I can't help feeling that replacing the fan clutch, as described here, may be an attempt to fix problems elsewhere. The standard configuration with a 2 year old Sachs fan clutch worked well for me throughout summer with temperatures up to 40C. This with an M104 engine and 5-speed auto.

The highest engine temperature I saw after hill climbs with aircon working was 93C. Up around 5C from normal. Nothing to worry about.

If you're regularly seeing 105C when the fans kick in, it may not be a problem. That's what they are supposed to do. Maybe your weather is hotter and your hills longer!!

As said, I feel that maybe you're trying to cure the symptom rather than the cause.

Also, it's worth measuring the ACTUAL engine temperature. Gauges are not very accurate.

Good luck, anyway.

RayH