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Get yourself a AA Battery, tape a wire to either end, ideally a red and a black to make it clear. Then touch the wires to the speaker terminals and if the speaker cone moves out then the polarity is as indicated by your wire colours. This doesn't work as well on some tweeters.
From dialogys
Max. engine speeds for a coolant temperature < 75°C 6,700 rpm
for a coolant temperature > 75°C in 1st or 2nd gear 7,200 rpm
for a coolant temperature > 75°C in 3rd, 4th or 5th speed 7,000 rpm
Gear change indicator light illuminating approximately 300 rpm before the maximum engine...
The standard box has two entrances. The aft hole has a tube that runs under the box and ends in a bellmouth next to the radiator just behind the headlight. The fwd hole is fed via a tube to an ecu controlled butterfly valve in the wheelarch area. Neither would be sucking in excess hot air.