With the car idling right after you start it....turn on the AC. The low speed fan should come on...pretty quietly, and just run....no loud fan sound cycling on and off.
Next, if it is warm out, turn the AC off, and let the car idle....after a few minutes, the low speed will come on.....as the car sits for quite a bit longer...the high speed should turn on for a minute or two at a time...and return to the low-speed...so it will get louder, then quieter....
A good hard drive, then parking it, and letting it idle for a bit will do the same thing too!! IF the car is driven very hard, the heat is stored to a certain extent in the cast iron block, and the car will actually get hotter in the first few minutes after you stop driving it....that is why at auto-x events, folks are usually told to putt around a bit to keep the air flowing (parking and jst idling is not as good, since there is less airflow), and to keep the oil+coolant pumping, to aid it in cooling off....the extra airflow beyond what the fan provides helps lots!!
A ODBII tool, on US cars, and I'm assuming similar tool on your car, acn monitor the exact temp the fan is turned on, and may even be able to signal the fan to turn on...but the later is usually only found on higher end shop tools.

Sounds like at $500 he might have given you a bit of a break on the laboe maybe...I hope....it unfortunatly sounds like you had more than one issue....since your fan WAS broken, to operate properly, it did need replacement...in the short term, I guess you could have ignored it....but if it caused other issues later...like a broken AC compressor...it would cost you more $ in the end! Congrats on getting the car back!! Enjoy!!

 

I may have misread your earlier posts. Sounds like there could have already been an issue with the fan...

 

If you have a scangauge, you can test this in your driveway depending on your ambient temp - on the road mine runs at a steady 193F.

Per the Bentley manual, and confirmed by my ScanGauge, the fan operates at low speed at 221F, and turns off at 214F. The fan switches to high speed at 234F and remains on high until the coolant temps drops by 7F. Supposedly it also turns on when the AC is on and the AC system pressure reaches 8 bar (114psi)
As Zippy said, the low speed you have to watch it spin, as you can't really hear it. The high speed, not so quiet.

 

Darn.. I don't have ScanGuage installed.

Really worried.. Been driving it today on drives that'd usually have invoked the buzz of the fan kicking in, yet I haven't heard squat. And it's possible I'm paranoid, but there were (very) faint whiffs now and then of engine smells - although no noises and no temp warning light or anything like that.


Turned AC on and wasn't able to hear a fan at all.. Maybe it's too quiet.. Quite concerned though.

 

just open the hood and look....the Low speed stage on the fan is nice a quiet....it does not roar like a woodchipper or an airplane like the high speed mode you got used too!! I very rarely ever hear the high speed!!