Had my car serviced a few weeks ago. Same day after service i drove my car on a dual carriage way for a couple miles. After coming off dual carriage way i got stuck in traffic and my car started to make like a blowing noise as if the engine was over heating. First time for my car to do this and ive owned the car for 3yrs. Then yesterday after coming off a dual carriage way i could smell a burning smell from the engine. Then today when i was back on the dual carriage way and hitting about 70mph my steering felt light. And same again car smelt like it was burning. Checked under bonet no smoke or couldnt see any leaking. But there is a dark black ring around end of exhaust. No burning smell if i avoid dual carriage way and stick to 30mph.