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1997 Ford F-150

Tiny
JOE BOYLE
  • MEMBER
  • 1997 FORD F-150
  • V8
  • 2WD
  • AUTOMATIC
  • 112,000 MILES
My heating / air conditioning blend door opens and closes randomly. I replaced the potentiometer and nothing changed. I took it to my mechanic and he said the new potentiometer was bad because his ohm meter readings didn't change when he operated it. I tested it myself and found the readings between the first and 3rd terminals to move smoothly between.6 and 4.9 on the 20K ohm scale. I have no idea whether this is a good reading. I would like to know if the potentiometer sounds like the problem and also what operates the door - could the problem could be caused by a vacuum leak?
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Tuesday, September 8th, 2009 AT 2:38 PM

3 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hi
Actuator motor moves blend door the Pot. Varies voltage. Check term. 2 to 3 operate check ohms. Does it change?
Let me know
Thanks for donate
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Tuesday, September 8th, 2009 AT 3:08 PM
Tiny
JOE BOYLE
  • MEMBER
  • 2 POSTS
On the 20K OHM scale
Terminals 1-2 range is 4.96 to.6
Terminals 1-3 range is unchanged 4.85 4.85
Terminals 2-3 range is.67 to 4.79
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Tuesday, September 8th, 2009 AT 4:36 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
O.K. Pots good so accuator motor maybe faulty. Check motor operation center dash on top HVAC box
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Wednesday, September 9th, 2009 AT 2:02 PM

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