Altima Fan Setup

[undesiredshoe]

I have some altima fans that im going to put on soon and i was reading up on ways on how to wire it up. Theres the manual switch method, the "On when ignition ON" method, and the thermo switch method. I like the thermoswitch method the most, so i was wondering if i could do something like this...



Its kinda messy but ill explain it

Since each fan has 2 speeds, i want to wire both fans to come on at low speed and both to come on at high speed. The low speed would be connected using a relay. The relay switch would start at the ACC and through the relay, then through a thermoswitch. Then the 12V would come from the battery and split into two wires to power both fans on low speed.

The high speed circuit would come from the AC Fan Plug. The positive wire would split into two wires and connect to the other positive on the fan and be grounded.

If this would work, then the low speed would come on at 180* and stop at 170* via the thermoswitch and just incase the low speed isnt enough, the high speed would come on at around 200* via the ecu's AC control thing and hopefully stop at around 180* for the low speed to take over again.

Sorry if this is really basic stuff but i just want to get your guys opinions

[rsxrcr87]

Id like to know if this would work also I have a set to put on

[forum04pl]

hmm... try it out and let us know, mine are currently done "when the ignition on" method

[95Blue240sx]

I dont know the exact specs of the altima fans, but it would seem like a lot for one relay to handle. I believe its only rated for 30a.

Why not run one fan as a low speed, and have the other come on when needed via the stock temp switch? If you really feel the need to run both at high, you can have a switch for the one that runs on low to run on high.

[undesiredshoe]

well i could always use two relays, thats easy. I also forgot a inline fuse...what rating should i get?

[MELLO*SOS]

if you're running a stockish KA without AC, one fan on high will be adequate. I have mine wired with one fan on high off the ACC relay, then I have the other fan wired up to the AC switch in the car (I have no functional AC). Looks like you've done some research on this already, but check the link in my signature for more info on the altima fan wiring...

I believe you may end up running more than one relay to switch them from high to low. But it should be possible similar to what you have laid out there. Just pick up the fans and do some testing and you'll get it figured out quickly. You seem to understand the wiring and relays decently enough, it'll be easy for you.

Not sure on the fuse rating, I would assume 20-30a each fan would be acceptable. Never measured the current draw on mine. The fuse is there to protect against short circuit, so whatever size doesn't blow under normal use will be fine.

GL

[Big Bronze Rim]

That setup wil work fine, but I would use two relays. You could use 2 seperate switches with different on/off points if you want to stagger them, or you could just tie the relay coil grounds together and then pass it through on thermo switch. I did a writeup on FA a while back on wiring up altima fans using a fan controller and listed what wire colors a pin locations correspond to high and low speed. I figure this is a good place for them. For low speed operation you would only use one pair of wires on each fan. You could use relays to trigger high and low speed, but I think for simplicitys sake, just stage the fans wired on high speed. I just supplied power to both relay contacts because on a fan contoller, when the car is off the coil ground is open. If using a thermo switch you will want to wire it to ACCY like you have shown, or the fans will run when the car is off and the thermo switch is closed.