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911uk

Cooling fan problem

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Original source
8 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHCooling fan problem

Leading reported evidence

Replace 4s fan, the resistor looks completely different

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

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

Having just swapped a 4S fan, the resistor looks completely different to the NB cars so don't rely on info for those cars.

Original post Read captured discussion
Cooling fan problem
Frequently discussed work

Check heat in rads etc and took it up

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

I ran the car to check heat in rads etc and took it up to 93deg coolant temp.

Original post Read captured discussion
Cooling fan problem
Read full discussion summary

Leading evidence: 'Replace 4s fan, the resistor looks completely different' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check heat in rads etc and took it up' (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.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

Read captured replies

1 matching discussions · 8 captured posts examined · 0 partial discussions

Compare 4 other evidence results

Replace cooling radiators and aircon rads

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

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 · Original poster

I've just replaced both cooling radiators and aircon rads on the c4s.

Original post Read captured discussion
Cooling fan problem

Run car

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

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 · Original poster

I ran the car to check heat in rads etc and took it up to 93deg coolant temp.

Original post Read captured discussion
Cooling fan problem

Check heat in rads etc and took it up

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

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
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

I ran the car to check heat in rads etc and took it up to 93deg coolant temp.

Original post Read captured discussion
Cooling fan problem

Check they work

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

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
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

any way of manually starting the fans, to check they work?

Original post Read captured discussion
Cooling fan problem
Frequently discussed actions (5)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Check heat in rads etc and took it up

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

I ran the car to check heat in rads etc and took it up to 93deg coolant temp.

Original post Read captured discussion
Cooling fan problem

Check they work

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

any way of manually starting the fans, to check they work?

Original post Read captured discussion
Cooling fan problem

Replace 4s fan, the resistor looks completely different

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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

Having just swapped a 4S fan, the resistor looks completely different to the NB cars so don't rely on info for those cars.

Original post Read captured discussion
Cooling fan problem

Replace cooling radiators and aircon rads

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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 · Original poster

I've just replaced both cooling radiators and aircon rads on the c4s.

Original post Read captured discussion
Cooling fan problem

Run car

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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 · Original poster

I ran the car to check heat in rads etc and took it up to 93deg coolant temp.

Original post Read captured discussion
Cooling fan problem
Coverage and how to read this overview

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.

8 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: 20261026T120458Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I've just replaced both cooling radiators and aircon rads on the c4s. Got it bled up this afternoon, wasn't too arduous. I ran the car to check heat in rads etc and took it up to 93deg coolant temp. None of the cooling fans kicked In! Does anyone know what temp they kick in at? I switched aircon on, needs regassed obviously, to manually start the fans, only the passenger side came on. Is there a common issue with fan resistors? I would like to check the resistance of them and manually start both fans, any ideas guys? I'll post some pics of the job when I get the liners and PU back on again.

POST 2Original post

Your resistor is buggered. £5 from RS. Full speed only comes on at about 103 degrees, low speed with aircon. Search the forum, it has been well covered. MC

POST 3Original post

Could well be... just bear in mind when ordering that the resistor for the 4S/TT is different from the C2/4 ones. I'm about to fit a new fan... what I thought was a broken resistor was actually the fan.

POST 4 / ORIGINAL POSTEROriginal post

thanks guys, any way of manually starting the fans, to check they work? I know the passenger (LHS) works.

POST 5Original post

Dob a 12v + feed onto the green wire in the photo and ground the black wire to get the fan to run at full speed :thumb: These fans do have a tendancy to get jammed with debris/stones, so make sure the fan is free to turn by poking it with a screwdriver or suchlike.

POST 6 / ORIGINAL POSTEROriginal post

Thanks kurlykris, I will try that today :thumbs: Does anyone have the resistance details for a diy resistor?

POST 7Original post

It's all here... http://www.911uk.com/viewtopic.php?t=116494&highlight=resistor+fan

POST 8Original post

Having just swapped a 4S fan, the resistor looks completely different to the NB cars so don't rely on info for those cars.

This is a source reference. Confirm exact model applicability in the original material.