Heater not very warm

[2008tdihighline]

A few months ago I replaced the secondary coolant pump and a hose. Had issues getting air out the system for a few days. I get coolant out the overflow pipe and no warming up issues and the car sits at 90 degrees all day long.

Problem is, my heater is only luke warm. Could I have air in the matrix? Will removing one of the matrix hoses in the bulk head help?

Also, could it be my heater blend? Is there any way to check this on vcds?

Thanks

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