1997 Audi 80 2.0 Cab Overheating Please Help !!!! [/align][hr]

HEY EVERYONE I HAVE JUST BOUGHT A 97 AUDI 80 CAB WHICH IS OVERHEATING AT HIGH REVS LIKE OVER 60 MPH

I HAVE TAKEN THE WATERPUMP OFF AND IT LOOKS FINE I ALSO TOOK THE THERMOSTAT OUT IT WILL TIC-OVER FINE BUT ALL OF A SUDEN THE HEATER WHICH I LEAVE ON GOES COLD AND THE TEMP AND THE PIPES FROM THE RAD FEEL HOT AND FEEL LIKE THERES FAR TO MUCH PRESSURE IN THEM

IF I PRESS THEM A FEW TIMES IS SEEMS TO GET THINGS MOVING AGAIN I'VE TRYED TO BLEED IT BUT NOT SURE WHICH IS THE RIGHT WHY TO DO IT ...I'VE JUST TAKEN THE PIPES OFF TO THE HEATER MATRIX TILL THE WATER COMES UP....

CAN ANYONE HELP ME.... CHRIS[/align]