A/C blower Motor

Tiny
HAVASUROB
  • MEMBER
  • 1999 FORD F-250
  • V10
  • 4WD
  • AUTOMATIC
  • 165,000 MILES
1999 ford f-250 4x4 super duty, V-10 gas motor. My A/C works great, the blower motor stopped working. Fuses all look good. The last few months it would cut out alot sooner while going up small grades and towing things.I would have to let off onthe gas so the blower would kick in. Now nothing. Rob
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Monday, July 11th, 2011 AT 8:09 PM

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Tiny
HAVASUROB
  • MEMBER
Im a single parent, and just got laid off work. Im sorry about not donating anything.I knowyou guys work hard helping people. Rob
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Monday, July 11th, 2011 AT 8:16 PM
Tiny
RASMATAZ
  • MEMBER
Get to the blower motor and power it from the battery if it comes on, inspect and test the blower motor relay, resistor and blower switch
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Monday, July 11th, 2011 AT 8:26 PM
Tiny
WRENCHTECH
  • EXPERT
The comment about the blower coming back when not on the throttle makes me ask is the blower is switching to defrost instead of shutting off. The mode selection is done through a series of air doors that are operated by vacuum. When there is either a partial or total loss of vacuum, the system will default to either defrost or on some vehicles, heat. Acceleration can also have an effect on the doors for the same reason.

Look under the hood for a small black plastic hose coming through the firewall. Follow it to the vacuum source looking for any breaks, cracks or leaks. Also follow any other lines that branch off because they may go to a vacuum reservoir (storage tank) and a leak there will cause the same problem. Using a vacuum gauge to determine if you have full vacuum at any given point is the best way to find it. You can cut into the line anywhere and splice it back together with a piece of vacuum hose. Find the broken line, you found your problem.
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Monday, July 11th, 2011 AT 8:32 PM

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