Question about 1999 BMW 328 Series

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1998 328i My ac/heat fan stopped entirely. Is the problem the blower motor or the final stage unit?

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  • Playmaker May 26, 2008

    According to my wife who drives the car it became intermitent the last couple of days and then finally stopped entirely today.

  • Outlaw55 Jun 11, 2008

    i have a 1996 328i, with same problem, slowly lost all control of vents, heater, aircond, intermittant no readout on control pnl.,,,I need ans. also, is it the control pnl. how to test?

  • bonisocal Jul 08, 2008

    Same problem, when I would turn on the A/C it started making a "straining" sound.. then 1 day later it quit completely... no air no fan...

    I took it to the Auto Bavaria in Hemet they looked at the fuses since I didn't have much time ... Nope not the fuses, so I'll have to leave it there tomorrow for further diagnostics... I'll let you know what they come up with..

  • Anonymous Jan 20, 2009

    I recently had to replace my whole 1998 328i Convertible air controler unit.  The fan would run intermitently, half heartedly, then finally nothing.  Cost about $800.  Six months later, same problem, except I get zero fan.  Zip.

    Not the fuses.  What is wrong with this thing?!

  • Anonymous Feb 01, 2009

    my heater will not blow



2 Answers

If the AC/ heater stoped entairly means , the problem is in final stage unit only.

Posted on May 26, 2008

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Well you need more detail to know, start by check your fuses

Posted on May 26, 2008


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Fan blower not blowing

Most likely need a new blower motor resistor

Aug 04, 2014 | 2001 BMW 325Ci


1998 BMW 328i AC Blower dead or on and off intermittently

Check the wire harness connector on the final stage unit for loose connection before replacing the final stage unit/blower resistor. I just fixed mine and found a loose connection. Good luck!

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My issue is with a 2001 Pontiac Grand Prix. The entire heating / ac / rear defrost unit has stopped working. In addition the day time running lights have also stopped working. Today in the middle of my...

about your heat i can help you i would say that for your heat the problem is the blower motor and maybe the resistor to so change those two parts and for your light im sorry i can help you good luck

Jan 06, 2011 | 2002 Pontiac Grand Prix

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No heat or air comes out and was told that the blower motor control was inoperable. Do I need to replace the entire blower motor or is the blower motor control a separate part?

If you have no heat blowing and no force of air in AC or blower mode , your blower motor (fan portion) under dash is the likely culprit. Check your fuses before diving in. As the motor wears the carbon brushes wear out.
A common symptom is that the motor starts and stops going over a bumpy road where its brush connection is intermittently bounced on and off.
If you only have alow or intermediate speed , that would be linked to the speed and motor controls.

Dec 11, 2009 | 1999 Lexus RX 300

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2002 530i bmw blower motor stoped working

Common problem. Most likely culprit is the "Blower Motor Resistor/Regulator; AC Final Stage Unit" Will cost you around $80-$100 for the part if you put it in yourself.

Jun 19, 2009 | 2002 BMW 5 Series

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My ac is blowing at various strengths no matter what setting

the final stage transistor(blower resistor) has failed most likely. It controls blower speed from a signal from the ihka (a/c control panel). the final stage receives the signal from the ihka of drivers preference blower speed. the final stage pwm (pulse width modulates) the blower motor. which means it turns it off and on very quickly to speed up or slow down the blower motor speed. It isn't the easiest part to replace. Usually at a dealership i would expect to pay somewhere around $600 (including diagnosis)but don't hold me to it. bmw dealerships stand behind their repairs and usually include a warranty with the part of 2 years unlimited mileage.

May 03, 2009 | 2003 BMW 325

14 Answers

Intermittent Heater Fan

ProTip: Your car is known as an "E36" body style. If you're Googling problems and you want to get to high-quality answers from people who own the same car and have probably dealt with your same problem, search for your symptom using the term "E36".

The classic symptom of a blower resistor failure is that the fan works on the highest speed, but not on some or all lower speeds. This is because the blower resistor is bypassed on the highest speed. You say your fan is intermittent on the highest speed, so it's unlikely to be the blower resistor.

If you have a "display" on your climate control (versus three large rotary knobs and no display), then your car also has something called a "Final Stage Unit" which is an electronic part that the system uses to change the motor speed. You may not even have a blower resistor in this case.

It is possible that the motor itself is bad, but generally these motors fail by becoming noisy, or they sieze up, or die altogether. They don't typically start and stop randomly. However, you can test this by connecting a test light or voltmeter to the motor when the problem is occurring. If there's 12vdc there but the motor isn't running, then your motor is bad. If there is no power there when there should be (i.e. fan is turned on), then the problem is elsewhere.

Or you can take a gamble and replace the final stage unit. Google "E36 Final Stage Unit" and you will find step by step procedures.

Mar 26, 2017 | 1996 BMW 318

2 Answers


What do you mean by "blower"? Is it the radiator fan or the fan inside the cabin that is for heating and ventilation?


Oct 22, 2008 | 2003 BMW 5 Series

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