Yup. The fan can not be wired to run directly whenever the ignition switch is on because once you turn the ignition switch off, the fan is still spinning and it acts like a generator. That is where the power is coming from that keeps the engine's ignition system and fuel pump powered up.
The original fan circuit is not that complicated and should be easy to fix properly if there is something wrong with it. If the fix is expensive and you still want the fan to run whenever the ignition switch is on you would have to do that through a relay. That relay would turn off and that would prevent the fan motor from acting like a generator. Your car should have a fan relay already. What some people do is run the relay's ground wire to a switch inside the car so they can turn it on only when the fan is needed.
Friday, July 26th, 2013 AT 11:45 AM