8 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCooling Fans
Leading reported evidence
Check fuses and now swapped the relays
Performed · outcome unconfirmed
No successful repair reported for this finding.
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0
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Performed · outcome unconfirmed · Original poster
I have checked the fuses and now swapped the relays from now 1 position to no.2 position with no change to the fault.
Leading evidence: 'Check fuses and now swapped the relays' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check fuses and now swapped the relays' (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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Performed · outcome unconfirmed · Original poster
Where is the ballast resister located and can it be easy swapped from side to side to prove the defect.
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Suggestion · Original poster
The aircon was on and the car does not appear to run much hotter than 80 degrees.
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Suggestion · Original poster
r/h will run on low and then as the car gets hotter both run at high speed.
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Suggestion
The 986/996 fans run at two speeds and as previously mentioned should run the same speed on both sides of the car.
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8 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Porsche Club GB: 1 discussions
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Generation: 20261027T025149Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi,
I am trying to understand how the front cooling fans should work... Please help. I have done a search but still have a question.
I was putting my C4 in the garage yesterday and I noticed the fans were running. I got out of the car to check and found that I could only feel/hear the driver side fan running.
Should the fans run on both sides of the car at the same speed (speed 1 or speed 2) or can they run at different speeds. The aircon was on and the car does not appear to run much hotter than 80 degrees.
thanks
Jetbox
You didn't find this then: http://www.porscheclubgbforum.com/tm.asp?m=330170
They should both run at the same speed. Most likely one of the low-speed ballast resistors is faulty, but it might also be a relay.
The 986/996 fans run at two speeds and as previously mentioned should run the same speed on both sides of the car.
btw the 987/997 fans are variable speed.
the fans should both be running at whichever speed it requires, with aircon on the both run at low speed, but you sometimes find that one of the fans fail on low speed this in turn then causes the system to up the speed to high and both fans end up working but only on high... opc should be able to system test these with piwis by testing the speeds in drive links
Hi,
After some more playing and diagnosis I have confirmed that its the l/h fan that will not run on low speed. r/h will run on low and then as the car gets hotter both run at high speed. I have checked the fuses and now swapped the relays from now 1 position to no.2 position with no change to the fault.
I could give up and take to opc under warranty but would like to fully diagnose the fault as part of getting to know and understand the car better. I guess the next step is the low speed ballast resistor or a wiring fault. Where is the ballast resister located and can it be easy swapped from side to side to prove the defect.
thanks
Jetbox
You would struggle to swap the ballast resistors side to side. Even the workshop manual says to cut off the wires and splice in the new wiring. The resistors have plugs on the fly leads, but you have to dismantle half the front end to get to them. They are a really common problem (I had to fit two to my old C2) so I would suggest just going ahead and changing it.
(Photo courtesy of Loren at RennTech)
Richard,
thanks, just been searching and found the post from Loren on rentech with the location... looking at the cost of the resistor my next step is to call opc to book in car for warranty fix.. I have learnt alot in the process though. May as well use the warranty before it expires...
many thanks
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