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69mustang Jul 12th, 08, 05:41 AM 68 rs with factory air fan speed stays constant at all settings of the switch. Any idea where to start trouble shooting this. New resistor installed new a/c and heater core all wiring in good shape. Is the blower motor switch bad? thanks Mat Klemp Jul 12th, 08, 07:05 AM I usually start by back probing the blower relay with a test light follow the wiring diagram (available in the electrical section) to make sure you have power to the relay for the various speeds. If so then the switch is good, no need to pull apart the dash. Then check the relay and resistor in the same fashion until the problem is found. TTFN Mat | ||