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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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Old 09-20-2013, 04:35 PM
oceanmaster66 oceanmaster66 is offline
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Location: NY
Join Date: May 2005
Posts: 7
Mein Auto: 2003 325I
E46 A/C Not Blowing

I have a 2003 E46 (325i) turned on the A/C and no air came out of the vents. I heard the compressor come on but nothing came out of the vents. A few days later it started working again until today, it just stopped blowing. When it was working over the last month it worked fine, the blower did not speed-up or slow down on its own. I checked fuse #50 (40A) and replaced with a new one, still didn't work. I also raised the heat to 91 degrees, it was 75 degrees today so it should have come on and still nothing out of the vents.

After reading through this forum it seems that the Blower Resistor (FSU) is a common component to fail causing no air to come out of the vents but it seems as though it becomes variable in speed before it dies. Mine just stopped altogether one day, started again, then died again.

Is there a way to find out if it's the Blower Resistor or the Blower motor??


Last edited by oceanmaster66; 09-20-2013 at 04:37 PM.
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Old 09-20-2013, 09:55 PM
GoForthFast GoForthFast is online now
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Location: New York
Join Date: Jul 2004
Posts: 3,188
Mein Auto: '04 330Ci 6-speed
If your problem is intermittant, probably is the FSR.

Most every time this is the FSR. Motor is not frequent.

Can check the motor by opening up everything and applying voltage to the leads. This is not fun, so I'd play the odds and do the FSR first. That's not fun either.
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Old 11-11-2013, 08:50 AM
John S John S is offline
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Location: Northern NJ
Join Date: Jun 2008
Posts: 2
Mein Auto: 325 Xi Wagon
I've read everywhere that the most common reason that the blower fan speed fluctuates is due to the FSR. I've replaced mine (the FSR) twice, 2 brands. Still have the same problem.
In the process of changing out the blower itself. It has a low speed sqeek that's been there for 5+ years. I'm hoping that works. If not, any suggetions?
I was thinking it was the GM5, but no functionality listed indicates the blower motor.
My symptoms: fan speed goes up and down. When I hit the brakes, the fan speen drops to near zero, then returns to normal. Sometimes the fan does not blow at startup, but then blows 10 minutes later.
Thanks for the help
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