Carrier 2T Split AC problem

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asheet

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Hi
I have a 8 Yr old Carrier 2T Split AC with Hermitically Sealed compressor.

Below are the issues I am facing :-
1. Indoor Unit Fan Capacitor 2.5mfd (Just like ceiling fan's) goes bad within a few days. It had been changed by local AC mechanic. Now I don;t know what was rating of original capaictor. If anyone has any input for Cap rating, pl share asap.

2. When AC Compressor is running, cooling is good. But it makes a hissing sound (in indoor unit) which doesn't go away. Before Compressor comes on, the AC is silent. What could be making this hissing noise?
Thanks
 
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