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  #1  
Old 09-08-2019, 02:46 PM
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Bill-SD Bill-SD is offline
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A/C fan issue

A couple weeks ago we drove the F30 from San Diego to Santa Barbara. It was pretty hot out and in LA stop and go traffic the AC stopped blowing out the vents. You could hear the fan running full speed but no air was coming out. Then it felt like warm air was starting to trickle out. We got off the freeway and turn the car off for around 10 minutes. When we started the car again the AC was fine for the rest of the trip, and is still working fine. Any ideas on what would have caused this?
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Old 09-08-2019, 05:25 PM
carlson2005 carlson2005 is offline
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I've had this happen twice with my 2015 328i, and it seems to be related to high humidity with high temp and long periods of driving. I assume it is the evaporator icing up and stopping air flow, since the solution is to just shut the engine down for a while and let it go back to normal operation (ice apparently melts).

I changed my cabin air filter, just in case, since poor evaporator air flow or dirt on the evaporator can cause this problem. I'll have to wait and see if it happens again.

I did a Google search and found a few similar complaints for BMW, but it did seem to be very common or frequent problem.

Bruce
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Old 09-08-2019, 05:31 PM
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Doug Huffman Doug Huffman is offline
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If the BMW IHKA HVAC is functioning properly, one of the three instances of the compressor-evaporator not being always fully loaded is unloading / shutdown at ~3C out of the evaporator. The other two are for engine power control at idle and wide open throttle.
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Old 09-09-2019, 04:48 PM
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Thanks for the info. I wasn't sure what to google for, but with the info in these replies, I was able to search and see that a lot of folks have had the same thing happen to them.

I'm going to try replacing my cabin filter and see if that helps. Silly question...which direction should the filter arrow point? I've seen a lot of conflicting info on that.
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Old 09-09-2019, 05:01 PM
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Doug Huffman Doug Huffman is offline
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Scepticism and Animal Faith (1923)
Scepticism is the chastity of the intellect, and it is shameful to surrender it too soon or to the first comer: there is nobility in preserving it coolly and proudly through long youth, until at last, in the ripeness of instinct and discretion, it can be safely exchanged for fidelity and happiness.
(The Works of George Santayana p. 65)

Eschew eristical argumentation. I am responsible for what I write, not for your understanding of it.
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Old 09-09-2019, 06:06 PM
namelessman namelessman is offline
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Quote:
Originally Posted by Bill-SD View Post
which direction should the filter arrow point?
2:20 says points arrow to front of car.

Also it can be confirmed by turning on fan(and feeling the flow) while the filter is uninstalled.


Last edited by namelessman; 09-09-2019 at 06:13 PM.
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Old 09-10-2019, 09:19 PM
eddymerckx3 eddymerckx3 is offline
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Changing the cabin microfilmer will do nothing.

There are several known TSBs on this issue. Here are a few threads that could be found using search tool:

https://www.bimmerfest.com/forums/sh...d.php?t=847107

https://f30.bimmerpost.com/forums/sh...d.php?t=998638

https://f30.bimmerpost.com/forums/sh....php?t=1633831

https://www.bimmerfest.com/forums/sh...d.php?t=929785

https://f30.bimmerpost.com/forums/sh....php?t=1285816
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