series and parallel using relays

Hi guys, im trying to figure out how to wire up my thermo fans in my car, so that on 'Low speed' both fans are wired in series so they are getting 6v each, and when high speed is activated(via computer or manual overide switch) they are wired in parallel and recieve 12v each. I think ive worked it out, just looking for clarification and/or possible other ways to wire it with more/fewer relays Any help appreciated Heres my diag so far... Please excuse the crude drawing and my handwriting! haha

also just incase you cant read my writing, when the Low speed is active, only it has power. But when High speed is active both Low/High wires have power, i can easily change this to just Low - Low, High - High if need be to make it easier

anybody??

https://www.the12volt.com/relays/page5.asp#spvrBuild the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

That looks like how I'd imagine a doctor would draw a schematic- Did you try out the fans in series to see if they're doing anything useful that way? It might be like fans in movies that spin more for visual effect than cooling. The slower the fans spin in the movies, the hotter it's supposed to be, especially when interrogating the suspect-

It must be a high current diode. I wonder what it is for?