Hello and welcome to Just Answer.
Under which conditions do you hear the noise?
When I first start it up, or when it's idling. It has stopped, coincidentally, since the air conditioner quit. However, when I lived in Seattle, I heard it as well, as it was not related to the ac, because I rarely used the ac there. My mechanic replaced some belts, and it was quiet for awhile, and then it came back. I have some fluid dripping from the passenger side, onto the garage floor, as well.
Does the interior blower fan work?
Can you see if teh ac belt is still in tact?
Are you still there?
I made a typo. I meant the ac belt. The drive belt for the ac compressor.
Does the ac panel display light up or does is go dim?
No problem, just respond when you get a chance.
I'm in Arizona.
If the ac panel does not dim and the blower doesn't work on any speed, it is most likely the blower motor itself.
I'm thinking the rattling is something to do with the ac compressor because this model has a notoriously noisy compressor.
I would start with the fan and see if it blows cold once the fan is working.