Hate to sound like a broken record, but as mentioned in a buncha other posts you really oughta get a hvac contractor out to look at it & fix it. He probly has the part on his truck & can fix it on the spot. When your not sure you can really end up spending some bux replacing parts that dont really need replacing.
I was on a no cool call last week & the guy had a buddy out trying to fix it before he called me. The buddy replaced the circuit board & the transformer on the Carrier Furnace because he was losing his 24 volts. Turns out the contactor was shorted. So his buddy cost him about $200 in parts he didnt even need.
Good luck with getting it fixed.
Life is like a jar of jalapenos. What you do today might burn your ass tomorrow.