Ever have your AC just stop working?

S6F · 06-29-2019, 02:28 PM

Happened twice in my ‘19 540iX in the first 750 miles. AC is working perfectly, then for no apparent reason, it starts blowing warm air! A minute later and it’s fine again. A little unsettling especially on a super hot day like today.

SteveinArizona · 06-29-2019, 02:40 PM

not me. Thankfully. 100 degrees today.

claykin · 06-29-2019, 03:48 PM

Quote:

Originally Posted by stevefoster

Happened twice in my ‘19 540iX in the first 750 miles. AC is working perfectly, then for no apparent reason, it starts blowing warm air! A minute later and it’s fine again. A little unsettling especially on a super hot day like today.

While you're driving? If stopped and A. S. S. is enabled the air will blow warm when the engine stops.

S6F · 06-29-2019, 04:30 PM

Thanks for the replies. Both times it happened were when the car way moving along steadily on the road.

VirtualGuitars · 06-29-2019, 06:49 PM

Quote:

Originally Posted by stevefoster

Thanks for the replies. Both times it happened were when the car way moving along steadily on the road.

It's probably the HVAC sensor. That's a common issue on BMWs and hot weather. It happened on my X6 a few times.

AP · 06-29-2019, 10:51 PM

Were you in eco pro mode?
Eco pro can try and save fuel by using the a/c less. In ecopro individual mode you can configure it not to do that if you wish.

530iDriver · 06-30-2019, 06:46 AM

Quote:

Originally Posted by stevefoster

Happened twice in my ‘19 540iX in the first 750 miles. AC is working perfectly, then for no apparent reason, it starts blowing warm air! A minute later and it’s fine again. A little unsettling especially on a super hot day like today.

Get it looked at for possible Freon leaks. This week I was in Orlando, FL with temps hovering above 100F and the AC never quit.

steve090619 · 06-30-2019, 08:08 AM

Quote:

Originally Posted by stevefoster

Happened twice in my ‘19 540iX in the first 750 miles. AC is working perfectly, then for no apparent reason, it starts blowing warm air! A minute later and it’s fine again. A little unsettling especially on a super hot day like today.

Quote:

Originally Posted by stevefoster

Happened twice in my '19 540iX in the first 750 miles. AC is working perfectly, then for no apparent reason, it starts blowing warm air! A minute later and it's fine again. A little unsettling especially on a super hot day like today.

My car would pump hot air out of foot vent while AC was on. Fix for me is I keep hidden stratification adjustment in middle and don't touch. For some reason this fixed the problem.

VirtualGuitars · 06-30-2019, 01:23 PM

Again, I guarantee you it's the HVAC sensor. I have a friend that works at BMW of Austin that says this happens all of the time in Texas heat. The sensor can misread the temperature.

ztx84 · 06-30-2019, 01:42 PM

This has happened to me a few times - AC working and blowing cold air one minute, then blowing hot air the next. Mine corrects itself almost immediately though so I am not too worried.

TXSchnee · 06-30-2019, 04:04 PM

They are designed to bring in fresh outside air periodically, which causes it to blow hot. My G01 does this as well, you can turn it off in iDrive under climate settings, since I've done that, no more hot air (I live in Central TX, so this is important).

hiranrushi · 04-12-2023, 10:35 AM

My 2017 530i (G30) has the same issue. Intermittently the AC stops working. Even MAX AC doesn't work. Did anyone find a fix for this? Did anyone replace the HVAC sensor and fixed it?

hiranrushi · 04-12-2023, 10:38 AM

Quote:

Originally Posted by S6F

Happened twice in my ‘19 540iX in the first 750 miles. AC is working perfectly, then for no apparent reason, it starts blowing warm air! A minute later and it’s fine again. A little unsettling especially on a super hot day like today.

Did you get it fixed? What was wrong? My G30 530i has the same issue.

m@rco · 04-23-2023, 07:27 PM

A bit off topic but I have a similar experience… the vents in the rear passengers (consistently) blow way too cold air into the car ONLY WHEN it is very cold outside. During the winter, with temps around 0F, the rear passengers were freezing and had to close the vents. Anyone experience with that?

hiranrushi · 06-04-2023, 03:07 PM

Quote:

Originally Posted by ztx84

This has happened to me a few times - AC working and blowing cold air one minute, then blowing hot air the next. Mine corrects itself almost immediately though so I am not too worried.

Did you get it fixed? What was wrong? My G30 530i has the same issue.

ztx84 · 06-05-2023, 08:49 AM

Quote:

Originally Posted by hiranrushi

Did you get it fixed? What was wrong? My G30 530i has the same issue.

