Question about 2002 BMW 5 Series

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Blower on high. ac is digital and will not come on. replaced final stage unit or blower resistor and still having same problem. Blower on high all the time even when the vehicle is off. Ac wont even come on.

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  • leesi5871 Aug 16, 2009

    Thanks I will try that.

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  • 239 Answers

Change the temperature control box in the dash.

Posted on Aug 15, 2009

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Posted on Jan 02, 2017

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What is an AC diode fuse? I have a 2006 AWD Pontiac Torrent the AC/Heat doesn't work, I've changed all fuses for the HAVAC and still no AC/Heat blowing out of vents. What could be the problem?


Could be a number of thing's ! Testing the electrical circuit is the way to find out what's wrong . Using a wiring diagram and a DVOM - digital volt ohm meter . Videos on youtube showing how to test it ! Without testing i would only be guessing . Does it work in high speed ? In high speed it by-passes the resistor . If it doesn't work in any speed more then likely the blower motor is the problem !
Air Speed
The HVAC control assembly applies ground to the blower motor control circuit that corresponds to the selected blower speed. The resistors and the blower motor are in a series circuit. The following list represents the number of resistors in series with the blower motor per particular speed request:
• Low speed--3 resistors
• Medium 1 speed--2 resistors
• Medium 2 speed--1 resistor
When the operator requests High speed, the HVAC control assembly applies ground directly to the blower motor through the high blower motor control circuit. The resistor card has a fusible link which, if blown, will require that the card be replaced.

Blower Motor and Resistor Diagnostics by Wells

Jun 11, 2017 | Pontiac Cars & Trucks

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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!

on Apr 10, 2011 | BMW 328 Cars & Trucks

1 Answer

My 08 BMW 328i ac blower fluctuates in speed. After starting, it goes to high, then to slow, periodically surging to high speed briefly. Max button does not force high speed. I have bench tested th


I have had the same problem on an older BMW. This is usually a symptom of a bad final stage resistor, an electronic module located in the center console in front of the front seat on the passenger's side. Google final stage resistor for your model and you will find the info. you need. Get ready for your back to ache hanging your feet over the front seat. Replacement modules are sold on ebay.

Oct 18, 2014 | 2008 BMW 3 Series

2 Answers

Fan blower not blowing


Most likely need a new blower motor resistor

Aug 04, 2014 | 2001 BMW 325Ci

1 Answer

My fan for the Ac and heater will not work. iam trying to replace the blower resister


the blower resistor is in the plenum... above the heater core.
If the blower motor does not work at all ... you may have a bad climate control switch.... or blown fuse even... as the resistor is a two stage coil... Low speed and medium speed... no resistor on High and would normally not go at the same time....

Sep 30, 2010 | 2004 GMC Envoy

1 Answer

What is the best access to the 2000 323i blower moter


remove Remove the glove box and rear trim panel to access blower motor, are u sure it is not the blower speed control that is the source of your problem? that is the most common failure
Here is a copy of the instruictions to replace that component if needed courtesy of Just Answer.com


I believe that the component the BMW tech was referring to is the blower final stage (like an electronically controlled blower resistor assembly). This is a very common failure item on this model, and causes the symptoms you describe.
BMW has a revised part number for this component, which lasts much longer than the original design. When you call the BMW dealer for the part, it is #(P/N 64 11 8 385 549).
The IHKA blower final stage resistor is located behind the right side footwell vent duct. Here is the replacement procedure:
(1) Remove the glove box and rear trim panel to access the area behind the duct.
(2) Remove the two attaching screws from the stepper motor bracket and carefully disconnect the flap rod from the stepper motor arm. Remove the stepper motor to access the final stage resistor. Note: Do NOT turn on the ignition switch while the steeper motor is removed from the case.
(3) Remove the connector from the final stage resistor and the two attaching screws. Remove the IHKA blower final stage resistor and replace it with the improved PN 64 11 8 385 549

Nov 22, 2009 | 2000 BMW 3 Series

1 Answer

Where exactly is the blower motor resistor for a 1997 E36 BMW located? The car has climate control. Is there a website or a place with photos specific to this vehicle??


Hi, hope the folowwing will help i found on internet if not email me at globalsat1@gmail.com. My service manual say its in the upper leftside of the heaterbox. remove lower left dash trim panel (drivers) and pull out resistor pack.

Fixing BMW E36 Blower Fan Speed . . . DIY!
It has been two weeks since my blower fan stopped working correctly on the low speed options (1, 2 and 3 ). It only works on high speed (Option 4). At first, I thought that the problem was in the fan speed switch because I’ve seen this problem before and when I told my electrician about it, he disassembled the switch and tried to clean it. Of course this solution didn’t work. So, I’ve decided to dig for the solution myself and I found that this is a pretty common problem among E36 cars. The problem is that speed 1, 2 and 3 are controlled by something called (Final Stage Unit on digital climate control units, Blower Resistor Pack on analog climate control units). The 4th speed is actually uncontrolled, so, it simply bypasses the final stage or resistor pack units. That explains why the fan works on the 4th speed and not the other lower speed options. Anyway, I tried to find a DIY (Do It Yourself) procedure on how to fix this problem and I found one that was written by "Deem3" on bimmerforums (thank you Deem3 for the great write-up). Now take a look below. It’s a really simple procedure. I will be trying it this weekend to see how it goes. I will post more details about this job soon. Symptoms (2 cases):
- Digital Climate Control: All the lights on your digital climate control are working and the buttons respond but the blower doesn’t blow any air.
- Analog Climate Control: The blower doesn’t work except on the highest speed (4th position).To replace it, we need to take off the driver’s side knee bolster. This only requires you to remove two screws,one on the right side of the bolster and one on the left. Using the phillips screwdriver remove the following screws. Now remove the speaker and footwell light. Using the 10mm socket remove the 3 bolts holding the metal shield. And using the phillips screwdriver remove the obd2 port. Now you should be able to see the footwell air duct. Remove it by pulling it.
With everything out of the way you should now be able to see the defective final stage unit. Remove it using the torx-20 screw driver. Replace it with the new part and before you put everything back turn on your car and test the blower. If everything is ok proceed to put everything back, and enjoy the benefits of having a blower in your car again.
.

Aug 06, 2009 | BMW 328 Cars & Trucks

1 Answer

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

1 Answer

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

1 Answer

Blower Motor not working


hello the problem your having with the blower motor sound like the blower itself the brushes could be worn out causing the extra load on the blower resistor you may need to have a blower motor installed hopefully you won't need the resistor hope this helps you



workitover

Jul 24, 2008 | 1997 BMW 328

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