Around town, and on the freeway, my 350 SDL seems to be behaving well. Coolant temps 80-90 with AC on a 95 degree day.

As soon as I start climbing mountain passes, the coolant temps are jumping quickly to around 110 before I cut the AC and turn the heater on. Temps work their way back down quickly. If I just turn the AC off, it will float around 100.

Today, I pulled over when it was around 105 C, and checked what was going on with the fans. The mechanical fan, had a reasonable amount of air blowing strait up, meaning that if I held my hand directly above the fan, I could feel air. The electric fan on the driver side was running like crazy, but the passenger side was off. A few questions:

1. Because i have well behaved temps around town, and I can feel a reasonable amount of air moving from the mechanical fan, is it safe to say the clutch is working correctly?

2. At what temp should the second fan kick on?

3. Can anyone point me to wiring diagrams for the fans?