I'll assume you checked for simple stuff like a loose splash guard in the wheel well, and that your tires are not wearing too unevenly. ff so, your wheel hub bearing is likely going out. If you are a DIY'er, raise the front end, place safety jacks per mfg specs, and grab the top and bottom of the wheel (at 12 o'clock and 6 o'clock). Try to wiggle it. If the wheel has play in it, it has a bearing that is probably going bad. Disclaimer: if you're unsure, take it to a pro.
Anytime I've ever heard a humming noise when turning the steering wheel on any vehicle,It has always been due to low power steering fluid
Check and see if your power steering fluid level is low.
because something is about to break.
Bad steering rack? Bad steering gear? Pitman arm?
Typically, it may start to make a fairly loud humming noise, especially when turning the steering wheel (a little noise is sometimes normal). It may also 'pulse' when turning the wheel or while driving straight. While turning, steering may intermittently become stiff and then easy. The power steering fluid reservoir may be low (this should be checked regularly and never be allowed to run low). Power steering fluid leaks may be present (check for spots under the vehicle and/or 'wet' power steering lines and components). Also, many shops can help diagnose the problem for little or no cost. Try and find one you trust and take advantage of their expertise.
The 2012 Dodge Grand-Caravan's turning circle is 39.1 ft..
The 2010 Dodge Grand-Caravan's turning circle is 38.0 ft..
The 2004 Dodge Grand-Caravan's turning circle is 39.4 ft..
The 2006 Dodge Grand-Caravan's turning circle is 39.4 ft..
The 2013 Dodge Grand-Caravan's turning circle is 39.1 ft..
The 2008 Dodge Grand-Caravan's turning circle is 39.4 ft..
The 2007 Dodge Grand-Caravan's turning circle is 39.4 ft..