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On U.S.A. trucks the aux fan comes on when the AC is on. A non working aux fan will not allow the AC to cool down the car in traffic and may not allow the AC to work at all. Drive the truck and turn on the ac is the ac working, have the truck idle with the ac on and note if the fan ever comes on or if the temperature for the ac starts to rise.
If you have software such as BMW 1.4 or carsoft 6.5 or inpa you can just run a scan. The scan will tell you if you have a bad aux. fan.
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2006 Infiniti G35
2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD
Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD
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