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04-28-2003, 11:46 AM | #1 |
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Member#: 12455
Join Date: Nov 2001
Location: CA
Vehicle:02 WRX |
Installing fan switch
I am trying to install additional fan switch control to turn on the radiator fan sooner. The stock fan turned on at 205ºF, I want it to turn on at 180ºF. Anyway, everything is set and ready to go. I found the wire that drive the two fan 1 relays, and I got an auxilary temp switch hook up to the radiator and it is working. My concern is how the ECU send out the signal to switch on the fan relays. Anyone know if the ECU send the signal to the fan relays by turn on another set of (mini) relays, or if the ECU switch the fan relay directly by its interal circuit? The reason is if the ECU switches on the fan relays by another relay(s) then it is ok to apply power to override the ECU control of the fan relay. Otherwise, I need to think of something else. Please help, I am one connection away from lower engine temp.
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04-28-2003, 12:04 PM | #2 |
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Vehicle:'02 t-rex wagon platinum |
THIS IS JUST A GUESS
i really doubt the ecu turn on the fan directly as the ecu would need a hefty IC to handle the inrush current from the relay coil. my guess is that it turns on an IC which turns on the relay.....OR, the fan is not control by the ecu at all......it is triggered on the the coolant temp sensor take your pick |
04-28-2003, 02:37 PM | #3 |
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Also keep in mind that if you did not change your thermostat, you won't get much cooler. You'll end up running the fans all of the time, or the thermostat will not open...
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04-28-2003, 02:46 PM | #4 |
Scooby Newbie
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Join Date: Jul 2002
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Fan is controled by ECU.
you can get HKS fan controler to do this job. I believe around $120. It controls 2 fans main and sub fans by setting temperature independently |
05-16-2003, 07:36 AM | #5 |
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Join Date: May 2003
Location: Melbourne FL
Vehicle:03 WRB |
OK what wires are they (color and location) all I want to do is be able to turn on the fans when I want to and still have them turn on when the by the ecu if my switch is turned off??? Please
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05-16-2003, 10:09 AM | #6 | |
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Location: Glendale Hts, IL, USA
Vehicle:2000 NFR AP1 S2000 '07 Honda FIT sport (5MT) |
Quote:
Or by Hayden's for $20... Jorge (RiftsWRX) www.ProjectWRX.com |
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05-16-2003, 11:30 AM | #7 |
Former Vendor
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Why do you want to turn on your fan so low? Definately not needed at all, and 210 is still well within the range for the car to be at water temp wise.
Adam |
05-16-2003, 11:41 AM | #8 | |
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Vehicle:2000 NFR AP1 S2000 '07 Honda FIT sport (5MT) |
Quote:
Plus.. the consistency of performance is 100% Jorge (RiftsWRX) www.ProjectWRX.com |
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05-16-2003, 12:17 PM | #9 |
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RiftsWRX--
Where did you get your Hayden switch and PWR? |
05-16-2003, 03:53 PM | #10 | |
Scooby Guru
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Quote:
I'll have the full DIY and parts list by late tommorow morning, or I'll get ambitious and do it today after work. Jorge (RiftsWRX) www.ProjectWRX.com |
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05-17-2005, 12:52 PM | #11 | |
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Quote:
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05-17-2005, 01:36 PM | #12 |
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^^^2nd that. Its hot as hell in florida.
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05-19-2005, 03:15 PM | #13 |
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06-26-2005, 09:55 AM | #14 |
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Vehicle:2008 FSXT WRB |
So if I just wanted to hook up a manual switch and not the Hayden unit, I just need to feed the middle tab of the relay 12 volts? Or is it like most other cars and a just need to switch a ground on the relay?
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06-29-2005, 03:15 AM | #15 | ||
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Location: Glendale Hts, IL, USA
Vehicle:2000 NFR AP1 S2000 '07 Honda FIT sport (5MT) |
Quote:
Quote:
Jorge (RiftsWRX) www.ProjectWRX.com |
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