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HVAC Vents Dont BLow

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Old Apr 8, 2011 | 10:25 AM
  #1  
Screwd up 6's Avatar
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From: Spring, TX
Year: 1994
Model: Cherokee
Engine: 4.0
Default HVAC Vents Dont BLow

When I turn my jeep to "vent" or "a/c" or anything...you can hear the blower kick on. If you change the speeds from lo-hi you can hear the blower get louder. But if you put your hands infront of any of the vents there is no air coming out. A new born baby fart has more air pressure than my vents.

I do have the a/c compressor disconnected from the previous owner, but i would think it should still blow heat and outside air thru the vents.

Anyone know where to start trouble shooting?

Thanks in advance
Screwd up 6
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Old Apr 8, 2011 | 08:05 PM
  #2  
Copytech's Avatar
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From: Ironton Ohio
Year: 1994
Model: Cherokee
Engine: 4.0
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the air control doors inside the heater box are controlled by vacuum. So you have a bad vacuum line or leak, stuck door, or a bad vacuum actuator.
Attached Thumbnails HVAC Vents Dont BLow-20110319163955413_0001.jpg  

Last edited by Copytech; Apr 8, 2011 at 08:07 PM.
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Old Apr 8, 2011 | 08:08 PM
  #3  
E-Rok's Avatar
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From: Everett, WA
Year: 1996
Model: Grand Cherokee
Engine: 5.2L
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yep, check you vac lines. id look at the vac ball first, see if either hose popped off.
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Old Apr 21, 2011 | 10:16 AM
  #4  
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From: Spring, TX
Year: 1994
Model: Cherokee
Engine: 4.0
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Found a pinched line on the firewall
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Old Apr 21, 2011 | 10:30 AM
  #5  
freegdr's Avatar
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From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
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the default mode of your vents will be the defroster it should be blowing out of them even with out vacuum
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