Another possibility is the alternator decoupler pulley is slipping upon engine start. Pulley makes noise until the rotor is brought up to matching speed with the pulley.. . . Hey guys I have trouble with my 2013 Town and Country.
After sitting overnight it makes this awful sound on cold start. Noise goes away after few seconds. The more colder it gets outside the more intense the sound happens to be. . . . .
Seems to be drivers side, transmission area.If the noise is still present with the belt off, it is not from the idler or pulley decoupler.
Can you locate the noise source or get closer to it?
Is it at the front (passenger side) of the engine, like from the timing chain/oil pump area?
Noise usually dissappears before I put the car into gear.Does the noise change when putting it into gear?
Any transaxle service history?
Does the pitch change with engine speed?