AC help!! Air is cold but is blowing much slower than normal

Crosed88 · 06-20-2022, 02:45 PM

Out of nowhere my AC air pressure has almost completely stopped working? Air is still cool/cold, but only a small amount of air is coming out of the vents even when turned to full speed… I would say at full blast it's coming out like it would normally on low. I have a 19' 430i. Any ideas what could cause this?

joesid · 06-20-2022, 03:05 PM

When was the cabin filter last changed?

Crosed88 · 06-20-2022, 03:07 PM

Quote:

Originally Posted by joesid

When was the cabin filter last changed?

Probably 5-8,000 miles ago. So not sure that that's the issue. It also happened immediately; not gradually

AndrewC1989 · 06-20-2022, 03:19 PM

Sounds like the evaporator is probably freezing over. Common issue. If you google it you'll find a service bulletin (TSB 640613 I think).

Crosed88 · 06-20-2022, 03:20 PM

Quote:

Originally Posted by AndrewC1989

Sounds like the evaporator is probably freezing over. Common issue. If you google it you'll find a service bulletin (TSB 640613 I think).

Do I need to go in to fix? Or it will just defrost and be fine?

AndrewC1989 · 06-20-2022, 03:23 PM

Quote:

Originally Posted by Crosed88

Do I need to go in to fix? Or it will just defrost and be fine?

The temporary fix is to shut off the AC but keep regular air flow on for a few min. It will thaw out and work normally after that. If it happens on a regular basis then go to the dealer for a fix.

https://static.nhtsa.gov/odi/tsbs/20...47927-9999.pdf

Billfitz · 06-20-2022, 03:45 PM

Also try raising the temperature. What can happen is that the coils start to freeze over in very humid weather, so the airflow is reduced. The usual reaction is to lower the temperature, which only makes it worse. I used to work at a motel where the window ACs were undersized. On a hot and humid day we'd regularly find the thermostat turned all the way down with zero airflow, because there were two inches of ice on the coils.

06-20-2022, 02:45 PM	#1
Crosed88 Enlisted Member 8 Rep 38 Posts Drives: 2019 430i M sport Join Date: Nov 2021 Location: South Florida iTrader: (0)	AC help!! Air is cold but is blowing much slower than normal Out of nowhere my AC air pressure has almost completely stopped working? Air is still cool/cold, but only a small amount of air is coming out of the vents even when turned to full speed… I would say at full blast it's coming out like it would normally on low. I have a 19' 430i. Any ideas what could cause this?
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06-20-2022, 03:05 PM	#2
joesid Private First Class 80 Rep 180 Posts Drives: 2016 BMW 340i xDrive Join Date: Nov 2020 Location: Washington, DC iTrader: (0)	When was the cabin filter last changed?
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06-20-2022, 03:19 PM	#4
AndrewC1989 Brigadier General 10931 Rep 4,551 Posts Drives: 2015 328d xDrive Join Date: Aug 2010 Location: NoVA iTrader: (5) Garage List 2015 328d xDrive [8.90]	Sounds like the evaporator is probably freezing over. Common issue. If you google it you'll find a service bulletin (TSB 640613 I think). __________________ My Build Thread
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06-20-2022, 03:45 PM	#7
Billfitz Lieutenant General 8243 Rep 16,082 Posts Drives: '15 328iX GT Join Date: Jan 2015 Location: New Hampshire iTrader: (0)	Also try raising the temperature. What can happen is that the coils start to freeze over in very humid weather, so the airflow is reduced. The usual reaction is to lower the temperature, which only makes it worse. I used to work at a motel where the window ACs were undersized. On a hot and humid day we'd regularly find the thermostat turned all the way down with zero airflow, because there were two inches of ice on the coils.
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