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      06-15-2014, 08:55 PM   #1
Austinformedude
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A/C evaporator freezing over?!?

Now that it is warm out and I am running the A/C all the time, I am running into an issue on my 2013 328. Around town, everything is fine but after several hours on the freeway, the blower is working but very little air is coming out of the vents. You can hear the blower working, but almost nothing coming out of any vents causing the whole car to heat up. If I turn off the car and let it thaw out everything comes back to normal. Lots of water coming from the evap case when parked. I strongly suspect the evaporator is freezing over. There is supposed to be software and sensors to prevent this. Anyone else having this issue or found a solution? Taking a road trip with the F30 is not much fun when having to stop all the time to thaw out the evaporator.
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      06-15-2014, 10:04 PM   #2
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Check the refrigerant pressure it might be low on gas.
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      06-15-2014, 10:20 PM   #3
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Check the refrigerant pressure and check out the cabin air filter
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      06-16-2014, 07:38 AM   #4
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Normally this is because the flow of air is blocked, could be due to a dirty evaporator? Or filter. Or anywhere the air flow might be blocked.
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      06-16-2014, 07:44 PM   #5
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Thanks for the help guys. I know my cabin filter is clean, so next step will be to bring it in and check the system charge. I did drive 4 hours today in 98 degree heat with no issues. Today I left the fan speed up and turned the temp warmer. It seems to only ice over with low fan speeds.
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      06-17-2014, 01:40 PM   #6
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I strongly suggest you take it to your dealership. I do a bit of work with building A/Cs and icing over is usually a sign of a fault (or a sign that the system isn't powerful enough, but I think we can discount that).

Worse, if an A/C ices up that in itself can cause or exacerbate faults/coolant leaks. And if there isn't enough coolant in the system, the compressor will be working overtime and could burn out. You don't want that to happen out of warranty!
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      07-16-2014, 11:56 AM   #7
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Anyone knows if F3* still requires complete dashboard removal to replace AC evaporator and/or blower? This is one of the craziest repair on E39, E46(and many other cars as well) for $3k+(a 2-day job!!!), just curious if BMW engineers finally address this.
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      07-16-2014, 08:45 PM   #8
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I checked the gas, and pressures. Everything was fine. I found that by leaving the fan speed low AND the temp low (75 or lower) the evaporator will freeze up in about 5 hours with outside temps over 90F. I don't normally take trips that long though. I think what is happening is with the low air flow, the icing isn't getting knocked off the evaporator. Now I just run the fan speeds higher and no more problems. Still, I would rather have a lower volume of colder air versus a higher volume of slightly warmer air, but that is just my preference.
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      07-17-2014, 12:24 AM   #9
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I actually ran into the same exact problem! During the 4th of July weekend, I drove from NYC to DC and about 2 hours in, my a/c stopped working. I had it on the same setting as well (low temp and low fan speed). The blower still made a loud noise when I turn up the fan but no cold air came out until I turned off the a/c for a while.

I took it to a dealership in VA over the weekend since I didn't want to drive back up with no a/c (I had no idea that it was due to a frozen evaporator at the time). The rep and the BMW technician told me they charged the battery but could not find out what is wrong either and that if it happens again, BMW will replace the blowing motor for me.


Anyways, supposedly there is a BMW service bulletin for that frozen evaporator. I PM'ed someone to see if they can get it for me. If I get it, I'll send a copy to you too.

Quote:
Originally Posted by Austinformedude View Post
I checked the gas, and pressures. Everything was fine. I found that by leaving the fan speed low AND the temp low (75 or lower) the evaporator will freeze up in about 5 hours with outside temps over 90F. I don't normally take trips that long though. I think what is happening is with the low air flow, the icing isn't getting knocked off the evaporator. Now I just run the fan speeds higher and no more problems. Still, I would rather have a lower volume of colder air versus a higher volume of slightly warmer air, but that is just my preference.
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      07-17-2014, 11:25 AM   #10
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Quote:
Originally Posted by avatar220 View Post
The rep and the BMW technician told me they charged the battery but could not find out what is wrong either and that if it happens again, BMW will replace the blowing motor for me.

Anyways, supposedly there is a BMW service bulletin for that frozen evaporator. I PM'ed someone to see if they can get it for me. If I get it, I'll send a copy to you too.
Please post SIB if available. It looks like F3* design allows access to the AC/heater blower from a panel under the glove box, what a relief!
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