fan switch
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Joined: Oct 2002
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From: Kalamazoo, Michigan
I have thought about doing this also. I would think that all you have to do is find out which of the two wires going to the fan is the positive, run your switched positive from the cabin and splice into it?
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Joined: Mar 2006
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From: Gurenderu
if its anything like honda's older engines, then it should be pretty easy.
you need to find the thermo fan sensor on the block. it should be a two wire sensor with a black rubber boot. take the rubber boot off and youll find two plugs. one of those plugs is the ground (and probably black colored) and the other goes to the sensor to the fan relay (its yellow and green on a crx).
leave the ground wire alone and take off the other plug. then get another piece of wire, strip the end an inch, then jam that into the plug, then jam the plug back into the sensor. kind of a ghetto splice, but you dont have to cut the original harness this way. cut and splice if you wish. then take your wire to a switch. then connect the other pole of your switch to ground.
basically, how the fan works is the thermo sensor on the block is normally open, not connecting the fan relay power to the fan, when it reaches a certain temperature, it will ground out the fan relay which will signal the fan to turn on. my method of doing it just bypasses the thermo switch, yet still allows the thermo switch to operate just as it would normally.
if youre good with reading electrical diagrams, heres what im talking about. this shows it also wiring the AC fan.
the other way ive seen ppl do it and the more obvious is to find the power line to the fan and splice into that with a relay to the battery or another 12V source. basically bypassing the original fan relay. this is fine, but personally i think my method is easier and more effective since the stock fan relay should be working fine, why make a redundant relay.
you need to find the thermo fan sensor on the block. it should be a two wire sensor with a black rubber boot. take the rubber boot off and youll find two plugs. one of those plugs is the ground (and probably black colored) and the other goes to the sensor to the fan relay (its yellow and green on a crx).
leave the ground wire alone and take off the other plug. then get another piece of wire, strip the end an inch, then jam that into the plug, then jam the plug back into the sensor. kind of a ghetto splice, but you dont have to cut the original harness this way. cut and splice if you wish. then take your wire to a switch. then connect the other pole of your switch to ground.
basically, how the fan works is the thermo sensor on the block is normally open, not connecting the fan relay power to the fan, when it reaches a certain temperature, it will ground out the fan relay which will signal the fan to turn on. my method of doing it just bypasses the thermo switch, yet still allows the thermo switch to operate just as it would normally.
if youre good with reading electrical diagrams, heres what im talking about. this shows it also wiring the AC fan.
the other way ive seen ppl do it and the more obvious is to find the power line to the fan and splice into that with a relay to the battery or another 12V source. basically bypassing the original fan relay. this is fine, but personally i think my method is easier and more effective since the stock fan relay should be working fine, why make a redundant relay.
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