you mean the engine temperature will increase? The car is not doing that, and its always 100 F everyday here in Texas

I will still try the test again, should the ignition be in position 2 for the test as well?

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2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles

(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)

With my '96, if the air conditioning is running and the M4 auxiliary fan doesn't start when needed, the high-side pressure and temperature very quickly raise to higher levels than they should, and the engine coolant temperature increases as well, although that stays under 100C.

The key should be in position 2 for the fan test. The engine can be running or not. I use that test while driving, if I want some extra cooling for the engine.

My car doesn't need the auxiliary fan at all without the air conditioning running. With it, the fan is essential.