It's winter here and as my car warms up it starts to tick. It doesn't happen right away, only as the car warms up and it gets progressively louder until a certain point at which point it seems to stop (or has faded significantly). It primarily happens in idle and in gear but will go away after revving above a certain point (around 1500-2000rpm). If I put it in neutral the noise is greatly reduced or disappears completely unless I rev it from about 1000rpm-1500rpm. Once the car reaches operating temperature the noise is gone. Any idea what it could be? The sound appears to be coming from the top of the entire. Also, it doesnt seem to do this when its warm outside. I have a 2011 sonata GLS and I change the oil every 3000 miles. I use either Bosch filters or OEM filters so I know the filter has nothing to do with the ticking. Please help me. Thank you.