HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


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).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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3 relay cooling fan wiring - - - > question

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

Post  Arthropraxis on Tue May 29, 2012 9:38 am

No problems so far. I put a few hundred miles on it without any issues with the cooling system.
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Arthropraxis

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

Post  robstah on Tue May 29, 2012 11:08 pm

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.

Awesome. Looks like I will be doing the same here soon.

So, what are you guys running for temp settings?

robstah

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

Post  B.Rudy on Wed May 30, 2012 9:11 am

Arthropraxis wrote:No problems so far. I put a few hundred miles on it without any issues with the cooling system.

cool thanks for the reply, im going to wire mine like this today!

-B

B.Rudy

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

Post  Arthropraxis on Wed May 30, 2012 11:48 am

I think these are my fan settings with a factory turbo radiator and fans using a stock 180 degree thermostat. I should have written it down.

Fan 1 on: 195
Fan 1 off: 190

Fan 2 on: 205
Fan 2 off: 195

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

Post  hutchjc1 on Mon Apr 18, 2016 12:34 pm

So if you use the harness from the Porsche temp sensor does it matter which of the 2 wires connect to the 2 wires from the pcm ? I expect to use pin 42 out of C1 for low speed and pin 32 out of C2 for high speed.
Thanks !

hutchjc1

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

Post  Arthropraxis on Mon Apr 18, 2016 5:52 pm

hutchjc1 wrote:So if you use the harness from the Porsche temp sensor does it matter which of the 2 wires connect to the 2 wires from the pcm ? I expect to use pin 42 out of C1 for low speed and pin 32 out of C2 for high speed.
Thanks !
Yes, one of the wires is low and the other is high speed and they connect to the respective wires on the LS1 PCM.
I noticed my last post in this thread was in 2012. That means I have been daily driving this car for 4 years. No issues with the temperature in the high heat and humidity of the southeast.
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Re: 3 relay cooling fan wiring - - - > question

Post  Jasonscottw on Fri Dec 02, 2016 2:02 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.

-------------

I'm thinking of trying this method vs. the 3 relays- do I understand correctly that I wire the high/low control from the PCM into the Porsche fan relay? Any tips on which wires, and the easiest way to do that?
Assuming I would wire into the relay box where the thermoswitch used to connect to the relay?

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

Post  87944turbo on Tue Oct 02, 2018 9:08 am

Sorry to necro bump this thread, but can you (or anyone else) elaborate on this?

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 assume there is a low speed input and a high speed input from the PCM to the relay?

87944turbo

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RE: Wiring

Post  Punisher948 on Thu Oct 04, 2018 6:47 pm

Yes
C1-42 is the “LOW” fan output to the relay bank
C2-33 is the “HI” fan output to the relay bank
At least for my harness, that is. I emulated my harness as a 2002 Corvette

Punisher948

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

Post  87944turbo on Thu Oct 04, 2018 9:30 pm

Yes
C1-42 is the “LOW” fan output to the relay bank
C2-33 is the “HI” fan output to the relay bank
At least for my harness, that is. I emulated my harness as a 2002 Corvette

Excellent, thanks!!

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