12 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHHow to test radiator fans
Leading reported evidence
Run (in neutral ) until it's up
Suggestion or failed attempt
No successful repair reported for this finding.
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Suggestion · Original poster
Do I need to just let the car run (in neutral ) until it's up to temp and listen?
Leading evidence: 'Run (in neutral ) until it's up' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Run (in neutral ) until it's 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.
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Suggestion
If they run on low speed it's pretty much a guarantee they will run on high speed.
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Suggestion
Pretty sure you can test the high speed by turning the AC on and listening/placing your hand in the front of the front wheels wells.
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12 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T112012Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Is there a simple way to check if the radiator fans are working? The car runs between the 180 & 220 mark (outside air temp is 94) but I can't seem to hear if they are coming on at all? Is there a simple way of testing them? Do I need to just let the car run (in neutral ) until it's up to temp and listen? Thoughts
Pretty sure you can test the high speed by turning the AC on and listening/placing your hand in the front of the front wheels wells. Not sure on low speed. Although I've read where folks say that can be activated with Porsche electronic device(PIWIS) or the Durametric device.
Actually the fans run on low speed as soon as the A/C is switched on. If they run on low speed it's pretty much a guarantee they will run on high speed. Just remember there is a separate relay for each speed of each fan, and separate fuses too. Four relays and four fuses total.
The durametric and the piwis can turn the fans on and off. Not sure about other scan tools.
What year is your car? My 99�s fans won�t come on, even low speed, until the last white line. The DME is reporting close to 212F, even if the dash gauge is showing a much higher number.
