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post #1 of 7 Old 06-02-2011, 12:14 PM Thread Starter
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Issue with my AC...

My ac seems to only want to blow out of the defrost. Every once in a while it will blow correctly, but its likes one in ten times. It makes a noise kinda like a clatter or a card on a bike spoke kinda. Got a video link ill add here in a bit.

2008 F250 King Ranch 4x4
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post #2 of 7 Old 06-02-2011, 12:36 PM
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check vaccuum hose lines. may have a dry rotted one

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post #3 of 7 Old 06-02-2011, 12:39 PM
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Yep, vacuum line. Pull out the glove box, there is a TSB for the one that could be warped around and damaged

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post #4 of 7 Old 06-02-2011, 01:36 PM Thread Starter
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Is there a write up around here for it? I dont see how a hole in a vacuum line can make chatter/Chopping sound and not a whistle?

2008 F250 King Ranch 4x4
5' Flo-Pro, GearHeads Tune, Coolant Filter

Sold: 2005 F250 King Ranch 4x4
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post #5 of 7 Old 06-02-2011, 01:40 PM
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Originally Posted by justinp95 View Post
Is there a write up around here for it? I dont see how a hole in a vacuum line can make chatter/Chopping sound and not a whistle?
http://www.intellidog.com/dieselmann/60bulletin.htm


2005/06 A/C or Ventilation Control Problems:
Trucks built between 9-15-04 to 6-8-05 may blow air out of the defrost vents with the mode selector in other positions. The vacuum pump may also run excessivly. Lower the glove box and inspect the vacuum lines to see if they are wraped around the panel/floor door actuator rod. If the hoses are wraped around the rod, inspect for damage to the hoses. If the hoses cannot be repaired, replace them with part number 5C3Z-19D699-AA for automatic temp control or 5C3Z-19D699-BA for manual climate control.
TSB 05-14-9.

Vacuum Pump Inop or Ventilation System Deverts to, or Only Blows Through, Defrost Vents:
If the vents devert to the defrost mode, this is usually due to a leak in the vacuum system. Typically if the problem is in the automatic hub system, this will only occur when 4X4 is selected. If it occurs on in a specifc ventilation mode, the vacuum servos associated with that selection would be suspect. If the ventilation system stays on defrost at all times, a leak in the system at the vacuum pump, or the vacuum pump itself may be at fault. For vacuum pumps that are inoperative or continuously running, replace with P/N 4C3Z-2A451-AB. Broadcast Message 1244, 1575, 3278; TSB #04-16-08

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2011 K1500 Silverado Z71 5.3L Vortec
2004 F250 Super Crew FX4 Powerstroke
1997 F250 Super Cab 4x4 Powerstroke
2004 K1500 Silverado Z71 5.3L Vortec
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1998 K2500 Silverado 5.7L Vortec

Last edited by SixStringMadness; 06-02-2011 at 01:45 PM.
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post #6 of 7 Old 06-02-2011, 01:53 PM Thread Starter
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Thanks, Heres my video. This is when it is very quiet. Usually it is much louder.


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Sold: 2005 F250 King Ranch 4x4
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post #7 of 7 Old 06-02-2011, 02:38 PM
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