So, 3 weeks ago I went to the park. Parked my 2010 Honda Civic LX-S, I was at the park for a couple hours, then I went to go home. I got in the car and started it, it started fine, I started to reverse out of the parking spot and it made a loud hiss noise, as if a bunch of air blew out somewhere. It was very loud, like a lot of pressure.

I parked it and towed it home the next day. Started it up and it ran for a bit then I gave it as and it mad that noise again.

The car while idling is making some kinda knocking noise, but goes away when i give it a little gas. My dad suggested to take off the belt, so I did and started it. It started fine and the knocking was gone, sounded good again. I moved it into my driveway, and it sat for a day because I had work. The next day I put the belt back on and started the car, and it ran fine. No knocking, nothing.

I drove it for about 2 weeks, and while driving over the next two weeks I noticed that the AC wasn't nearly as cold as it was before. So it led me to think the problem had to be with my compressor.

A couple days ago I drove to work, shut it off, got off work and started it, and it made that knocking noise again, then it made that loud hiss/pressure blow noise.

Today I took the off the AC Compressor and bought a new one. Started it and seemed fine, then drove it a bit, and the knocking came back. Came home and smelt a weird smell.

I have no idea what it can be and could use any help.

Also I forgot to mention after it broke down the first time. The battery was dead, I bought a new one (Warranty), drove it the two weeks and was fine then when it broke down again, the battery again went dead when i went to pick it up the next day. Today I i charged the battery, now about 10 hours later the battery is dead again.

Quick summary, Car seems to run fine when belt is off.

Video of what happens. Watch til the end to hear the Pressure Blow noise

 

take the belt off and spin all of the pulleys until you find one that is very rough which is likely the culprit

 

I forgot to mention, I have already done this, and all pulleys seemed to turn just fine

 

did it die when it gave out air?
alt is tight? have alt checked. sounds like a bad alt. but besides that either ac leak and ac clutch is kicking on shoot any left over pressure out.
check ac Freon level? or did you fill it back up?

for sure if its %100 air. you looking at either ac leak or air/vacuum from motor i.e vacuum leak. pcv valve
doesn't sound like anything to do with the belt. id raplace it though if cracked and worn.
check tensioner if its still holding.