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bypassing the ECU's fan control

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Old 03 February 2009, 02:32 PM
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thewhitewarrior
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Default bypassing the ECU's fan control

i am having trouble with the fans not coming on, on my project RS200 IMPREZA, (look in projects), is there a way i can put in a thermostat sensor so it can make the fans come on, like they used to on older cars, thanks phil.
Old 03 February 2009, 05:06 PM
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Turbotits
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I would have thought its fairly straight forward. Fit a sensor off something like an old fiesta which is just a temp swicth . wire it to earth a relay and bring the fan on.
Old 03 February 2009, 05:10 PM
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vindaloo
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Originally Posted by thewhitewarrior
i am having trouble with the fans not coming on, on my project RS200 IMPREZA, (look in projects), is there a way i can put in a thermostat sensor so it can make the fans come on, like they used to on older cars, thanks phil.
If you can find the right place, you can attach the right switch to the outside of a coolant hose. Then you just need a fused connection and feed to the fan(s).

Question: What is the right switch? I dunno, you'd have to take advice on that one... On my old Astra, the switch was a substantial chunk of brass screwed into the rad. Similar may work....
Old 03 February 2009, 05:49 PM
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thewhitewarrior
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just as i thought, it cant be that hard, its only the earth in the sensor after all. well i have a few more things to try, but if i cant use the original fan plugs, ill get looking under the hood of some fiesta's at the scrap yard for a sensor, thanks very much lads.
phil.
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