Hello, Dorman does not state that you are required to use their radiator in conjunction with the fans. The fans you have from Dorman are OE replacements, so yes, the radiator you are looking at is compatible with your vehicle and Dorman product. Please see this link for other radiators (most of which are in stock and ready to be shipped) https://www.carid.com/2003-volvo-s40-radiators/?filter=1&fitment_type%5B%5D=Vehicle+Specific