heater fan still runs with motor shut off

1999 FORD F-250
110,000 MILES • V8 • 4WD • AUTOMATIC
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AWPIPPIN
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1999 Ford F250 4wd full size 4 door 4.6
You can turn the heater fan on even with no key in the ignition. If you don't shut the heat off, it will run the battery down. Why is this?
Mar 11, 2011 at 10:09 AM
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WRENCHTECH
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Is it an auto temp control system or manual?
Mar 11, 2011 at 10:49 AM
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AWPIPPIN
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manual
Mar 11, 2011 at 12:20 PM
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WRENCHTECH
  • ✓Experienced Mechanic
  • 20,760 POSTS
That would have to be due to a stuck-on blower relay. It's located under the dash on the driver's side.
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Mar 11, 2011 at 12:38 PM
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