Fan only works on lowest temp

Powerzone · 01-17-2015, 04:56 PM

My fan blows fine when set to the lowest temperature but when I turn the heat up the fan dies off and just stops. Does anyone know what is going on with my car?

galahad05 · 01-17-2015, 05:02 PM

The first to check for is: are you seeing similar things with, say, your seat heaters?
If yes, then you could have a dying battery. Surprising that you didn't get a warning/code though (if this is the problem).

Powerzone · 01-17-2015, 11:03 PM

The seat heaters are working good. the top vents still work. When I turn it to 16* it works which is the coldest setting and when I turn it up the fans don't blow. I heard a ticking sound a couple of days ago if that helps.

galahad05 · 01-17-2015, 11:16 PM

Okay, problem isn't the battery then.

Can you get access to or do you have a BMW-specific code reader? The onboard computer is an excellent diagnosis machine.
Also double-check your fuses. I'm not familiar with BMW's heater electrical controls, so I don't know if they have separate power buses (i.e. fuses) for low and high heat modes.

Just an idea--I'm fishin' here.

Powerzone · 01-17-2015, 11:30 PM

Ok thanks I'll check the fuses tomorrow morning as it's pouring right now. I don't have a bmw specific scanner. I'm hoping it's the fuse. I'll keep ya updated.

3s4u2 · 01-17-2015, 11:33 PM

I would start with checking your fuses...

KeepRidingDirty · 01-18-2015, 09:56 AM

I just had this problem. It was the battery. Apparently the car starts shutting off non essential items starting with the blower. Does the heat work full on when you press defrost? If it does its the battery, the car can't turn off the defrost because it's a safety issue. I'd try defrost if it works charge the battery and see if the car then allows the use of the blower fan properly. How old is the battery? It could also be your FSU which controls the blower speed.

Powerzone · 01-18-2015, 11:04 AM

It's just the center left and right vents that don't blow when I set the temperature to any higher than 16*. The top vents and defrost etc blow fine. The blower speed works when set on the lowest temperature. I'll check the fuses but not sure which fuse it is.

Ok so fuse is ok..I just realized when I turn on max heat on the drivers side no air blows, anything lower air blows.

KeepRidingDirty · 01-18-2015, 01:26 PM

Quote:

Originally Posted by Powerzone

It's just the center left and right vents that don't blow when I set the temperature to any higher than 16*. The top vents and defrost etc blow fine. The blower speed works when set on the lowest temperature. I'll check the fuses but not sure which fuse it is.

Ok so fuse is ok..I just realized when I turn on max heat on the drivers side no air blows, anything lower air blows.

Weird, could be the FSU/blower resistor, a fuse or the actual control unit. Other than that not sure what else it could be. Did you check the battery voltage? Dying battery has been known to cause all sorts of havoc.

Powerzone · 01-18-2015, 06:58 PM

I'll keep an eye out on it untill my next trip to the Indy mechanic I'll have them deal with it much easier. I appreciate all your help. Thanks.

01-17-2015, 04:56 PM	#1
Powerzone New Member 0 Rep 19 Posts Drives: 2007 335i Join Date: May 2013 Location: canada iTrader: (0)	Fan only works on lowest temp My fan blows fine when set to the lowest temperature but when I turn the heat up the fan dies off and just stops. Does anyone know what is going on with my car?
	Appreciate 0 Tweet Quote

01-17-2015, 05:02 PM	#2
galahad05 Brigadier General 158 Rep 3,158 Posts Drives: '07 335i e90 Join Date: Mar 2008 Location: Long Island NY iTrader: (0)	The first to check for is: are you seeing similar things with, say, your seat heaters? If yes, then you could have a dying battery. Surprising that you didn't get a warning/code though (if this is the problem). __________________ Always do right. This will gratify some people and astonish the rest. --Mark Twain
	Appreciate 0 Quote

01-17-2015, 11:03 PM	#3
Powerzone New Member 0 Rep 19 Posts Drives: 2007 335i Join Date: May 2013 Location: canada iTrader: (0)	The seat heaters are working good. the top vents still work. When I turn it to 16* it works which is the coldest setting and when I turn it up the fans don't blow. I heard a ticking sound a couple of days ago if that helps.
	Appreciate 0 Quote

01-17-2015, 11:16 PM	#4
galahad05 Brigadier General 158 Rep 3,158 Posts Drives: '07 335i e90 Join Date: Mar 2008 Location: Long Island NY iTrader: (0)	Okay, problem isn't the battery then. Can you get access to or do you have a BMW-specific code reader? The onboard computer is an excellent diagnosis machine. Also double-check your fuses. I'm not familiar with BMW's heater electrical controls, so I don't know if they have separate power buses (i.e. fuses) for low and high heat modes. Just an idea--I'm fishin' here. __________________ Always do right. This will gratify some people and astonish the rest. --Mark Twain
	Appreciate 0 Quote

01-17-2015, 11:30 PM	#5
Powerzone New Member 0 Rep 19 Posts Drives: 2007 335i Join Date: May 2013 Location: canada iTrader: (0)	Ok thanks I'll check the fuses tomorrow morning as it's pouring right now. I don't have a bmw specific scanner. I'm hoping it's the fuse. I'll keep ya updated.
	Appreciate 0 Quote

01-17-2015, 11:33 PM	#6
3s4u2 Beamer Mantic 82 Rep 1,191 Posts Drives: 2006 325i Prem Join Date: Apr 2008 Location: Texas iTrader: (0)	I would start with checking your fuses... __________________ 2006 325i 2006 M5 2008 X5 4.8i 2014 X5 50i M-Pkg
	Appreciate 0 Quote

01-18-2015, 09:56 AM	#7
KeepRidingDirty Professional Monkey Trainer 65 Rep 423 Posts Drives: 2007 BMW 335xi Join Date: Aug 2014 Location: Ottawa, On iTrader: (1)	I just had this problem. It was the battery. Apparently the car starts shutting off non essential items starting with the blower. Does the heat work full on when you press defrost? If it does its the battery, the car can't turn off the defrost because it's a safety issue. I'd try defrost if it works charge the battery and see if the car then allows the use of the blower fan properly. How old is the battery? It could also be your FSU which controls the blower speed. __________________ JB4 G5 ISO / ER Charge Pipe and Tial BOV / Wagner FMIC / CYBA Tips & Air Scoops / AFE DCI / BMW PE Exhaust Mod / M3 Rep Bumper / Dynavin E9x
	Appreciate 0 Quote

01-18-2015, 11:04 AM	#8
Powerzone New Member 0 Rep 19 Posts Drives: 2007 335i Join Date: May 2013 Location: canada iTrader: (0)	It's just the center left and right vents that don't blow when I set the temperature to any higher than 16. The top vents and defrost etc blow fine. The blower speed works when set on the lowest temperature. I'll check the fuses but not sure which fuse it is. Ok so fuse is ok..I just realized when I turn on max heat on the drivers side no air blows, anything lower air blows. Last edited by Powerzone; 01-18-2015 at 11:44 AM..*
	Appreciate 0 Quote

01-18-2015, 06:58 PM	#10
Powerzone New Member 0 Rep 19 Posts Drives: 2007 335i Join Date: May 2013 Location: canada iTrader: (0)	I'll keep an eye out on it untill my next trip to the Indy mechanic I'll have them deal with it much easier. I appreciate all your help. Thanks.
	Appreciate 0 Quote