HOW TO DO AN ADVANCED SEARCH.

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For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

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3 relay cooling fan wiring - - - > question53.79

3 relay cooling fan wiring - - - > question

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3 relay cooling fan wiring - - - > question

Post  spence on Sat Apr 02, 2011 10:29 am

I've got the relays wires labeled and sorted, I just have one question. Can someone confirm fan #2 positive and negative wires according to 944-LT1's wiring diagram?



Here's a picture... it looks crazy, but it's really not bad.



Thanks!

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Re: 3 relay cooling fan wiring - - - > question

Post  Arthropraxis on Sat Apr 02, 2011 10:42 am

What gauge wire are you using for the fan relays? The pigtails that came on my relays seems very thin. I have this diagram if it helps you. http://www.ls1tech.com/forums/attachments/conversions-hybrids/240453d1278029972-question-ls1-pcm-cooling-fan-control-cooling-fans.gif

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Re: 3 relay cooling fan wiring - - - > question

Post  spence on Sat Apr 02, 2011 10:51 am

LOL... I can't understand that... The wiring on the relays I have is 14awg.

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Re: 3 relay cooling fan wiring - - - > question

Post  944-LT1 on Sat Apr 02, 2011 2:17 pm

The computer controls the ground path for the three cooling fan relays. The relays are used to control the high current flow to power the cooling fan motors. Both fans operate together. When minimum cooling is required, the PCM energizes cooling fan relay #1 and both fans operate at low speed, since the fans are connected in series through cooling fan relay #3. Cooling fan relay #2 is open (not energized) and is not used for low speed operation of the fans. When maximum cooling is required, the PCM energizes all three cooling fan relays. The left fan is still powered through cooling fan relay #1, but is now grounded through cooling fan relay #3. The right fan is now powered directly through cooling fan relay #2 and both fans operated at high speed.


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Re: 3 relay cooling fan wiring - - - > question

Post  spence on Sat Apr 02, 2011 4:55 pm

Thanks,

What wire is the positive wire on fan #2? Is the positive wire, terminal 87 on relay 1?

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Re: 3 relay cooling fan wiring - - - > question

Post  spence on Sat Apr 02, 2011 6:14 pm

Nevermind... I just re-read what you wrote...

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Re: 3 relay cooling fan wiring - - - > question

Post  Admin on Sat Apr 02, 2011 8:07 pm

Are you using the factory fans?

If so, why are you going through all the trouble of rewiring them. All you have to do is hook up two simple wires from the PCM to the factory 2 speed relay and your done. NO wire size to worry about , NO wiring diagram to worry about , NO finding fuses and hiding everything to look right.

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Re: 3 relay cooling fan wiring - - - > question

Post  spence on Sun Apr 03, 2011 7:28 am

Admin wrote:Are you using the factory fans?

If so, why are you going through all the trouble of rewiring them. All you have to do is hook up two simple wires from the PCM to the factory 2 speed relay and your done. NO wire size to worry about , NO wiring diagram to worry about , NO finding fuses and hiding everything to look right.

I'm not using the factory fans. I had to buy a new fan setup because the shop that I sold my old engine to took my radiator and my old fans. I'm using fans from a v6 ford contour.

I never knew you could re-use the factory fan relays. I just seen the relay diagram posted and figured it was the way to correctly wire the fans. Remember, there's no instructions on anything on this car and I'm not a engineer or mechanic. Maybe someone should write a "complete" swap manual! Hint hint... lol

I'll be using the relays and harness I've created. I've already hid all the wires and I think it looks pretty good.

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Re: 3 relay cooling fan wiring - - - > question

Post  Arthropraxis on Sun Apr 03, 2011 10:10 am

Now I am glad for dragging my feet on the wiring. So, the GM PCM will control the Porsche relays, without having to use the thermofan switch?

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Re: 3 relay cooling fan wiring - - - > question

Post  Admin on Sun Apr 03, 2011 11:04 am

Yes.It's a two , simple ,wire hook up.

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Re: 3 relay cooling fan wiring - - - > question

Post  spence on Sun Apr 03, 2011 11:28 am

I've got the high speed and low speed fan wires ran to the front of the car. Can I just hook these two wires up to the old thermoswitch wires If I were to use the old fan relays?

Do the high speed and low speed wires need to be hooked straight to the relays themselves?

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Re: 3 relay cooling fan wiring - - - > question

Post  spence on Sat Apr 09, 2011 7:14 pm

I've got my fans wired and I've confirmed that they're working properly; I ended up using the 3 relay setup. Thanks 944-LT1 for posting that diagram.
The car started first try after sitting all winter! I'm surprised since the gas in it is almost two years old. Next up is the brakes; I just got my hubs back from the machine shop and they're ready for the boxster rotors!

