Blower fan working but no air movement - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 21 (permalink) Old 11-20-2017, 02:38 PM Thread Starter
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Blower fan working but no air movement

Hey guys,

I took the Jeep out hunting yesterday and ran into a funny problem. The last few months of cold weather driving I had no issues. The heater made sweltering heat and the fan blew air without issue. I even cycled through the various settings, floor vents etc. Part of the way there driving down the highway, the fan was blowing away, we could hear it running, but little to no air came through the vents. Hitting the brakes would make the fan change speed but no air. When we got to the area, we had to off road it a bit. As it was bouncing around through the rough trails, the air suddenly came pumping through the vents. I have read about an issue with the blend door and /or the blend door actuator. Any thoughts?
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post #2 of 21 (permalink) Old 11-20-2017, 04:27 PM
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Originally Posted by Flex View Post
Hey guys,

I took the Jeep out hunting yesterday and ran into a funny problem. The last few months of cold weather driving I had no issues. The heater made sweltering heat and the fan blew air without issue. I even cycled through the various settings, floor vents etc. Part of the way there driving down the highway, the fan was blowing away, we could hear it running, but little to no air came through the vents. Hitting the brakes would make the fan change speed but no air. When we got to the area, we had to off road it a bit. As it was bouncing around through the rough trails, the air suddenly came pumping through the vents. I have read about an issue with the blend door and /or the blend door actuator. Any thoughts?
I think that could be your problem Flex, there are a couple of parts associated with that, that commonly break and/or fail.

Here is a pretty good thread about it that has alot of details including part numbers.

Part # 68017816AB for fresh air/recirc air door part.

Part # 5143192AA actuator for heater doors.

There is also a plastic gear on the actuator/recirculation door that tends to break off or the teeth on the plastic gear actually strip.

https://www.jeepcommander.com/forums/...tays-open.html


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Last edited by Big Blue; 11-20-2017 at 04:31 PM.
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post #3 of 21 (permalink) Old 11-20-2017, 08:09 PM Thread Starter
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Thanks,

It goes in tomorrow morning for a new key fob to be programmed and then I will try to pop out the blower motor and see what I can find.
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post #4 of 21 (permalink) Old 11-21-2017, 01:39 AM
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Originally Posted by Flex View Post
Thanks,

It goes in tomorrow morning for a new key fob to be programmed and then I will try to pop out the blower motor and see what I can find.
Cool, let me know how it goes.


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post #5 of 21 (permalink) Old 11-22-2017, 05:38 PM Thread Starter
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Ok, so I pulled the fan out. It had a small amount of debris in it but works fine. The blend door is still attached and nothing inside the housing appears broken. I tried to operate the modulator. It revolves around but is not engaging the teeth of the blend door. The cog on the modulator appears intact and the teeth on the blend door are intact. Somehow it must have popped out of alignment so that the modulator can only partially engage. I looked through my digital manual and can't find instructions on how to properly align the two components. I will try to look here.
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post #6 of 21 (permalink) Old 11-22-2017, 06:30 PM Thread Starter
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Ok, I removed the modulator and the teeth are snapped off. I just ordered a new gear as it is available separate from the housing. Part number 68072190aa
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post #7 of 21 (permalink) Old 11-22-2017, 08:37 PM Thread Starter
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So after reassembling everything, I realized that the broken gear would only affect the heating systems ability to adjust where the air is being drawn from. It has no control of which outlets the air flows through. There appears to be another actuator just to the left of the glove box door as you face it. Does anybody know if it controls the flow path? I used to hear a buzzing sound coming from that vicinity once in awhile.
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post #8 of 21 (permalink) Old 11-23-2017, 12:48 AM
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Quote:
Originally Posted by Flex View Post
So after reassembling everything, I realized that the broken gear would only affect the heating systems ability to adjust where the air is being drawn from. It has no control of which outlets the air flows through. There appears to be another actuator just to the left of the glove box door as you face it. Does anybody know if it controls the flow path? I used to hear a buzzing sound coming from that vicinity once in awhile.
I don't know honestly Flex - but it seems logical that might have something to with this part number for the recirculation air door:

Part # 68017816AB for fresh air/recirc air door part.


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post #9 of 21 (permalink) Old 11-23-2017, 01:22 AM Thread Starter
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Join Date: Aug 2017
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No bud. That is the blend door housing. The blend door is not damaged and opens and closes smoothly by hand. The gear that is manipulated by the actuator has the teeth broken off, but that door determines where the air is drawn into the HVAC assembly from. The dash controls either open the doors using vacuum or electronically or perhaps both. I will pull out a spare switch and see.
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post #10 of 21 (permalink) Old 11-26-2017, 06:03 PM Thread Starter
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Join Date: Aug 2017
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Ok, so blend door gear has been replaced. I filled the back of it with epoxy so that it would be more rigid. Blend door works great now. Same issue with the air movement though. It starts off fine with everything moving and air flowing. An hour down the highway and no air through the vents. Shut the vehicle off and let it sit for awhile and it works again. So it is obviously something that stops working when it gets really hot.
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