I forgot I bought some sliced packaged cheese and I left it in the car, it was out for about 1.5-2 hours. It is an unopened package.
Does anyone know if that is a problem?
If it wasn’t hot enough to cause the slices to melt into a pile of cheeselike goo, then I wouldn’t worry about it.
Full disclosure: I also leave leftover pizza out on the kitchen counter all night so that I can have it at room temperature for breakfast.
I wouldn’t worry about any food for an hour or two. Certainly not American Cheese in an unopened package. I would think it could sit like that for a few days and not go bad.
Judging by the ingredients you could probably leave it there all summer. You do realise that it has only a slight relationship with cheese don’t you? (I had never heard of it so looked it up)
Real or “fake” cheese can sit out for a few days. That’s one of those foods that if it looks and smells fine, it is fine. Assuming that you aren’t sensitive, but then you probably shouldn’t be eating cheese anyway.
Cheese is/was just a way to preserve milk without refrigeration, after all. It just happens to be extra yummy.
I don’t think people refrigerate cheese in Europe unless they plan on keeping it a long time.
P.S. I’ve taken all sorts of cheese camping with no problems, even with…less than desirable storage. Also, I have been to grocery stores where they have a bin of Kraft Singles on special with no refrigeration (for that day, anyway).
Cheese doesn’t really go bad. It may dry out or get moldy, but it doesn’t really spoil.
If this was the stuff in the individually-wrapped “slices” (they’re actually poured into those little plastic envelopes), and the entire package was unopened, I wouldn’t start worrying about it for at least a year.
If it was something that started as a block of cheese and then sliced, and packaged at a factory, and still unopened, I’d give it at least a month before I even bothered to look at it.
If it was actual slices that were packaged at the grocery store, I wouldn’t worry about it for several days.
And in all of these cases, no matter how long it was, if there wasn’t anything obviously wrong with them, I’d still eat them.
moldy cheese is spoiled, no matter what fanciful name you give it 
the smell should be the first hint of that.
With some block cheeses, I will put a third in the fridge, a third sealed at room temperature, and a third unsealed at room temperature. I may leave them all for a few weeks. The different storage gives them different textures and flavors. I’ve never worried about them going bad.
Not so!
I buy cheese by the half pound or one pound and it often gets moldy before I finish it, even refrigerated. The mold consists of areas, “splotches” you might call them, up to an inch in surface area, and less than one mm thick.
When that happens I just scrape the mold off with a knife and eat what’s underneath. No GI or other problemmos, none, and we are talking about in decades.
When I take a sandwich that has American cheese on it to work, I will intentionally leave the sandwich out of the work fridge so by the time I get around to eating it, the cheese tastes more gooey than it does coagulated.
I was talking about “blue” cheeses, which are utter garbage. seriously, it’s shit. it smells and tastes like cheese that someone ate and puked up to be served again.
Spoiled implies it’s not suitable to eat, which is not true. In fact, many popular cheeses get their distinctive taste from mold.
yes, I know. and those of you who enjoy that taste are quite mentally ill
It’s fine. I used to get cheese mailed to me from California to central China. It can handle an hour out of the fridge.
On the other hand were you to find something growing on such a product within 2 hours of exposure you’ve probably also discovered a viable biological weapon.
American cheese is only one molecule different from plastic. 
It takes me over an hour on average to put away groceries. So, I wouldn’t even think twice about it.
Yep, take away the cheese molecule, and put in a plastic molecule instead, and you’ve got plastic.
An hour? Are you feeding an army or do you shop once a year?