Quote:
Originally Posted by FerociousP
If that sensor is there, then you probably have the relay (or at least the wiring for the relay) that switches that fan on. Do you have the little fan on the front of your condensor? You can just use its wiring. You already have the FSM, but I'll post it for the others. To me it looks like the A/C control unit grounds the relay just like the switch does. I believe the idle control has nothing to do with this part of the circuit.
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That's correct -the stock ECU (S5 T2 at least) uses the A/C switch to trigger the increase in idle speed. That's independent of the water temps. But I would caution using the existing auxillary e-fan wiring as-is to directly drive the Taurus e-fan, as that sucker will draw much more current than the stock aux. fan. What you could do is use the wiring up to the aux e-fan motor, and instead of having it power the motor, use it to energize a relay, which would in turn switch a circuit sized accordingly to supply current for your Taurus e-fan. At that point you can chuck the stock aux. e-fan as the Taurus fan will be doing its job, and handle regular cooling needs, provided you swap out the stock temp switch for the Summit one that trips at the lower temperature as you suggested a few posts ago. If it were me though, I'd look for a switch that trips below 200*, like 185~195*F.