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I back flushed the heater core on my wife's Passat, B5. I used a clear hose for the exit hose and a standard black hose for the entry hose. I flushed in both directions and was able to see the crud come out of the clear hose. (it didn't look like much of anything was in there but evidently it was enough to lose heat.) Also I just used the spray nozzle on the garden hose and slow increased the pressure. I don't know how much psi was used but I didn't use full pressure.
I also recommend you replace the coolant in the entire system at the same time.
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"A good sense of humor is the best thing to have in your toolbox when working on these cars."
Quote by Charles Freeborn, Pelican.
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