hello there a problem thats just occured, i was taking my children home on the motorway and when i came off at my exit i noticed my engine racing while i was coming to a stop at traffic lights, I also noticed engine was racing when stationary, The temperature gauge rises to the red and when i noticed when i got out of the car a hissing sound coming from the engine and also a small amount of fluid on the floor near the radiator, looked like antifreeze, the car has been serviced a few months ago and have never had a problem like this, and help or suggestions please, also the exhaust is blowing