Hello, I have installed the Flex-a-lite fan kit, and it all works fine. I have a question about the "proper" way to wire into the A/C control lines. I've done research on this site and other, and there is a bit of confusion on my part.

I've located all the necessary wires to tap into, just not sure which is the correct one.....

If I want the Fans running when the function swithch is turned to A/C, then I want the purple wire at the A/C pressure cutoff switch.

If I want the Fans running when the A/C clutch is engaged, I can tap the Blk/Yellow wire at the top of the A/C clutch diode.


Or should I tap in between those 2 locations at the red/yellow wire after the A/C pressure cutoff switch?


1) Do I want the fans running all the time the A/C is turned on, or just when the A/C clutch is engaged?

Pros/Cons of each?

Oh, if it matters, truck is a 2001 F150 2WD

Thanks

 

I have mine setup to run when the compressor cycles (clutch engages) or tapped into the signal wire as they say. Mines grey with a white stripe I believe. I tapped into this below the fuse box. I like how it works, seems factory this way. Most cars from the factory have this, so it seems normal.

 

Mine is set up like BLUE20004X4's. I am going to install a toggle switch in the cab in the A/C signal wire to the controller, though. I want the faster warm up in the cold weather without the fans running and the defroster on.

 

You're right BLUE, it was a gray/white wire on my truck too.

The wiring diagram I have says it's black/Yellow.

That is kinda strange that the A/C compressor runs when the function switch is set to defrost. Anyone know why that is, or found a way to modify the switch to not do this?

I'd rather not wire in a shutoff switch in case some else is driving, and they don't know about the switch (if I left in the off) position.

Thanks

 

A/C compressor runs so it gets used during the rest of the year. Otherwise there are issues with the clutches and pulleys locking up.

That's the beauty of wiring the switch into the A/C signal wire. If you turn it off, the fans will still come on at the set temp. If you run a "off, no matter what" switch then you could have the problem that you speak of!!

 

The AC runs in defrost because air out after being cooled is much drier. For defrost, dry air is best. Has nothing to do with the compressor or pulleys freezing up.

 

Well, a quick search brought up information that supports BOTH of our answers!

But, whatever makes you happy!

 

QUOTE:
Well, a quick search brought up information that supports BOTH of our answers!



Works for me!

 

While that may be a side benefit of using the defrost in cold weather, that's not the engineering reason for it. TNC was correct, it's a drier air thing. Our trucks are made to run in all temps, regardless of climate....Phoenix to Minneapolis...whether it's hot all the time, cold often or if you go through all seasons.