Blower Resistor
Remove resistor from vehicle, or disconnect wiring in vehicle. With ohmmeter, check continuity. Continuity should exist between terminals "2" and "4" (approximately 0.4 ohms), "1" and "4" (approximately 1.3 ohms) and "1" and "3" (approximately 3.0 ohms. If resistance does not exist as specified, replace resistor. See Fig 1.