I've got the same faults on mine, it seems that the heater element fails eventually. There are two fuses, one for each side. The passenger side heater is in the front passenger side fusebox, and the drivers side is on the drivers side fusebox. Both fuseboxes are on the end of the dashboard.
You have to replace the whole assembly, its not cheap and the front seats and carpet need to come out to even get to them.
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Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
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