I have a Maytag dryer, model# DE303, series# 05, serial# 130050 V0. The tumbler works fine, and it still blows ait, just not warm air. I was told it could just be a fuse, but I was thinking heating element. I can't even find a fuse box. Can anyone help?

If it is electric then a element is a very good possibility. If it is gas a ignitor is probably in order. There are many parts that control the heat besides the parts I mentioned. It really should be checked out by a knowledgeable person before replacing parts is considered since just blindly replacing parts can get expensive.