Adding a manual fan switch??

[mmssvv]

Yes!I did exactly what Rawze said.
I installed some 12V IngersollRand solenoid and used one of AUX switch on the dash which has wires outlet under the hood to power it.Four Years, no problem.
If you need the part number on this solenoid, I can try to find for you.
Remember-The solenoid must have three air ports.In,One normally Open and one Normally Closed.
This is necessary,because the remaining pressure between fan clutch and solenoid must be exhausted after solenoid is activated.