Knocking and sometimes clicking noise when I turn on a/c

Asked by Jun 17, 2017 at 11:46 AM about the 2001 Ford F-150 XL Extended Cab LB

Question type: Maintenance & Repair

Knocking sometime clicking noise when I
turn on a/c so I located the noise
disconnected a  electrical plug that I think
runs small motor and  noise stopped...what
is the problem and was it safe to disconnect
that motor at all

1 Answer


So this sounds like a vent door motor under the dash? Probably lost some air flow or directional air flow in the dash. I'd replace the motor unless it's going to be a major pain like tearing most of the dash apart. Many of these motors have teeth on them that strip and then click as you mentioned. Seems to be quite a market for mini plastic gears since people try to replace just the gear.

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