I have a 2006 Nissan Sentra that has a squeaking sound when I start the engine. After the engine has been driven a while, some of the squeaking subsides. I had one of my belts replaced 4 years ago. What is the likely cause of this squeaking?
Squeaking sound in the engine especially in colder weather.
Could be one of the belts or belt tensioner. Start the engine and get your ears under the hood to find which one.