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jimh · 27-01-15, 08:26 PM

Maybe you could take the valve out and replace it temporarily with a bit of hard pipe to join the hoses to see if the valve is at fault?
If it's still no better, it does sound like you have an air lock or blockage in the heater matrix.

27-01-15, 08:26 PM	#14
jimh Grown up member Classic Audi Club Member Join Date: Dec 2008 Posts: 122	Maybe you could take the valve out and replace it temporarily with a bit of hard pipe to join the hoses to see if the valve is at fault? If it's still no better, it does sound like you have an air lock or blockage in the heater matrix.