I don't believe what the dealer has told you is correct.
Both fans run in parallel which means they both switch on & off together. They also have a low and high speed setting, so if the coolant temp reaches +/- 102 deg (I think) the low speed fans kick in, with the high speed kicking in at +/- 110 deg (I think).
The easiest way to check fan operation is to switch on your air con - both fans should operate in the low speed setting. If they don't, you have a problem with the fan motors, wiring, relays, fuses or ballast resistors which control the low / high fan speed.
Use the search function at the top of the page - type in cooling fans and read on....
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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