Never took it back to get looked at as it was only for literally a few seconds then went back to ice cold again. Maybe it was something in the system cycling or something like that... That's what I put it down to.

ab1752 · 06-05-2023, 10:10 PM

On my 2018 m550i, the ac performed poorly from the word go. I finally asked them to check it this spring and they said it was performing within spec. I just traded that one in for a new m550i and the ac is markedly better on all accounts. However twice when it was relatively warm, I had no avc at all for 10 minute's time. Otherwise, it's blasting cold so we will watch and see if this is isolated or not.

06-29-2019, 02:28 PM	#1
S6F First Lieutenant 197 Rep 374 Posts Drives: '19 540ixMsport Join Date: Aug 2010 Location: Central NJ iTrader: (1)	Ever have your AC just stop working? Happened twice in my ‘19 540iX in the first 750 miles. AC is working perfectly, then for no apparent reason, it starts blowing warm air! A minute later and it’s fine again. A little unsettling especially on a super hot day like today.
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06-29-2019, 02:40 PM	#2
SteveinArizona Brigadier General 3014 Rep 4,208 Posts Drives: BMW 530e Join Date: Jul 2016 Location: Greater Phoenix iTrader: (0)	not me. Thankfully. 100 degrees today.
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06-29-2019, 04:30 PM	#4
S6F First Lieutenant 197 Rep 374 Posts Drives: '19 540ixMsport Join Date: Aug 2010 Location: Central NJ iTrader: (1)	Thanks for the replies. Both times it happened were when the car way moving along steadily on the road.
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06-29-2019, 10:51 PM	#6
AP Major General 3366 Rep 5,643 Posts Drives: G30 M550 Join Date: Apr 2011 Location: UK iTrader: (0)	Were you in eco pro mode? Eco pro can try and save fuel by using the a/c less. In ecopro individual mode you can configure it not to do that if you wish.
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06-30-2019, 01:23 PM	#9
VirtualGuitars Major General 7954 Rep 5,813 Posts Drives: 2024 BMW XM Label Join Date: Jan 2019 Location: Houston, TX iTrader: (0) Garage List 2024 BMW XM Label [10.00]	Again, I guarantee you it's the HVAC sensor. I have a friend that works at BMW of Austin that says this happens all of the time in Texas heat. The sensor can misread the temperature.
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06-30-2019, 01:42 PM	#10
ztx84 First Lieutenant 214 Rep 315 Posts Drives: 2022 M4 Competition Xdrive Join Date: Jan 2018 Location: Devon, UK iTrader: (0)	This has happened to me a few times - AC working and blowing cold air one minute, then blowing hot air the next. Mine corrects itself almost immediately though so I am not too worried.
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06-30-2019, 04:04 PM	#11
TXSchnee Major 1493 Rep 1,516 Posts Drives: 2024 XM Join Date: Nov 2018 Location: Texas iTrader: (0)	They are designed to bring in fresh outside air periodically, which causes it to blow hot. My G01 does this as well, you can turn it off in iDrive under climate settings, since I've done that, no more hot air (I live in Central TX, so this is important). __________________ 2024 BMW XM 2023 Porsche Taycan Cross Turismo 4S 2023 BMW iX M60 (sold) 2020 Porsche Cayenne E Hybrid (sold) 2018 X3 M40i (sold)
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04-12-2023, 10:35 AM	#12
hiranrushi New Member 3 Rep 7 Posts Drives: BMW 530i Join Date: Mar 2021 Location: Toronto iTrader: (0)	My 2017 530i (G30) has the same issue. Intermittently the AC stops working. Even MAX AC doesn't work. Did anyone find a fix for this? Did anyone replace the HVAC sensor and fixed it?
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04-23-2023, 07:27 PM	#14
m@rco First Lieutenant 27 Rep 322 Posts Drives: '20 540i; '07 328i; '03 R1150R Join Date: Dec 2009 Location: Boston iTrader: (0)	A bit off topic but I have a similar experience… the vents in the rear passengers (consistently) blow way too cold air into the car ONLY WHEN it is very cold outside. During the winter, with temps around 0F, the rear passengers were freezing and had to close the vents. Anyone experience with that?
	Appreciate 0 Quote

06-05-2023, 10:10 PM	#17
ab1752 Private 59 Rep 74 Posts Drives: 2022 BMW M550i Join Date: Sep 2022 Location: GWN iTrader: (0)	On my 2018 m550i, the ac performed poorly from the word go. I finally asked them to check it this spring and they said it was performing within spec. I just traded that one in for a new m550i and the ac is markedly better on all accounts. However twice when it was relatively warm, I had no avc at all for 10 minute's time. Otherwise, it's blasting cold so we will watch and see if this is isolated or not.
	Appreciate 0 Quote