I just installed the Perma-Cool coolpack fan set in my 2000 1500 4x4 QC and they went in nice and easy except for the blue line. The install instructions say to tap it into the A/C switch and that you may have to consult a schematic. I have acces to various resources where this info should be located but technicians refrences don't go into this much detail as far as specific wiring. Perma-cool's tech assistance is unavailable cause there at the SEMA show in Vegas. Has anyone installed these damn things that knows where the wire is!!!!!!