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Old 05-22-2019, 11:10 AM   #1
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Manual Cooling Fan Switches

Installed a set of manual switches to activate the radiator and engine cooling fans. The installation went fairly well but followed the original directions provide online here and although the wiring diagram was correct the photos of the relays were not. I was one relay off which caused the internal AC cooling fan to come on upon immediate insertion of the key and to stay on upon it's removal. A quick check to the Bentley Manual straightened out my problem.

I will eventually follow the Radium King's suggestion to use a 996 Batwing and switches to make this look more OEM but for now I think these will do. Thanks to all that did the original writeups and diagrams!



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Old 05-22-2019, 11:23 AM   #2
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Originally Posted by Jgkram View Post
Installed a set of manual switches to activate the radiator and engine cooling fans. The installation went fairly well but followed the original directions provide online here and although the wiring diagram was correct the photos of the relays were not. I was one relay off which caused the internal AC cooling fan to come on upon immediate insertion of the key and to stay on upon it's removal. A quick check to the Bentley Manual straightened out my problem.

I will eventually follow the Radium King's suggestion to use a 996 Batwing and switches to make this look more OEM but for now I think these will do. Thanks to all that did the original writeups and diagrams!
That looks great!

Would you mind posting the links to the project? I'm not handy with wiring diagrams, so if you could describe tips and tricks that you employed... I'd be grateful.

Also... links to where you sourced your switches and the relays.

In advance, thanks!
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Old 05-22-2019, 11:46 AM   #3
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simple, find the correct yellow wire for high speed fans

Use a three prong switch.

1. prong to ground.
2. incoming yellow wire
3. outgoing yellow wire

In switch position 1, the fan operates via computer's instruction based on coolant temp.
In switch position 2, fan is off entirely
In switch position 3, fan is on full time.

pretty straightforward operation.
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Old 05-22-2019, 01:18 PM   #4
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If I'm not mistaken those relays are already in the car, you only need to make a wire harness to go from the switches you add to manually operate the fan relays .
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Old 05-22-2019, 01:25 PM   #5
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unless you want to use oem switches. the porsche switches are non-latching so you have to add a latching relay. sad but true.
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Old 05-22-2019, 01:28 PM   #6
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You are correct. The relays are already present in panel #1. It's simply a matter of attaching the fuse taps to pin 85 on each relay, making the wiring loop and attaching to a switch. Actually pretty easy. Quadcammers suggestion would work but I didn't want to test the wiring as I too am no electrical wizard.

I will post my parts list and suppliers when I get home tonight. The only fiddly work I had to do was to file the opening in the taps a little wider to fit the pins on the relays. If I did it again, I'm not sure I would go to the trouble of wiring up the fans low speed as you will most likely only use the high speed to cool things down quickly. I did it just because it was there.
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Old 05-22-2019, 01:49 PM   #7
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why did you need these switches?
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Old 05-22-2019, 04:21 PM   #8
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I installed the switches because I AX the car and it is my daily driver. Both AX and traffic in 90+ degree heat get the temp hotter than I like to see it. Here are the parts I used:

Amazon - 1 Uxcell AC250V/6A 125V/10A 3P SPDT 3 Position Round Button Boat Rocker Switch, 1 Uxcell AC250V/6A 125V/10A 2 Terminal Toggle SPST On/Off 2 Position Round Button Small Boat Rocker Switch.

Fuse Taps from columbineconnectors.com.

To drill the holes I used a progressive drill bit which went up to a 3/4" dia hole. There was a small locator tab on the switch that I clipped off with a pair of snips.

I purchased the wire from Lowes (Southwire 25 ft. two pkgs). I used AMP wire splice connectors and end connectors. Again, purchased from Lowes.

The hardest part of this whole thing was determining where on the batwing to position the switch. As you all know there is not a straight, flat surface on this whole car which is why the switches are positioned higher on the batwing than not. I was concerned that I had to trim off the locking recess on the top of the batwing but it holds fine with no issues. Sorry the relay photo flipped upside down. Still can't figure that one out. Good luck...
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Old 05-23-2019, 12:03 AM   #9
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thanks for the reply. I'm not sure what AX'ing the car means though to be quite honest. I'm new to Porsches and not being american also doesn't help with some terminology you guys use sometimes

thanks
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Old 05-23-2019, 03:01 AM   #10
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Sorry. AX stands for autocross. It’s where you run a series of time trials around a small course usually set up with cones. In between runs and sitting out in the heat really warm things up. Is this totally necessary, probably not. But others, smarter than me have done it and it’s really simple to do. You can also hide the switches if you don’t want them showing.
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Old 05-23-2019, 04:49 AM   #11
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Is the system now fully manual or automatic with the ability to turn on as needed
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Old 05-23-2019, 05:28 AM   #12
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The system operates automatically as designed if the switches are in the off position. By turning the switches on, it allows you to turn on the fans at any time you desire. I did not provide pictures of the engine cooling fan which is the two position switch on the right. But it will allow you to turn on the engine bay cooling fan whenever you desire. It too allows the car to operate automatically when the switch is in the off position. Hope this clarifies.
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Old 05-23-2019, 06:07 AM   #13
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I've got the two high speed radiator fans wired to a switch and I run it whenever I am on track, it really does help to keep things cool. A side effect is that I have now picked up pending code, something to do with the fans, the car knows that something is up, but it doesn't set a CEL so I don't worry about it. Here's a couple of approaches to possibly resolve this, but since it doesn't set the CEL I don't worry about it.

Manual Override Switches: Engine Cooling Fan and Fuel Filter Heater | Tucks' Travels in a Truck

https://naxja.org/forum/showthread.php?t=1025399
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Old 05-23-2019, 06:26 PM   #14
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Awesome...love these mods and hacks that do something. Thanks for taking the time to share.
I remember adding heated mirrors to a pickup truck for the winter. Couple hours of effort for YEARS of convenience. I shared my circuits and methods on the forums because thatís what we do.
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Old 05-24-2019, 11:34 AM   #15
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Thank you TTT but honestly all of the credit goes to the guys before me. I just took what they figured out and tried to follow along as best I could. I won't attempt to name all the smart people on this forum 'cause I'll miss somebody but I think I could practically build the car from scratch (at least I feel that way) with all of the help they provide. Search for manual fan switch and you'll see a lot more info from the guys that really deserve the credit. It's a fun easy mod that really provides some benefit.
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