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If your vehicle does not have factory a/c this knob is most likely for the passenger side fresh air vent. If your vehicle had an after market a/c installed; the vent control may me inoperable, or the vent may be blocked.

2006-12-03 20:37:26
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Q: What is the white knob located on the passenger side dash on the 1988 Ford F-150 for?
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