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Heater fan still runs with motor shut off

Tiny
AWPIPPIN
  • MEMBER
  • 1999 FORD F-250
  • V8
  • 4WD
  • AUTOMATIC
  • 110,000 MILES
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?
Friday, March 11th, 2011 AT 6:09 PM

3 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Is it an auto temp control system or manual?
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Friday, March 11th, 2011 AT 6:49 PM
Tiny
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Manual
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Friday, March 11th, 2011 AT 8:20 PM
Tiny
WRENCHTECH
  • MECHANIC
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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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Friday, March 11th, 2011 AT 8:38 PM

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