Thank you guys,

I replied yesterday but it didn't post. I have exhaust manifold sitting in car from previous owner. I looked at it and it exhaust manifold looked like black and worn out. That whole area is smeared with black greasy stuff. I have set up appointment with mechanic this saturday to have a look.

The bell type noise( wind chime), I replicated in my parking lot and can hear coming from rear wheel behind driver side. It is audible only at low speeds and especially going over uneven surface. Is wheel bearing problem, i can fix myself. Also, when I turn on AC and at some settings, it start making this type of noise
Squealing noise from drive belts - YouTube.
I have tested AC before and it takes time to start cooling but do to some extent but didn't test it now. I tried moving the ac compressor while car was parked with the pulley cable but it slackened a little bit but ac compressor didn't move.
I have also noticed that sometimes my central Unlocking doesn't work. Not all doors get unlocked. I was going through the vacuum lines and saw the Y shaped rubber hose between yellow and green plastic box is slightly cracked.

Sorry, I don't know the exact technical terminology so being verbose.

Any pointers will be appreciated.

Thanks,

Dracs