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Blower problem

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Candycj1
Posts: 12
Joined: Thu May 17, 2018 10:22 pm
Location: London

Blower problem

Post by Candycj1 » Wed Jun 27, 2018 10:17 am

Hi all

The blower on my 89 E24 only seems to work at full speed - nothing happens when turning the dial until it gets to the end when some mechanism can be felt to engage and the fan comes on full speed. Any clues on the cause / remedy? Note - if i turn the a/c on, then i *can* adjust the speed.

Thanks

ron
Senior Member
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Joined: Sat Jul 10, 2004 11:35 am
Location: South Wales U.K.

Re: Blower problem

Post by ron » Wed Jun 27, 2018 11:26 am

Try using the "search" function in the top R/H corner.

search.php?keywords=blower+resistor
They are ALWAYS rustier than you thought!!!!!!
'88 High line.
'85 M #228
'85 M #207
'80 735i

Tommys 89 635
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Posts: 333
Joined: Mon Oct 30, 2006 8:23 pm
Location: San Mateo, CA just South of San Francisco

Re: Blower problem

Post by Tommys 89 635 » Thu Jun 28, 2018 9:26 pm

Sounds like the blower motor going bad. I can have mine on low speed and I get a squeaky sound, turn the speed to high it goes away.
Tommy
1989 635 CSI (Second owner since 1995, driven daily and retired in 2013 to occasional driving)
2011 335D

Pod
Bigcoupe supporter
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Joined: Tue Mar 16, 2010 8:32 pm
Location: usually in the barn, Kent, England.

Re: Blower problem

Post by Pod » Thu Jun 28, 2018 10:19 pm

Tommys 89 635 wrote:
Thu Jun 28, 2018 9:26 pm
Sounds like the blower motor going bad. I can have mine on low speed and I get a squeaky sound, turn the speed to high it goes away.
Oil the bearings 😉

Tommys 89 635
Bigcoupe supporter
Posts: 333
Joined: Mon Oct 30, 2006 8:23 pm
Location: San Mateo, CA just South of San Francisco

Re: Blower problem

Post by Tommys 89 635 » Fri Jun 29, 2018 2:36 pm

true, oil would be good but since it will need to be taken apart, I'll go for a new part so I don't have to worry about it for years to come. [-o<
Tommy
1989 635 CSI (Second owner since 1995, driven daily and retired in 2013 to occasional driving)
2011 335D

Candycj1
Posts: 12
Joined: Thu May 17, 2018 10:22 pm
Location: London

Re: Blower problem

Post by Candycj1 » Sat Jun 30, 2018 10:53 am

ron wrote:
Wed Jun 27, 2018 11:26 am
Try using the "search" function in the top R/H corner.

search.php?keywords=blower+resistor
Thanks Ron - definitely sounds like its the heater blower transistor then as all other features work, just the heater that has the high speed issue. I'm not overly keen on the soldering idea but couldn't tell from searching if the board itself is still available as a straight swap, would anyone know?

BenM635i
Bigcoupe supporter
Posts: 117
Joined: Thu Dec 10, 2015 7:23 pm
Location: St Albans, UK

Re: Blower problem

Post by BenM635i » Mon Jul 02, 2018 10:54 am

Had the same problem myself i.e. only full speed blower. Used the troublshooting steps to ID the transistor in the actual blower dial itself as being faulty.

Swapped both transisters (blower speed switch in dash which is a pain to get in and out, also the one on firewall as its easy so may as well - only takes 5 minutes to do if the you are lubing the blower under the scuttle).

Unfortunately neither fixed the issue.

Had to take the plunge and buy the blower speed switch in the dash from BMW, came to £191 inc VAT as its the air con one, if you dont have aircon the switch is 'only' £140ish.

Fitted this weekend... success.

Now all i need to do is tackle converting the air con [-o<
'85 M635 #160

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JCS
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Joined: Wed Sep 22, 2010 11:06 pm
Location: Santa Ana, California, USA

Re: Blower problem

Post by JCS » Mon Jul 02, 2018 11:07 pm

Heater Transistor is 64111381784

A/C Transistor is 64111381785
Jay
'88 M6, Red/Tan
Hydraulic Brake Servo Booster Link.
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Pod
Bigcoupe supporter
Posts: 3751
Joined: Tue Mar 16, 2010 8:32 pm
Location: usually in the barn, Kent, England.

Re: Blower problem

Post by Pod » Tue Jul 10, 2018 6:49 am

Tommys 89 635 wrote:
Fri Jun 29, 2018 2:36 pm
true, oil would be good but since it will need to be taken apart, I'll go for a new part so I don't have to worry about it for years to come. [-o<
It’s a ten-minute job to remove the blower motor, oil the bearings and replace it😉

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