Hi all Right, got an audi a3 2001 plate avu engine, had a waterpump 15k miles ago, cant remember if its a plastic impeller or metal one, had a thermostat last week, new temp switch and stuff and fan kicks in. right i have no temp displayyy so i felt the pipes, lots of preassure and very hot to touch. now, other day, went on the motorway, 70+ got home, rad is stone cold as is lower rad pipe, but other pipes hot and very preassurised, no coolant loss, never boils over or anything. got vag com, when heater on hot with air blowing getting around 90-96 degrees, when its on cold with no air blowing i get 108 which i assume is too hot, having no dash readout does not help, thats the instrument cluster. so issue is, airlock, bad thermostat, faulty waterpump, bad rad? blown h/g? Please help.