If you are looking for replacement parts for your European vehicle that are OE quality, then you want Rein. In German it means "pure", so you know you will get a high quality part that will fit and function correctly. Rein offers a wide variety of European car parts like radiator hoses, engine and transmission mounts, air filters, and suspension control arms just to name a few. They are a subsidiary of German auto giant Continental AG, so you know their parts are the best available.
One of the most common parts to require replacement in your HVAC system is the blower motor resistor, so make sure to test it when diagnosing any heating problems.