LexusPartsNow.com offers the wholesale prices for genuine 2006 Lexus GS300 parts. Parts like Heating & Air Conditioning - Cooler Unit are shipped directly from authorized Lexus dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 3.0L, 6 Cyl 3.5L, 8 Cyl 4.3L.