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Re: 3 relay cooling fan wiring - - - > question

Post  Arthropraxis on Sat Apr 09, 2011 10:35 pm

I am going to do the 3 relay setup after looking at the price of the Porsche fan relay.

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Re: 3 relay cooling fan wiring - - - > question

Post  Bluemach1 on Sun Apr 10, 2011 11:39 am

Sticky this thread in electrical modifications or Wiki? Looks pretty useful for reference.

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Re: 3 relay cooling fan wiring - - - > question

Post  Arthropraxis on Fri Apr 22, 2011 9:17 am

When hooking into the Porsche fan relay with the GM high and low speed fan relay wires, does the high speed fan relay wire hook to TF and low speed to TS in the diagram below?
http://www.servimg.com/image_preview.php?i=20&u=14651638

I change my mind on the two wire hookup or 3 relay system on a daily basis. Today, I am all for simple.

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Re: 3 relay cooling fan wiring - - - > question

Post  xschop on Fri Apr 22, 2011 10:32 am

IIRC the PCM HI/LOW FAN relay leads are called to ground (-)


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Re: 3 relay cooling fan wiring - - - > question

Post  Arthropraxis on Fri Apr 22, 2011 12:00 pm

The Porsche fan relay is ground activated from the thermofan switch for the fan motors, also. The high/lo fan relay wires from the GM ECM should splice into the Porsche coolant temperature switch wires going to the Porsche fan relay. GM Hi speed to the RT/WS (red/white) colored wire labeled TF on the fan relay. The low speed GM would splice to BR/GE (brown/yellow) wire going to TS on the Porsche fan relay. Is this correct?


Last edited by Arthropraxis on Sat Jun 11, 2011 2:55 pm; edited 1 time in total

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Re: 3 relay cooling fan wiring - - - > question

Post  Marky522 on Fri Apr 22, 2011 9:05 pm

Yes, the GM PCM sends a ground signal to activate the fans. I wouldn't recommend using any of the Porsche original system, its pretty simple to wire it like gm did, easier on the electrical components, and less likely to catch your car on fire. I have the diagram on my laptop if you need it.

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Re: 3 relay cooling fan wiring - - - > question

Post  Arthropraxis on Fri Apr 22, 2011 9:23 pm

Thanks, I have the 3 relay diagrams. I know so little about this it makes me easily influenced and I change my mind daily. The two wire hookup is going to be easier, the three relay system is how the ECM was designed to work.

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Re: 3 relay cooling fan wiring - - - > question

Post  spence on Sat Apr 23, 2011 1:01 pm

here's what I ended up doing. I had to remove the windshield washer reservoir to get some extra space to mount the relays and my alarm siren. It was cracked somewhere and leaked anyway. I ran all the wiring down a channel where the hood sits. I used a 10ga wire to the battery with a 40amp fuse. I already had the 30/40 relays and harnesses so I used them. Will see how long they last. I'll eventually replace them with some 40/50's or higher.




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Re: 3 relay cooling fan wiring - - - > question

Post  robstah on Sun May 01, 2011 11:09 pm

Admin wrote:Are you using the factory fans?

If so, why are you going through all the trouble of rewiring them. All you have to do is hook up two simple wires from the PCM to the factory 2 speed relay and your done. NO wire size to worry about , NO wiring diagram to worry about , NO finding fuses and hiding everything to look right.

Are you just grabbing the two wires under the fuse/relay panel?

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Re: 3 relay cooling fan wiring - - - > question

Post  Arthropraxis on Mon May 02, 2011 11:03 am

Yes, from what I can tell from the electrical schematics. Basically, you are replacing the switch that is in the Porsche radiator with the GM ECM. I like this idea, cut and splice two wires and simplify the fans and A/C system control all at once.

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Re: 3 relay cooling fan wiring - - - > question

Post  Arthropraxis on Sat Jun 11, 2011 3:01 pm

I took the high and low speed Porsche relay wires from the thermofan switch at the radiator. The thermofan switch won't be used so I cut the connector off and pulled the wires back through the harness covering on that side, routed them over to the passenger side and soldered them to the respective GM high/low speed fan relay wires.

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Re: 3 relay cooling fan wiring - - - > question

Post  Admin on Sat Jun 11, 2011 4:44 pm

That's the way to do it! Very Happy

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Re: 3 relay cooling fan wiring - - - > question

Post  B.Rudy on Tue May 29, 2012 10:35 am

Arthropraxis wrote:I took the high and low speed Porsche relay wires from the thermofan switch at the radiator. The thermofan switch won't be used so I cut the connector off and pulled the wires back through the harness covering on that side, routed them over to the passenger side and soldered them to the respective GM high/low speed fan relay wires.

Any updates on this idea? Has anyone had ANY problems with there fans being wired like this? How many trouble free miles have you put on your "new Porsche"?

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Re: 3 relay cooling fan wiring - - - > question

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