Yep - aftermarket fans, mechanical and electrical, are tested in an open shop in free air, clamped into an old Wilton vise - the closest radiator stack is in employee's cars out in the parking lot - that is necessary to get the huge CFM ratings from a wimpy fan unit, ratings which catch the eye of those into specmanship: mine's bigger'n yers

FYI: don't even remove the 165hp factory fan - add a switch to turn-on the factory auxiliary fan for some added cooling-on-demand - just tap into the ECM control terminal on the relay in the convenience center - instructions'n'pics in CRD TECH section.......................

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'05 CRD Limited
Pricol EGT, Boost
GDE Hot '11; EDGE Trail switched
SEGR; Provent; Magnaflow;
Suncoast T\C, Transgo Tow'n'Go switch;
Cummins LP module, Fleetguard filter, Filterminder
2.5" Daystar f, OME r; Ranchos; K80767's, Al's lifted uppers
Rubicons, 2.55 Goodyears
Four in a row really makes it go

Both my 1995 BMW M3 and my 2005 Toyota Tundra have mechanical fans from the factory.

- Chris

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Used to own:
2006 CRD Sport
Suncoast TC, Transgo shift kit, Inmotion, ORM, EHM, Magnaflow SS exhaust, Fumoto valve, EVIC added, Hensley TruControl brake controller, Pirelli Scorpion ATR LR-D in spring/summer/fall, FIA winter front and Blizzaks in winter