Originally Posted by tabetha

What he said^^, but would like to add that I wouldn't bother with a s/h matrix if needed just not worth the hassle if no good, last one I bought for mk3 was around £27 new, from radiator place, the better ones are coming from poland these days pattern wise.
You need to distinguish between air flow and heat, the fan controls the flow of air(speed) the matrix puts the heat in, so if poor heater but heater fan is going round really fast it is most likely matrix/or stat at fault.
Normally really really good heaters on mk3/4.
tabetha