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Old 06-21-2019, 10:25 AM   #1
Join Date: May 2019
Location: Chatsworth, Canada
Posts: 34
Cooling Fan update DIY

Thought I'd post one of the easiest fixes I've done.

My front cooling fans did not work on low speed when you clicked on the AC.

I've not used the AC, however my mechanic friend advised that the AC won't work with them malfunctioning because the condensers must have the fans working as well for correct temperature, etc.

Sounded like the resistors to me, so I went at it today and cut them out. Easy to get at, no need to remove wheels. By the looks of them, they've seen better days.

I ordered some new heavy duty ones from Mouser, 100W, .50 ohms.

Soldered in green/white to white on one end, green only to the other.

Zip-tied them to the back of the fan to keep cool airflow on them (resistors get quite warm) and...presto!

Fans work, AC works.

Total cost...$38 CAN$.

Gotta love it when a plan comes together.

That is all.

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Old 06-21-2019, 11:14 AM   #2
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Join Date: Jun 2016
Location: Quebec, Qc, canada
Posts: 87
I did the same with a 1 ohm / 100 watt resistor 2 years ago and work perfectly. I test the fan both speed using durametric every spring when I get the car out of the barn.

The size of these resistors can fit in the existing clip.

10$ each at Digikey

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Old 06-21-2019, 11:40 AM   #3
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Join Date: Apr 2019
Location: Eastern VA
Posts: 24
Noob here - how did you get to them without removing the wheel? Just peel the wheel well liner back?
04 Boxster S 550/Anniversary/Special Edition, Tiptronic
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Old 06-21-2019, 11:53 AM   #4
Join Date: May 2019
Location: Chatsworth, Canada
Posts: 34
Right below the fan there was no cover, you could see the resistor in it's clip on the rail. The covers are likely missing, and are probably for access anyway.

Otherwise, you could just turn the wheel one way, and pop open the wheel liner right there too....vice versa for the other side.

The new resistors are up out of the way of possible road debris, and are attached to the back of the fan assembly to optimize airflow on them for cooling.

Saw several writeups on the 996 forum too, and went for it.

Super easy.

ps...use a soldering gun, then good heat-shrink to seal the wires up.

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