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I have 2013 dodge grand caravan with a 3.6 engine. I notice on cold start that I hear a squealing noise from the engine which only lasts for a few seconds.
This only happens when the temp is very cold and does not happen when starting later in the day.
It is most likely because of a cold belt. Easy to test. Take belt off and start the car. If theres no squeal its the belt. If there is still squealing, you have bigger problems.
In cases like that,and i see it day in ,day out, in the shop,most most likely it's the ALTERNATOR belt that needs tightening;
The reason it quiets down afterwards,is because the alternator already replenished the battery charge that was spent by the starter,and also,it's warming up,getting a better grip; stil..it NEEDS tightening,(renew it,if it is very old!)it will only get worse;
There is an easier way to test ,to make sure: get a garden hose,(or just a pitch with water)and totally wet the belt and its pulleys as it is turning(engine idling): the water will act as a lubricant,and the slipping belt(if it's the case) will completely stop squealing; the water dries in seconds and all goes back to what it was like before again,but you got your answer.
