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Performance Upgrades - Maintenance - Modifications - Problem Solving - Off-Road - Street Trucks. Covering the Explorer, ST, Sport, Lincoln Aviator, Sport Trac, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Aerostar. Featuring H.I. - Human Intelligence.
I discovered that there was no change when I switched from defrost to floor on the climate controls. I took out the radio and other parts so that I could see the vaccuum servo motor with the yellow vacuum line...on the drivers side. It appears that this servo controls the defrost door...