A/C heater turns on by itself

E92GRL · 05-22-2016, 02:05 AM

So this is a fun one.

Turned my car on, after warming it up for five minutes, I get in and it's cold outside so I then my heater on... Run it for about 10 minutes before deciding I'm way too hot and turn it off. Listening to music, cruising and look down and it's on. Think to myself... I could've sworn I turned it off... So turn I turn it off. Look back down after a couple minutes and it's back on... Turn it off... 15 seconds go by and it turns it self back on. Needless to say process repeats over and over.

I have owned the car for 3+ years it's a 2007 335i
Never set automatic controls on the car to have auto climate control.

Anybody deal with this issue or have a clue what it could be?
HELP!

fareast1 · 05-22-2016, 09:44 AM

auto switch may be going bad- making electrical contact when you hit a bump or something.

elons335i · 05-22-2016, 10:09 AM

Quote:

Originally Posted by E92GRL

So this is a fun one.

Turned my car on, after warming it up for five minutes, I get in and it's cold outside so I then my heater on... Run it for about 10 minutes before deciding I'm way too hot and turn it off. Listening to music, cruising and look down and it's on. Think to myself... I could've sworn I turned it off... So turn I turn it off. Look back down after a couple minutes and it's back on... Turn it off... 15 seconds go by and it turns it self back on. Needless to say process repeats over and over.

I have owned the car for 3+ years it's a 2007 335i
Never set automatic controls on the car to have auto climate control.

Anybody deal with this issue or have a clue what it could be?
HELP!

Make sure it's not at the lowest temperature setting. If it is turn it up a few degrees.

924er · 05-22-2016, 12:00 PM

My moms 2007 e60 does that

VTECaddict · 05-22-2016, 01:11 PM

Might be to prevent the windows from fogging up.

kkasson · 05-22-2016, 01:45 PM

What exactly are you turning on and off? Are you lowering the fan speed, or turning climate control all the way off? Or something else?

If you're just lowering the fan and it's raising itself back up, it could be the blower motor resistor.

05-22-2016, 02:05 AM	#1
E92GRL @E92GRL 113 Rep 322 Posts Drives: E30 // E92 // E39-sold Join Date: Dec 2012 Location: NorCal iTrader: (0)	A/C heater turns on by itself So this is a fun one. Turned my car on, after warming it up for five minutes, I get in and it's cold outside so I then my heater on... Run it for about 10 minutes before deciding I'm way too hot and turn it off. Listening to music, cruising and look down and it's on. Think to myself... I could've sworn I turned it off... So turn I turn it off. Look back down after a couple minutes and it's back on... Turn it off... 15 seconds go by and it turns it self back on. Needless to say process repeats over and over. I have owned the car for 3+ years it's a 2007 335i Never set automatic controls on the car to have auto climate control. Anybody deal with this issue or have a clue what it could be? HELP! __________________
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05-22-2016, 09:44 AM	#2
fareast1 Second Lieutenant 41 Rep 208 Posts Drives: 2006 330I, 1996 z3, 2010 X5 Join Date: Mar 2016 Location: Northeast iTrader: (1)	auto switch may be going bad- making electrical contact when you hit a bump or something.
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05-22-2016, 12:00 PM	#4
924er Colonel 352 Rep 2,050 Posts Drives: e92 335i '10 Join Date: Feb 2014 Location: Socal iTrader: (0)	My moms 2007 e60 does that __________________ '10 e92 N54 DCI intakes, ER chargepipe, TIAL BOV, VRSF 5in FMIC, BMS Downpipes COBB e30
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05-22-2016, 01:11 PM	#5
VTECaddict Where'd my VTEC go? 481 Rep 6,067 Posts Drives: 06 330i 6MT Join Date: Mar 2009 Location: Seattle, WA iTrader: (4)	Might be to prevent the windows from fogging up. __________________ AW/Terra \| ZSP \| ZPP \| ZCW \| iDrive \| CA Mods: BC BR coilovers \| Blacklines \| M-tech rear \| dual exhaust \| M3 steering wheel \| BMW SSK \| ZHP shift knob \| High-kick CF spoiler \| NBT Retrofit M3 front control arms \| M3 rear guide rods \| Manzo rear toe and camber links \| Monroe rear shock mounts \| Varrstoen ES1 19x9.5+20 Front, 19x11+25 rear
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05-22-2016, 01:45 PM	#6
kkasson Lieutenant 187 Rep 589 Posts Drives: 07 BMW 328i, 08 BMW 528i Join Date: Jun 2015 Location: CA iTrader: (0)	What exactly are you turning on and off? Are you lowering the fan speed, or turning climate control all the way off? Or something else? If you're just lowering the fan and it's raising itself back up, it could be the blower motor resistor.
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