Does anybody have a wiring diagram for the clutch fan cooling circuit or a diagnostic chart for code p0526 I have already swapped out to clutch fan twice with two known good ones still throwing code p0526

 

see if this helps . Even though this says 2008 it's probably for earlier years because 2007-8 did not have an electronic fan clutch . They went back to the older more reliable mechanical fan clutch and there is no electrical connections to it . I would make sure the fan relay is working ok too . Google Trailblazer p0526 for additional troubleshooting tips .

 

Thanks but 2008 is a totally different system

 

That code says the sensor is at fault. I'd suggest with a voltmeter, check the electrical connector for +5 volts reference, and to ground, the third wire will be the signal back to the pcm