HVAC INTERIOR FAN BEGINS TO BE INTERMEDIATE AT ALL SETTING BUT HIGHEST SETTING. THE RESISTOR FAILS ON ALL BUT HIGHEST SETTING. SHORT IN WIRE HARNESS STARTED A SMOLDERING FIRE AT CONNECTOR. ALL RESISTORS ARE OPEN AIR AND RUSTED ASSUMED DO TO ITS PROXIMITY TO THE EVAPORATOR. FAILURE EXACTLY LIKE THIS ONE EXPERIENCED BY OTHER OWNERS. HTTP://WWW.F150ONLINE.COM/FORUMS/ARTICLES-HOW-TOS/378955-HEATER-BLOWER-FAN-FIX-ONLY-HIGH-SPEED.HTML. *TR