I might be able to help you find the part number, but it will almost certainly be easier to read it off the existing item, provided access isn't too...
I'm not sure about that fault code, one google link to a page on rosstech forums suggests it's a code in the engine module, referring you to look for...
The speed control module. Called 'fresh air blower control unit' J126 in wiring diagrams. If you google that you'll probably learn what it looks like...
No relay. If the system is manual there will be a 'fan resistor' which is actually three resistors in series, selectively switched out of circuit as...