Electric/Aux Fan working and not working...

[jagarundi]

Hello Forum, I hope someone can drop some knowledge on me about the following:

This weekend it was hot as hell in NYC so I turn on my AC. I'm getting practically hot air except for when I'm in motion. NOW...this happened before and it turned out to be my Auxiliary fan that had to be replaced. This was over 2 years and some change ago. Here's the funny thing though. I pop the hold and look at the fan. It's motionless. I pull back the grill and give it a good manual spin and the thing fires up and starts spinning! I get back in the car and the ac is behaving rather nicely. I pull off but a few minutes later, the fan stops spinning and the hot air returns unless I'm in motion again. Obviously, the fan is functional because it DOES spin when I give it a manual whirl and it stays spinning at least for a little while. Can someone tell me their opinion on what they think it is?

My second conundrum is this irritating, chirping sound that seems to be coming from the alternator/area. It gets louder when the ac is on but stays chirping all the time when I'm idling at the light or in park. Thoughts?

BTW...I changed out my FSR last summer so all is good there....