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RepairPal Certified shops can diagnose and repair your 1999 Ford Expedition. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
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So disconnect the air dryer from the pump and feel for air flow?
Should I disconnect the hose lines from the drier and feel for air or remove the drier and feel air from the pumps unit?
(Update) I removed the drier from the pump and felt air moving when the pump was on but i don’t know how strong the air is supposed to feel when it’s pumping. It wasn’t strong but it wasn’t weak either.