I get a very strong burning smell after driving with the heater on for more than about 20 min. I had all belts/hoses inspected and nothing was found. I know nothing about Hondas or much about cars at all. I popped the hood and looked around, and could smell it, but didnt see anything. Its a 99 Accord with 62k on it, and it does not leak/use oil and no fluids are low. Any ideas?