"The floor isn't drying because it's too cold."

Translation: Le sol ne sèche pas parce qu'il fait trop froid.

[Lng52-._]

Can one use "car il" (instead of parce qu'il...)?

[hhzhang]

Yes, but note that there are some subtle differences between "car" and "parce que". See this thread for more details.

[InvertedGo]

The implication here is that the weather is too cold, not the floor.

I wonder if it accepts ...parce qu'il est trop froid if you mean that the floor is too cold.

[InvertedGo]

Apparently it does.

[Sucy-en-Brie94]

Le sol ne sèche pas car il fait trop froid. Accepted :)