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Unread 11-22-2014, 10:38 PM   #1
Raist11
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HVAC - blower, selector or blockage

Fan blows at all speeds. I thought at first selector was shot but it seems to be changing between vents. Thing is, there is very little air flow coming through. When changing to the vents it seems it may still be coming at the deforst. With so little air movement it is hard to tell. Could it be some blockage? Thanks in advance for any input.

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Unread 11-22-2014, 11:18 PM   #2
Raist11
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Should have said, 2000 Tj sport 4.0L.

Reading another post, I don't hear anything when changing the selector... probably vacuum, but odd that it seems like it may be changing. Perhaps it just isn't changing enough.
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Unread 11-22-2014, 11:37 PM   #3
Knuckelhead
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Quote:
Originally Posted by Raist11 View Post
Should have said, 2000 Tj sport 4.0L.
That and a few more things should be in your profile.

Do you have the Original Equipment Manufacture (OEM) Factory Service Manual (FSM)? If not you should get one, that's the best money you'll spend on your Jeep.

Have you looked at the vacuum lines going from the intake manifold to the reservoir under the battery and going to the mode select switch on the HVAC panel?...
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Unread 11-22-2014, 11:37 PM   #4
SkeeterTZX
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check the vacuum lines under the hood. i had a bad one on my XJ that did the same thing. it defaults to defrost when there is no pull
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Unread 11-23-2014, 07:16 AM   #5
oakmckinley
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Also under the drivers kick panel by your knees there are the actuators that control the switching from vents/floor/defrost etc.
the arms are known for breaking.



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Unread 12-13-2014, 01:28 PM   #6
Raist11
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I finally found some spare time and the weather wasn't freezing cold and got to take the panel off and have a closer look. (I've gotten too old to enjoy laying on my back looking up) The actuators are moving, and seem to be moving fully. There still doesn't seem to be very much air. I'm sure I had more air flow in my old Jeep. I think at this point it's blockage, the fan speeds do increase/decrease. Maybe I'll just have to suck it up this winter, then in the summer yank out the fan and have a look. Unless I get my garage insulated before the end of winter.

Thanks for the input.

Edit: After thought... I couldn't hear it switching before. Perhaps they were stuck a bit and my tugging at them loosened them up? Or maybe just barely enough vacuum.. Great, more possibilities again. :P
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Unread 12-13-2014, 06:06 PM   #7
Shark_13
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Try removing the cowl outside below the windshield, on the passenger side is the air intake. Check for obstructions....
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Unread 12-16-2014, 05:43 PM   #8
Raist11
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Thanks, I was thinking about that, it looks good from the outside.. But of course that doesn't mean a whole lot. Glad you mentioned it, that'll be my next step.
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