Candellara
Member
As an append to this, the reason i'm unconvinced the matrix is blocked is that after a simple flush - the heating system works exactly as VW intended. If the matrix was blocked - this wouldn't be the case.
My latest thoughts are that some component is causing air to be ingested into the cooling system - thus causing the heater matrix to airlock (no heat from vents) and the pressurising of the system (water being expunged from coolant bottle after long runs). This seems to only happen after long runs or after a hundred or so miles. When i "flush" the matrix - it expels all of the air, causing the system to work correctly until the next "cycle" when air is ingested into the cooling system
After some reading - EGR cooler? or EGR valve must be suspect. Is this possible?
My latest thoughts are that some component is causing air to be ingested into the cooling system - thus causing the heater matrix to airlock (no heat from vents) and the pressurising of the system (water being expunged from coolant bottle after long runs). This seems to only happen after long runs or after a hundred or so miles. When i "flush" the matrix - it expels all of the air, causing the system to work correctly until the next "cycle" when air is ingested into the cooling system
After some reading - EGR cooler? or EGR valve must be suspect. Is this possible?