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Fry Rice Specialist
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4,794 Posts
Discussion Starter #1
need it to run manually to cool down after run and can i just splice a wire and switch into the factory wires? if yes can anyone help point me to the right direction or if can't then what are my option?

thanks for the help.
 

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Dim Bulb
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3,499 Posts
You could also tap into an always hot line, run the switch, and tap that new switched line onto the power for the fan. Careful though, cause it'd be a good way to run your battery dead real easily. Also, you'd want to put diodes on each of the wires, one on the stock wiring, one on the new switch wire, before merging them into the fan
 

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Fry Rice Specialist
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4,794 Posts
Discussion Starter #4
what kind of diodes that i need? the switch that i suppose to run is before the fan relay wiring right? or i can hooked up fog lights wiring with relay and splice into the wire near the fan?
 

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3rd Gear Chirper
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2,399 Posts
Easiest way is this: Remove passenger kick panel to access PCM wiring. Then splice in a wire to the high speed fan control output. This is pin 46 on the PCM, they are numbered. You could also splice into the CCRM, use pin 17. CCRM is the relay box behind the pass. headlight. Run this spliced wire to a switch, connect the other side of this switch to ground. This will allow both you and the PCM to activate the high speed fan as needed. You WILL set a DTC by doing this, so either have your chip burned to ignore fan faults, or ignore/remove the MIL.
 

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192 Posts
if you want to run a switch-thats fine. however, starting the fan in high speed will short out the windings after a couple trys-its too much of a load to start on high speed. first you must run it in low speed-THEN and only then is it safe to switch the high speed fan on.
 

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3rd Gear Chirper
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2,399 Posts
As well-meaning as the last post was, I have never heard of this actually happening. I have had this mod on my car for a year now with no ill effects, and I do believe this is how the fan works in the OEM configuration upon startup with the A/C engaged. The way dual-speed motors are wound, no shorts will occur if the unit is in good shape, there will be more of a current draw, which means more heat, but in a fan application this should not be a problem due to the abundant airflow.
 

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192 Posts
welllll

alright-although its never happened to you, ive burned out two super coupe fans this way, and seen it cause melted wiring causing a small fire-It is true, Ive seen several cars that this has been done to with no immediate ill effects, but why take the chance? Just because it COULD work-doesnt mean its worth the risk. As for the ac-if you check the wiring diagrams the ccrm module activates the low speed circuit when the ac is switched on.
 

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Super Moderator
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11,965 Posts
charkly said:
As for the ac-if you check the wiring diagrams the ccrm module activates the low speed circuit when the ac is switched on.
you sure about that?......because that is not the case on my car......i dont know if the relay module momentarily starts the fan on low, then kicks it into high, but i know for sure that if i turn the A/C on, then go check the fan, its on high-speed
 

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192 Posts
there is the chance im wrong-Im just going by the wiring diagrams ive read for your cars-the only one i know for sure is the supercoupe, but i cant see why it would be different-my mustangs the same as well.
 
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