Hi tonyq here ,I have an MD Elantra 2011 Sedan.
On first cold start, the motor starts, then a whinning sound sounds for 3 to 8 seconds, a sound like a jet engine starting.
Has anyone got any ideas if this is normal or is it possibly a problem,
Once started and the whine disappears, the motor starts normally for the rest of the day.
Has done this since new, vechicle 5 months old, 8000 KLMS travelled.
If your ac is on and all of a sudden you hear a fan and compressor turn on it might be your ac pulley or something to do with your ac component. To make things easier just bring it to a mechanic or dealership.