run engine to get it hot with right fan connector disconnected; have test light grounded and inserted into connector; when temp reaches 217 F and left fan comes on watch to see if test light comes on (when left fan comes on). if test light comes on then check the fan for poor ground

next you gonna test the relay

 

The fan relay powers both fans so the problem has to be between the plug and the motor. Should be a breeze to isolate problem.

Mark

 

Do you have a service manual?

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Mark

 

deleted

 

Thanks for the advice guys, there was a blown fuse, however this fuse was labeled "Signal" and was a 7.5 fuse. There is a separate fuse for the left and right fan, and these where fine! Replacing this fuse solves the issue... Which seems strange!

Unless I read the labels wrong, I will take another look some point when I get time. But yeah for anyone else reading in the future it was a blown 7.5 fuse within the fuse box next to the radiator.