On Mon, 27 Apr 2009 15:55:06 -0400, Pedro Sanchez IV
In addition to the things already mentioned, it could be the blower
motor itself. I've had them with the brushes so worn that they only
speed where they got enough power thru the brushes to fire up was
Possible, but excedingly rare occurrence. You would generally get s
chatter, or it would start on bumps.
BIGGEST problem on Ford the last ten years has been wiring
connections. (at least on mine - it's 13 now and has had more
connector failures than any 2 other problems combined (vaccum leaks
and suspension have been the other 2 issues).
I have a 2003 Taurus. Here was my real problem: when the plastic
molding on the outside of the car at the bottom of the windshield on
the passenger side would warp, rain water gets on the resistor block
and the heater motor. If I remember right I replaced both through
the glove box opening or from inside the car. First the resistor
block, then a few weeks later the motor died. I then had the Ford
dealer install their Ford retro fit kit that corrects the rain water
problem, it drains the water differently than the original molding did.
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