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You can't get your fan to quit blowing through the defroster in my 2002 Ranger it won't blow through the dash vents or the floorboard vents Does it work off vacuum or electrical system?
Wiki User
∙ 18y ago
The system works off of vacuum. A line from the engine vacuum manifold runs to a 3 inch ball shaped reservoir (mounted to right front wheel well), then another line to the Heating-Ventilation-AC system. If air will only blow out the defrost vent, then there is likely a vacuum system problem. Remove the engine vacuum source line from the ball shaped reservoir and confirm that the there is vacuum while the engine is running. Then remove the HVAC line from the reservoir and connect it directly to the engine line. If this works while the engine is running, then you have a cracked or leaking reservoir.
Wiki User
∙ 18y ago
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