I did take out the side of my PC I have a lot of fans in it. But the fans are pushing air inside the PC should they be backwords?

Fans push air OUT. They shouldn't be drawing air in. There should be a natural vent for air to come in on its own, the fans push it back out. Um, I didn't know it was even possible to install fnas backwards anymore.

If yours are pulling air in, are there more than one fan? Are sure at least ONE isn't blowing out?