 Water Cooled Question, Fan sequencing / works great! |
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| 76-914 |
  Dec 6 2013, 11:18 AM
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#1
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Repeat Offender & Resident Subaru Antagonist  Group: Members Posts: 13,502 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California 
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For my Suby 6 conversion I've installed a twin fan system (from a Dodge) on my radiator. One is single speed (3 wire) and the other is 2 speed (4 wire). Which one of these 2 fans comes on first? Do they both run at times? Will I use the 2nd speed of the 2 speed motor?
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| BIGKAT_83 |
Dec 6 2013, 04:58 PM
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#2
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Senior Member Group: Members Posts: 1,798 Joined: 25-January 03 From: Way down south Bogart,GA Member No.: 194 Region Association: South East States 
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I would turn the two speed on first at low speed and then when the temp increased switch it to high speed with the second fan.
On my car I turn on both fans at half speed at 190 degrees and if the temp gets to 200 degrees both fans go to full speed. This is easy to do using 3 relays. Slow speed is the fans wired in series and then put them in parallel for full speed.  |
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| andys |
Dec 9 2013, 01:21 PM
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#3
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Advanced Member Group: Members Posts: 2,165 Joined: 21-May 03 From: Valencia, CA Member No.: 721 Region Association: None
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QUOTE(BIGKAT_83 @ Dec 6 2013, 02:58 PM)  I would turn the two speed on first at low speed and then when the temp increased switch it to high speed with the second fan. On my car I turn on both fans at half speed at 190 degrees and if the temp gets to 200 degrees both fans go to full speed. This is easy to do using 3 relays. Slow speed is the fans wired in series and then put them in parallel for full speed. Bob, I've got three different schematics of this setup, but this is the best I've seen. Yeah, I love the low/high speed function, but oddly enough, it stopped working. My manual fan low/high over ride switches work, so the PCM signal is somehow not getting sent. Time to do some troubleshooting! I'm thinking GM coolant temp sensor failure? I'd like to test it; would you happen to know the resistance values to look for? (slight hijack) Thanks, Andys |
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| BIGKAT_83 |
Dec 9 2013, 01:45 PM
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#4
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Senior Member Group: Members Posts: 1,798 Joined: 25-January 03 From: Way down south Bogart,GA Member No.: 194 Region Association: South East States
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QUOTE(andys @ Dec 9 2013, 02:21 PM) QUOTE(BIGKAT_83 @ Dec 6 2013, 02:58 PM) I would turn the two speed on first at low speed and then when the temp increased switch it to high speed with the second fan. On my car I turn on both fans at half speed at 190 degrees and if the temp gets to 200 degrees both fans go to full speed. This is easy to do using 3 relays. Slow speed is the fans wired in series and then put them in parallel for full speed. Bob, I've got three different schematics of this setup, but this is the best I've seen. Yeah, I love the low/high speed function, but oddly enough, it stopped working. My manual fan low/high over ride switches work, so the PCM signal is somehow not getting sent. Time to do some troubleshooting! I'm thinking GM coolant temp sensor failure? I'd like to test it; would you happen to know the resistance values to look for? (slight hijack) Thanks, Andys The GM LS1 sensor (thermistor) is 29k ohms at -20 degress C and 180 ohms at 100 degress C. |
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Posts in this topic
76-914 Water Cooled Question Dec 6 2013, 11:18 AM
mikesmith
For my Suby 6 conversion I've installed a twi... Dec 6 2013, 11:29 AM 76-914 I'm using the stock OEM Suby ECU. Dec 6 2013, 12:30 PM mikesmith Based on a quick Google search, it looks like ther... Dec 6 2013, 02:40 PM
mgp4591
I would turn the two speed on first at low speed ... Dec 6 2013, 06:28 PM 76-914
I would turn the two speed on first at low speed ... Dec 7 2013, 08:41 PM BIGKAT_83 Started with a EG 3.3 and have since changed to a ... Dec 6 2013, 06:34 PM
mgp4591
Started with a EG 3.3 and have since changed to a... Dec 6 2013, 06:50 PM Tom Old engineering principle , KISS. The more complic... Dec 6 2013, 07:17 PM mgp4591
Old engineering principle , KISS. The more compli... Dec 6 2013, 09:06 PM Mike Bellis I have mine on a dual thermostatic relays. They al... Dec 6 2013, 09:33 PM 76-914
I have mine on a dual thermostatic relays. They a... Dec 7 2013, 08:43 PM 76-914 Help :blink: I'm trying to figure this schema... Dec 8 2013, 08:41 PM Mike Bellis
Help :blink: I'm trying to figure this schem... Dec 8 2013, 09:22 PM Tom Kent,
It looks like both pins 33 and 42 would n... Dec 9 2013, 02:16 AM Chris H. Kent,
Don't want to throw a wrench into thin... Dec 9 2013, 09:48 AM BIGKAT_83 You can cool these subarus with almost anything. T... Dec 9 2013, 10:24 AM Chris H. What the... Bob you have one of every motorized th... Dec 9 2013, 10:31 AM CptTripps That is an awesome setup! Lots less intrusive ... Dec 9 2013, 12:29 PM CptTripps I'm having one hell of a time locating a radia... Dec 9 2013, 07:12 PM Mike Bellis
I'm having one hell of a time locating a radi... Dec 9 2013, 08:02 PM skeates
I'm having one hell of a time locating a rad... Dec 10 2013, 01:08 PM Mike Bellis
A little "confection" goes a long way i... Dec 10 2013, 07:39 PM BIGKAT_83
I'm having one hell of a time locating a radi... Dec 10 2013, 05:49 AM 76-914 Mike & Tom, Thanks for explaining things to me... Dec 9 2013, 07:27 PM BIGKAT_83
Mike & Tom, Thanks for explaining things to m... Dec 9 2013, 07:34 PM 76-914 Spoke too soon. I see relay 2 powering Fan #1 @ hi... Dec 9 2013, 07:44 PM CptTripps That got me thinking...what about the front radiat... Dec 10 2013, 10:07 AM Mike Bellis
That got me thinking...what about the front radia... Dec 10 2013, 10:27 AM CptTripps YeH, that's what I'm thinking too. Looks a... Dec 10 2013, 12:35 PM 76-914 Got my fans & relays wired in tonite :Qarl: I... Dec 12 2013, 10:12 PM Chris H. Gotta bump this great thread...Just a quick questi... Aug 25 2014, 11:22 AM 76-914 Es verdad, Christo. Looks funny but think of stack... Aug 25 2014, 05:20 PM Chris H. Cool thanks Kent! Just seemed weird not groun... Aug 25 2014, 05:22 PM 76-914 Thought I'd add this bit of info re: this styl... Sep 1 2014, 10:06 AM messix
Thought I'd add this bit of info re: this sty... Sep 1 2014, 10:54 AM |
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