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newb how to add an extra ac fan


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kenzo42 
Member - Posts: 6
Member spacespace
Joined: April 02, 2004
Location: United States
Posted: July 01, 2007 at 4:14 PM / IP Logged  

Hi, I've been trying to figure out how to wire an extra pusher fan for my AC system, now that I purchased an extra thick radiator. This is for a 94 Acura Integra.

I'd like for it to turn on w/ my regular AC fan. Can I just split it like a Y? The problem I see w/ this is that it decreases tha gauge of the wire and the fuse would likely not handle 2 fans.

I appreciate any advice given!

wlmpwlmp 
Copper - Posts: 59
Copper spacespace
Joined: December 20, 2006
Location: Canada
Posted: July 02, 2007 at 12:42 PM / IP Logged  

use a relay wired up so when the normal fan is triggered to turn on use that same signal to trigger your relay to turn on a separte circuit this way you will supply correct power to both fans. you a standard relay and connect it like this:

86-+ signal from wire that triggers the fan already in the car.

85- to GROUND

30- fused to 12 volts constant(go right to battery)

87- to one wire on your new fan(hook up so fan spins in the direction you want, you want the fan to pull air through the rad)

87a- Tape Off, you are not using this one!!

so you are gonna say now the fan has 2 wires, power from relay to one of em, and then ground the other. if it spinning the wrong way on the first try reversese your connections.

use a test light to make sure the positive trigger from the existing fan is in fact positive, if you grab the ground as a trigger this setup wont work, your new realy wont trigger. i hope this helps. i have done this in a civic in order to get the cooling fan and the a/c fan to turn on together and it works good.

WesMan
kenzo42 
Member - Posts: 6
Member spacespace
Joined: April 02, 2004
Location: United States
Posted: July 02, 2007 at 8:40 PM / IP Logged  

Thanks for the reply.

Do you just split the (+) fan signal like a Y? 

wlmpwlmp 
Copper - Posts: 59
Copper spacespace
Joined: December 20, 2006
Location: Canada
Posted: July 03, 2007 at 4:46 AM / IP Logged  
yes, for the relay to trip only requires less than 200 MA, which your current fan will not even be affected by losing this small amount of current.
WesMan
hotwaterwizard 
Silver - Posts: 1,350
Silver spacespace
Joined: December 11, 2003
Location: California, United States
Posted: July 04, 2007 at 3:34 PM / IP Logged  
newb how to add an extra ac fan - Last Post -- posted image.
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

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