Worked last night. This morning -7* not working. Almost froze on the hour long drive to work this morning. Replaced the resistor/ relay assembly this morning only $25 at Napa. Still not working. I verified the blower is working by jumping the blower to the battery. I have battery voltage into the resistor plug harness but not out to the blower motor leads. Any Ideas? Thanks. I have an appt. in the morning at the Chevy dealer near me.