For those of you who are installing two speed fans, I am offering an in-line coolant tube with a dual temperature switch. The outside diameter of the tube is 1-1/2" which is a common inside diameter of the upper radiator hose on Jeep vehicles. The set up includes the coolant tube, duel temperature switch, Volvo two speed relay. These relays are used but are tested. The kit also includes another relay and a diode for AC use. A schematic will also be included as a guideline. All parts can be sold separately.
It will work on an XJ, WJ, ZJ and TJ.
For the low speed the temp kicks in at 203 and shuts off at 185..
High speed the temp kicks in at 215 and goes back to low speed below 188... I installed this setup with a Ford Taurus fan on my WJ and TJ without any issues with the AC going full blast in 100dgr temps.