I've noticed the Pentastar 3.6 in our new 2013 Dodge Grand Caravan makes what sounds like a low pitched power steering pump whirring noise on cold start, that lasts a good 30sec or so. It's loud.
I'm not sure which rolling element it's coming from, but it sounds like a slow spinning hydraulic pump until she warms up a bit. Once warm, it's quiet aside from a slight exhaust rumble- also odd given the size of the muffler and resonator on the beast.
I'm not sure which rolling element it's coming from, but it sounds like a slow spinning hydraulic pump until she warms up a bit. Once warm, it's quiet aside from a slight exhaust rumble- also odd given the size of the muffler and resonator on the beast.