that info is directly from the genuine Holden workshop manual :idea3:
also - dont mind the typo's - was typing that late at night. Might have been easier to just upload a screenshot of the document
So basically, the second fan is really only a back-up and kicks in if the engine is getting really hot, the first fan fails, or the A/C needs an extra kick
And bingo - old cars like the Ecotec would work in the way everyones mentioned above, ie turn the AC on and it'll kick in, but the alloytec is different. Theres a few threads on here where people have done all sorts of things to turn it on, from changing relays to shorting out relays to removing the fan completely and checking on a test bed.
Ultimately unless your car is overheating or your AC is about to blow its load, that fan aint gonna turn on and in all my time Ive only ever had that fan turn on once, which was in the Adventra after going up a hill towing a 2 tonne load, and that was after we parked for a pie and switched the engine off - I assume it was above 108 degrees as above.
Not even a track day in 40 degree temps got it going in the Acclaim because it never got hot enough to do it, nor in any of the other VZ Alloytecs there on the day