RepairPal Certified shops can diagnose and repair your 1998 Lincoln Navigator. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
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You could have an engine that is not getting hot enough, or a temperature blend door motor in the dash that is not working. Check the inlet and outlet hoses for the heater core -- very hot? Both? If so, it's a blend door issue.