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Old 06-10-2019, 04:41 PM
dhutton dhutton is online now
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Originally Posted by 72Z/28 View Post
I have OEM ECU with blue and red connectors. Dark green wire (pin 42) and Dark Blue wire (pin 33). Both going from ECU or PCM to fan relays.

Both fans come on as soon as turn on the AC even with cold engine.

By the way, I have a recovery tank not the expansion tank

I have found so many threads in LS1Tech regarding wiring cooling fans and AC with binary or trinary switches. Unfortunately, I could not find a clear schematic that shows wiring trinary switches with dual fans and compressor.

I am just sick of going through the cooling fans wiring, relays as I have to trace all the crapy wiring done by the stupid electrician. This may require dropping the vintage air evaporator just to trace one stupid wire.

Just do not feel like doing this as I have recently rearranged the big mess on the dash wiring, and I still cannot figure out why the stupid tach and speedometer on classic instruments do not work.
At least one fan should come on when you turn on the AC if you are using a binary switch. It has nothing to do with the engine temperature.

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Old 06-11-2019, 09:53 PM
randy randy is offline
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located near dallas at all?
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Old 06-12-2019, 06:10 AM
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72Z/28 72Z/28 is offline
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Originally Posted by randy View Post
located near dallas at all?
Thanks Randy for the offer, well appreciated.
Unfortunately I do not live in the USA.

I have drown a rough schematic of cooling fans wiring along with compressor and Binary Switch.

I am going to share the link soon to my instagram, and hopefully someone could go through the schematic and correlate with how the fans are operating now based on information given in my previous posts
72 Camaro RS:SOLD
68 Camaro:
LS6 Engine,Tremec TKO 600,5 Speed
Complete Speedtech Subframe Kit,Speedtech Torque Arm, 9" Rearend from Strange, Wilwood Brakes, Minitubbed, Hotchkis Subframe Connectors, FIKSE FM5s
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