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06-23-2024, 08:36 AM
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#1 |
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Senior Member
 
Join Date: Nov 2013
Location: East Tennessee
Posts: 2,187
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Fan issue with AC trinary switch
'67 C10 with '02 LS1
I'm running the Entropy LS swap radiator with dual fans. Fan 1 is wired to the PCM only, it triggers the relay at 195º, it works perfectly. Fan 2 is also wired to the PCM to trigger at 205º and it's also wired to the trinary switch and connected to the same trigger (ground). The fan will come on via the trinary switch or the PCM or both ( I assume) I'm getting a code P0481 (fan 2) when I have the AC on and the PCM triggers the fan 2 relay. I did find a loose connector in my load center for the fan 2 relay but I fixed that. I'm wondering if the trinary switch and the PCM fan trigger being wired together is causing the issue, and what is the best/easiest way to correct it?
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1967 C10 Step side 1968 C10 Step side 1970 Chevrolet K/5 Blazer 1972 Chevrolet K/5 Blazer ............. 
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06-24-2024, 07:05 AM
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#2 |
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Senior Member
Join Date: Nov 2013
Location: East Tennessee
Posts: 2,187
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Re: Fan issue with AC trinary switch
I rewired the fans and separated the PCM trigger and the trinary switch ground triggers
__________________
1967 C10 Step side 1968 C10 Step side 1970 Chevrolet K/5 Blazer 1972 Chevrolet K/5 Blazer .............
Last edited by A1971Blazer; 07-01-2024 at 05:02 PM. |
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06-24-2024, 07:05 AM
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#3 |
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Registered User
Join Date: Apr 2012
Location: Chatt Tn
Posts: 977
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Re: Fan issue with AC trinary switch
computers don't like additional stuff. you need to wire it thru a relay were its either or, not wired together.
__________________
88 military v30 crewcab shortbed 5.9 cummins, nv4500, 205 86 k30, 89 diesel burb, 76 gmc pathfinder 71 longbed 5.3 4l80 http://67-72chevytrucks.com/vboard/s...d.php?t=522535 |
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06-24-2024, 07:08 AM
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#4 | |
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Senior Member
Join Date: Nov 2013
Location: East Tennessee
Posts: 2,187
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Re: Fan issue with AC trinary switch
Quote:
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1967 C10 Step side 1968 C10 Step side 1970 Chevrolet K/5 Blazer 1972 Chevrolet K/5 Blazer .............
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06-24-2024, 09:58 PM
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#5 |
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Registered User
Join Date: Apr 2012
Location: Chatt Tn
Posts: 977
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Re: Fan issue with AC trinary switch
cool, thats how I was thinking just wasn't sure how to explain it!
__________________
88 military v30 crewcab shortbed 5.9 cummins, nv4500, 205 86 k30, 89 diesel burb, 76 gmc pathfinder 71 longbed 5.3 4l80 http://67-72chevytrucks.com/vboard/s...d.php?t=522535 |
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07-07-2024, 09:26 PM
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#6 |
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BMW & ASE Master Certified
Join Date: Feb 2004
Location: Houston, Texas
Posts: 1,266
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Re: Fan issue with AC trinary switch
id say best bet, wire it like OE and never look back.
a/c wiring  https://ls1tech.com/forums/attachmen...ingfansbu6.gif fans  https://ls1tech.com/forums/attachmen...ingfansbu6.gif so when wired like oem, both fans run together at 1/2 speed (because both motors are powered by 1 relay). and when high speed is requested due to a/c on signal or coolant temp, both fan run at full speed since its running 1 fan on each relay seperatly. clint
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1987 Silverado - L83 5.3 w/ 6L80e ,A/C,P/W,P/L,TILT, HID projectors, Wilwood C-10 Pro Spindles w/ 2018 silverado front brakes & C-5 Corvette Rear Disc Brakes 1999 BMW 528i - 5.7 LS1 w/ 4l60e, Ford 8.8 IRS w31 spline posi & FX-r projector retrofit New project: 2006 BMW x5 6cyl AWD to L83 6l80e 4wd to 2WD / RWD A poor man buy's it twice finally got my domain name back, 87chevy.com.... site rework in progress |
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