OK, Rob, before we jump to conclusions:
When you run the dryer, can you FEEL air blowing from the outside vent? No? You have a clog. Yes?:
I'm assuming you have an electric dryer. Check the OUTSIDE breakers. Make sure BOTH breakers work - an electric dryer is 220v, and it has both "legs" of the 220 coming into the house.
Just for grins, check the incoming voltage on the plug (it's a goofy 220v plug). Make sure you have 110 from each leg. Still ok?
You likely have a bad heating element. Is the dryer over 5 years old? If so, consider replacing. Otherwise, look up the cost to replace a heating element. But, at this point, you are likely throwing $$ at it - and a new dryer is probably a cheaper option.
Bill
215g FOWLR... and anemones, GSP, gorgonians... carp, that isn't FO!
"I killed my first SW Fish in 1971..."