling through forums to find the answer to this, so apologies if this is a repeat but I can't find the answer.
My front end is in bits to replace the rads/air con condensers, while it's off I've tested the fans via jumping the relays and the drivers side resistor is bad.
The C4S/Turbo uses a different resistor to the standard 996 or 986, it is mounted on the back of the fan and has 4 wires in total going to three terminals on the OEM resistor. If I buy an off the shelf 100w 0.5ohm resistor from a component shop how do I wire it in? I understand that one of the wires may be unused as the turbo has a "medium" fan speed option which I don't need.
2 x Yellow/Black wire on one resistor terminal
1 x Yellow/Grey on one terminal
1 x Yellow/Blue on one terminal
My guess is the 2 Yellow/Blacks on one end of the resistor and one of the other two on the other end?
Also, related, all the fasteners were rusted in, anybody know where I can get the Torx head self tappers that the air con condensers are held on with? Annoyingly they're not on the parts diagram and OPC's are closed. Design911 drew a blank unless I can send them a picture.
Thanks
On this photo, resistor goes between green and white wires. Basically you have a +12v green wire from high speed relay to motor, +12v white wire from low speed relay to motor and a black -12v wire to the motor. Low speed white +12v is dropped to +6v by the resistor to run at half voltage.
Hope this helps :thumb:
Demort beat me to it, but I found the Turbo schematics online. There are indeed 3 speeds on the Turbo, but you don`t need the middle speed, so you need 2x yellow/black to one end of your new resistor and yellow/blue to the other end, ignore the yellow/green( grey?) as this is for middle speed :thumb:
Having a similar issue myself
Fan dead when i put 12V directly on to it. Ballast disintegrated when I tried to remove the 12v Feed spade :nooo:
New fan for the C4S/Turbo seem to be twice the price of other fans but at least I know I can use the same ballast that has been successfully used by others here and that I don't have to fork out £140.
Thanks
I just had this on my turbo, So, i carefully removed the back off the fan and discovered that it was full of dust and the brushes were worn fully down and lost contact.
so I had an old motor in my workshop, stripped out the rather large chunky carbon brushes cut 4 x pieces down with the angle grinder and slotted these in front of the worn out ones, so giving them an extra 10mm of 'new' carbon brush material.
all back together and bench tested with a battery, works great on all 3 speeds :thumbs: happy days
