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Are you working on a Manuel system (knobs) or an automatic (buttons) ?
And you have already replace the blower motor speed controller?
Okay that is the relay , the more common cause for the blower to fail providing the blower motor is okay is usually a failed blower motor speed controller and not the relay. Before you replace any more parts are you able to do some testing for the blower motor speed controller?
Well let start with rechecking it to be sure it has not failed. See the steps in the link below.https://dl.dropboxusercontent.com/u/104923897/Speed%20test%20Sept%2012.pdfhttps://dl.dropboxusercontent.com/u/104923897/Jump%20test%20sept%2012.pdfIf it passes the testing then the nest steps would be to check the blower and the circuit to t.See those steps here as well as the wiring diagram for testing reference. Start your testing for the blower on P1.https://dl.dropboxusercontent.com/u/104923897/Blower%20motor%20wiring%20sept%2012.pdfhttps://dl.dropboxusercontent.com/u/104923897/Blower%20motor%20Sept%2012.pdf