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2000 Ford Expedition AC Issues

Tiny
DARO07
  • MEMBER
  • 2000 FORD EXPEDITION
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
My ac blow thru the defoster vent when ever its on max ac or any other selection. However when its on FLR/PNL it keeps switching between the front and defroster vents. I have already replaced the blend door actuator but I sill have the problem
Thursday, July 8th, 2010 AT 12:41 PM

8 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
I think you are looking for a vacuum leak. The vent doors are actuated by engine vacuum. When there is a leak, that is what happens. Check under the dash and the hood. If you are lucky, with the engine rinning, you may hear a hissing sound.

Let me know what you find.

Joe
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Saturday, July 10th, 2010 AT 12:58 AM
Tiny
DARO07
  • MEMBER
  • 4 POSTS
Thanks for the reply, I went under the hood and checked all the lines this weekend I head no hissing sound. However this weekend my buddy and I are going to remove the dash board and check all the lines. Since the ac isnt bowing cold in the front just cool I figure we might as well. I have ordered a blend door just in case. Anyway it will be a good experience for the both of us since he also has an expedition. I will let you know what we find if we find anything. Your input is also welcomed

Thanks
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Monday, July 12th, 2010 AT 6:47 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
Let me know. It is a big job, so pay attention to how it comes apart.
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Thursday, July 15th, 2010 AT 11:05 PM
Tiny
DARO07
  • MEMBER
  • 4 POSTS
Ok we took the dash board out this weekend and changed the blend door. However we still have the same porblem. AC still blowing in the defroster vent. I am thinking at this point it could be a eletronic switch or the vacumn. Any suggestions?

THX
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Wednesday, August 4th, 2010 AT 7:38 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
Is still say you have a vacuum leak. Did you check all the vacuum hoses?
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Wednesday, August 4th, 2010 AT 1:56 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
After thought, did you check all the vacuum lines under the dash? If so, have you checked the actuator itself?
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Wednesday, August 4th, 2010 AT 5:42 PM
Tiny
DARO07
  • MEMBER
  • 4 POSTS
I changed the actuator, it's brand new one from the dealer. I checked the lines under the hood. I didnt check those under the dash. I guess I will have to do that this weekend. I was told that there is a vacuuum under hood close to the battery that may cause that I checked but it seemed fine. Is there a simple way to check the vacuum lines for leaks? So far I have been doing physical checks it may be that I missed something.

Thanks again
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Thursday, August 5th, 2010 AT 6:39 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
My guess is the problem is under the dash. As far as checking for vacuum, the switch that runs everything has a supply line from the engine. It should have vacuum when the engine is running.

Let me know what you find. I really believe that is the problem.

Joe
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Thursday, August 5th, 2010 AT 11:37 PM

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