A/C blows, no air out vents

[Texast224]

Could be a bad bearing or connection on the blower...
I used to have to kick/tap/whack my blower to get it to work from time to time. Replaced the blower motor and no more issue with air flow.

Was looking at YouTube videos, looks easy enough.

But I don't see how the blower motor by itself could be responsible for my issue, the motor blows fine, the air out of the vent slowly goes from full blast to almost nothing. Looks like with the above mentioned the motor either blows or it doesn't, and I should be able to hear the difference, which I don't.

Almost thinking actuator is slowly closing the door blocking off airflow. It sounds like the blower is blowing air against something, the way the sound changed, like putting your hand in front of a hair dryer or something....

Buy what I don't get is why it is not just changing to some other vent like defrost?

How many doors and actuators are there? Is there an actuator responsible of air flow being on and off and then another one for what vent the air goes to? It is almost like airflow is getting cut off right at the mouth of the blower.

Happened again last night. Was blowing fine, then about half, then about 5%, all gradual, not a step function change, like a door was slowly closing. Then I turned it off for 5 minutes. Back inn flow was about 50%, then a step function change to 100%?????

I guess I'm going to have to start replacing stuff until I find the problem.

I need to find a schematic of the system.. Anyone?

 

[TigerEyz3]

Yep, I bought my blower motor at a local parts house (can't remember if it was O'Reilly's or Advance).

Your situation could also be a bad/burnt ground at the connector (in the dash behind the AC/fan controls)... When it (connector) gets warm, the connection gets looser causing less current flow, which causes the blower (or actuator) to slow (or gradually close). I'm just guessing, but it's possible.

 

[Texast224]

So when my issues starts, I can change vent to defrost and I can hear the airflow in the dash getting rerouted, or the intensity of the blowing sound lessens to about 30%, same as normal when the actuator kicks in to direct flow to defrost. But I still don't get airflow from the vents on top of the dash.

Same for the floor - I can hear the difference in airflow, as in the actuator is directing blowing air a different direction, but still air only dribbles out if the floor vent.

Is that a blower motor problem possibly? Can the 'fan' on the motor not engage and thus not spin as fast as it is supposed to? If that is the case, why does it sound like a leaf blower going off under the hush plate?

Anyone have a schematic of this system, I'm real curious where else the problem may lie.

It is almost like something in the system is blocking airflow regardless of where it is going.

Guess I'm going to replace the blower motor at this point an see what happens. Not thinking actuator at this point.

---------- Post added at 08:02 AM ---------- Previous post was at 08:01 AM ----------

I moved this to an appropriate section , as for your issue , are you sure that the air is not just being redirected? if thats the case it may be a bad door .I know mine currently has a issue where no matter what selection I'm on some air will always flow out of the defroster

Okay, seems like I have some airflow from the defrost vents too when setting is on 'normal'.

---------- Post added at 08:05 AM ---------- Previous post was at 08:02 AM ----------

Yep, I bought my blower motor at a local parts house (can't remember if it was O'Reilly's or Advance).

Your situation could also be a bad/burnt ground at the connector (in the dash behind the AC/fan controls)... When it (connector) gets warm, the connection gets looser causing less current flow, which causes the blower (or actuator) to slow (or gradually close). I'm just guessing, but it's possible.

Thanks for the tip. That sounds quite possible. But do you think the sound from the blower motor would change? Meaning it would sound like it is slowin down? Almost sounds like it working overtime, like putting your hand infront of a hair dryer.

 

[Texast224]

After more research, I believe this is my problem. We will see.

 

[Vigh_J]

Im having a very similar issue.. sub'd

 

[Texast224]

Pulled the glove box to get to it. Sure not much room.



Blowing cold now, full force. Will have to see when it gets hot. Next thing to get replaced is blower motor but supposedly the resistor is the problem 99% of the time (according to guy on YouTube...). Guess it gets too hot and affects performance of the motor...

Will give any update after next longer trip to see if it holds up.

 

[Texast224]

Transitioning nicely between blower speeds and vent direction, better than before. Although smelling a little burning smell? Maybe the new resistor is heating up and burning off some packaging oil or something??

---------- Post added at 06:26 PM ---------- Previous post was at 06:24 PM ----------

YouTube video

http://m.youtube.com/watch?v=gj4hw-HR3n4

 

[Texast224]

The more I think about this the more it seems like a mode door actuator, even though 3/4 agree that it is the resistor or blower motor. Only thing that makes sense to me. It is probably failing, and falls back to some position that is blowing air in all directions / vents and obstructing flow. Resistor going to control high low blower motor speeds, not obstruct flow. Although the "getting hot" aspect would make sense with the latency of it.

Unless it is possible that the door that recirculates air in the cabin versus pulls it from outside is failing and obstructing flow. Don't think it is temp door.

 

[SunlitComet]

The vent output control motor will not default mechanically. It will only move where the control head tells it to. When this happens make sure your a/c compressor is on and see if it stops cycling when the air output changes while the blower is still running. If so then your fan switch is the issue. It does more then just turn the blower speeds up or down.

 

[Texast224]

The vent output control motor will not default mechanically. It will only move where the control head tells it to. When this happens make sure your a/c compressor is on and see if it stops cycling when the air output changes while the blower is still running. If so then your fan switch is the issue. It does more then just turn the blower speeds up or down.

Thanks Sunlit. I believe the compressor is still running as the little air that is coming out of the vent is still cold.

When you say fan switch, are you referring to the resistor?

How much air flow is normal to get out of the floor vents when you have it selected for dash vents.