I had the 60K service done a few weeks ago on my 07 CS and they replaced the drive belt. The next day I noticed a squeaky pulley sound when I started the car. It went away after a few minutes of driving but is there most times when I start the car now and usually stops after driving. I started the car this morning after it had sat for a few days in 30 degree weather and it was idling pretty rough. Then the Check Coolant light came on for about 30 seconds and turned off. Wondering if this is a fading water pump? Thoughts?