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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.
My '02 Explorer makes a constant "thump...thump...thump" noise in the ventilation system under the dash when the temp control knob is turned past the blue "cold" setting. It sounds like a vent flap is not engaging. I don't know if it's a vacuum hose issue or what. I appreciate help narrowing...
I have a 2002 Explorer that makes a constant "thump...thump...thump" sound somewhere in the ventilation system under the dash when the temperature dial is turned out of the blue "cold" setting. It sounds like a vent door that's flapping.
