Radiator fan

[Starter986]

Originally Posted by steved0x

>Next day checked the fan operation (car cold, engine running, AC on) and only the passenger side fan came on.

Most common cause of this is failed low speed resistor.

There are 4 relays for the fans, a high speed relay and a low speed relay for each side. Your post doesn't say if you tried both relays on the failed side. If you jumped the high speed relay and got no fan, that sounds like the fan. But if you jumped only the low speed relay, then it could be a failed resistor which is very common and the way to test would be to jump the high speed relay.

I actually have a switch on my Boxster that grounds pin 85 on the two high speed relays so I can run the fans on high when I am on track.

Here are a couple of threads with more details:
https://986forum.com/forums/diy-project-guides/61513-diy-manual-radiator-fans-control.html
https://986forum.com/forums/diy-project-guides/76140-diy-manual-radiator-fan-switch-w-oem-switch.html

Hi Steve,

Thank you for the input. Oh... I read a lot of threads. A lot. I know that I'm not the first person with a failed fan... so I rely on the seqarch feature first before turning to the forum.

I jumped all relays... just to be certain.

The driver side high speed fan, when jumped... silence.

Once I get this repaired I'm going to go the switched fan route.

That said...

Watcha think? Do I purchased used, and hopefully from a lower mileage specimen, or do I purchase that aftermarket new one for ~$65?

Thank you.