Not sure on your actual question, but you do t want to use WD40, use a connector/electronic cleaner. Have you checked the relay? Start at the fans and go backwards. You have already tested the fans. Now go back.
2001 ZX3 Zetec - Rebuild "The TICK" (
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2004 ZX5 SVT - Restoration "Code Name Rocket" (http://www.focusfanatics.com/forum/showthread.php?t=722698&referrerid=62897)