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Unread 12-30-2015, 10:43 PM   #1
wassy
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2000 TJ Wrangler 
 
Join Date: Nov 2006
Location: Colorado
Posts: 142
No air coming through any vents when cold outside

Hi all, so I've been having this issue for a while on my 2000 wrangler, I'm not getting any airflow coming out of any of my vents only when it's teens and below outside otherwise the whole system works flawlessly. I can see and hear the fan spinning at all different speeds, I can see the actuators opening and closing, and I can feel heat coming through the vents. What could it be??? please any suggestions? I'm sick of being cold!! haha

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Unread 12-30-2015, 10:58 PM   #2
MoFarmBoy
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2006 TJ Wrangler 
 
Join Date: Aug 2013
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I'm a bit confused by your description of symptoms. You say no air, but you feel tepid heat coming out of the vents?

If your engine temperature is normal, and the fan and actuator are working properly, I would suspect an obstructed heater core. At operating temperature, grasp the core input and output hoses. If there is a marked difference in warmth, coolant is not circulating properly.

It may be time to flush that core.
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Unread 12-30-2015, 11:24 PM   #3
btn
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Sounds like the blower motor or resistor is dying: Not turning the proper RPMs to get the proper flowrate. Or maybe the air intake under the hood grill is obstructed.
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Unread 12-31-2015, 01:35 AM   #4
Jeepster83
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2003 TJ Wrangler 
 
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When you change to mode (face, feet, etc.) can you hear the doors moving? If you can feel temperature change when you move the hot/cold dial then the blend door(s) works. But no flow from the vents would be a mode door problem. You also say the fan works fine at any speed?
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Unread 12-31-2015, 06:34 AM   #5
wassy
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Yes I can feel tepid heat coming from vents, and I can hear the fan spinning at different rpms when selected. The weird thing is that it only does this when it's really cold outside when it's warmer it works fine.
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Unread 12-31-2015, 10:55 AM   #6
98TJSE
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1998 TJ Wrangler 
 
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well when its warmer... it dosent need to heat up air as much, when colder it takes more heat to heat up that colder air... kind alike summer your engine hits operating temp fast.. in -40 takes a few minutes more lol , so it sounds as heatercore is blocked up, can try reverse flushing, then last replaceing the heatercore..
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Unread 12-31-2015, 02:09 PM   #7
wassy
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How that would affect the air speed though?
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Unread 12-31-2015, 02:15 PM   #8
98TJSE
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1998 TJ Wrangler 
 
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well .. your sayign warm air vs lack of air.. you got 2 different issues your saying.. is it low air or warm(not hot) as tepid means


you were asked if fan works at any speed and you responded YES.... this is were your confusing me now..
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Unread 12-31-2015, 02:42 PM   #9
wassy
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Haha yes the fan works at all speeds but the air doesn't come through any vents, the heat does work because I can feel warm air through the vents it just doesnt blow out.
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Unread 12-31-2015, 02:50 PM   #10
98TJSE
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1998 TJ Wrangler 
 
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ah okay

you got AC? if so maybe its low and freezing up in lower temps? if equipped maybe remove compressor solenoid or fuse? from distribution box? since you say warmer weather it all works fine..
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Unread 12-31-2015, 02:53 PM   #11
wassy
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I'll go try that, yeah my ac lines get frosty I don't know why...
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Unread 12-31-2015, 03:02 PM   #12
wassy
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Well that didn't work maybe because lines are still frozen?
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Unread 12-31-2015, 03:20 PM   #13
98TJSE
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1998 TJ Wrangler 
 
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possible.. if it freezes up it restricts airflow unplug and leave off....
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Unread 12-31-2015, 07:56 PM   #14
wassy
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You sir are a genius, I just went for a drive with it unplugged to thaw it out and my heater was blowing full blast! thank you for your help.
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Unread 12-31-2015, 10:03 PM   #15
98TJSE
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1998 TJ Wrangler 
 
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yea so it seems your ac is low on refrigerant and freezing up , so might wanna get that checked or just leave it disabled for now....
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