Been meaning to get my heater sorted the past two years now, summer rolls around and it just seems unimportant.

There is zero heat coming from the driver side and just a little from passenger

I suspect the heater matrix is blocked, coolant tank looks ok and silicone doesnt appear split

Can the matrix be flushed out without replacing and if it needs replaced how do i determine the correct part and i read a thread last year on different shapes of matrixes. Cant seem to find it

For others information i looked at your profile to see that it is a 2.0 TDI vRS you show as having.