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Welcome, I'm Chris (aka Moose).
Here is this circuits diagram https://dl.dropboxusercontent.com/u/90220402/lsfan.pdf
Can you verify the fan is getting power on red/yellow and green/yellow with the key on and ground on the black/yellow?
If those are good then its the wire to the PCM, or the PCM signal to blame. The PCM pulses a ground signal to operate the fan. Can you OHM test the white/black wire to the PCM to verify its not broken? Can you monitor the PCMs command to the fan and the reading on the CHT sensor using a scan tool to see if the PCM is the cause.
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Hello again Chris here,
I am contacting you because the post has not been closed or rated. We have 7 days to get a post rated before it times out. When a post times out, that means its no longer on my active list (if you reply I never know it.) You have already paid the fees to get this question answered, but it appears your not pleased, or need more help.
Let me help some more. Is there anything else you feel I could offer so you would be pleased with my help. I have the option to call you if that would be better.