TC Mod - New Twist - Ford Powerstroke Diesel Forum
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Old 07-29-2014, 06:56 AM
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TC Mod - New Twist

OK, I'm looking to use the TC Mod to enable an electric fan on the AC condenser. I'm looking for a way to energize an electric pusher fan relay when the AC compressor clutch is engaged AND the torque converter is NOT locked up. That way when the truck is at speed, the fan will turn off. The AC cools fine when the truck is going down the road, it is just in stop and go traffic that it get a little warm (AC temperature, not engine temperature, the engine never gets too warm). Is there a wire that is energized when the TC is locked? I know the purple/yellow is the ground, but I'm having trouble getting my hands around a control circuit to stop the fan when the TC is locked up. Any help?
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Old 07-29-2014, 07:34 AM
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But, if that Ground is to the Lock-Up alone (and I don't know that it is...) then that's all you need. Just have that ground (again, if usable) complete the coil circuit in a relay, thus "opening" the relays NC contacts, and stopping power from flowing to the fan.....

BUT, I'm not sure why this should be necessary in the first place. If your AC starts blowing Warm when not at HiWay speeds, something wrong ;(
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Old 07-29-2014, 08:38 AM
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Thanks NoRalPH. It's not that it blows warm, it just doesn't blow as cold as it does going down the road. I've installed AC units on multiple street rods with dedicated electic fans blowing on the condenser and it does make a difference at low speeds. I guess I was thinking it might help with the truck also.
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Old 07-29-2014, 09:28 AM
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I'm thinking something like this might work.
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Old 07-29-2014, 11:28 AM
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3 relays though? Wouldn't 2 do?

You couldn't just take the power coming from the AC clutch and let it ground through the TC activation and supply the fan at the NC side of it? (as the "interrupt") Then just have another relay to only supply that Fan Power when the clutch is powered before it...
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Last edited by NoRalPh; 07-29-2014 at 11:35 AM.
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Old 07-29-2014, 11:37 AM
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KISS principal!!! I usually make things more complicated, when I really don't want to.
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Old 07-29-2014, 03:48 PM
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Yea, I'm a Big KISS fan (not the Band.... )

I was really Rackin' my Brain trying to figure how to do it with One.
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Old 07-29-2014, 04:24 PM
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i wouldn't bother with all that. do it the standard way with a temp sensor in the rad and keep it simple. once you get moving, temp drops, fan shuts off

mine is the same way, warms up a little at idle while not moving. i think i might do the electric fan in front of the condensor also. it would help the trans cooler out too.
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Old 07-29-2014, 04:26 PM
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and i've read about others fixing the same a/c problem with a new condensor. i hate taking the truck to a mechanic to discharge and recharge though.
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Old 07-29-2014, 05:41 PM
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Can we run an electric fan clutch from a 6.0?
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air conditioner, electric fan, torque converter

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