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Heater blower switch issues SOLVED

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635sharknose
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Heater blower switch issues SOLVED

Post by 635sharknose » Mon Apr 05, 2021 2:46 pm

My heater blower switch does not work very well.
If I turn it on 10x, it works 1x, and it only works at the maximum setting.
When I turn on the air conditioning, the blower works perfectly, it is then also possible to regulate the speed.
But with the air conditioning off it doesn't work properly.
Any idea what's wrong?

20210405_163721.jpg
20210405_163721.jpg (419.55 KiB) Viewed 374 times
Last edited by 635sharknose on Wed May 05, 2021 7:45 am, edited 1 time in total.
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Jlc
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Re: Heater blower switch issues

Post by Jlc » Mon Apr 05, 2021 3:37 pm

Sounds like the control unit is bad. It's easily fixable, here:

https://bigcoupe.com/phpBB3/viewtopic.php?t=2465

The heater and A/C blowers are controlled by separate units, and the heater one is much more easily accessible. I did the A/C one. I also replaced the thermal breaker and resistor on mine while i was at it.
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635sharknose
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Re: Heater blower switch issues

Post by 635sharknose » Mon Apr 05, 2021 4:57 pm

Thanks! Just what I needed.
I am going to take it apart and replace the transistor.
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tjeniel
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Re: Heater blower switch issues

Post by tjeniel » Wed Apr 07, 2021 6:53 am

Hi
The link w/pics doesn't work. Something to do?
Trond

tjeniel
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Re: Heater blower switch issues

Post by tjeniel » Wed Apr 07, 2021 6:59 am

I have the same problem as 635sharknose. I have ordered transistor 64 11 1 381 785 and hopefully it will be alright. Are there any other parts in the heater system that cause problems exept the fans. (I have changed both)

Jlc
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Re: Heater blower switch issues

Post by Jlc » Wed Apr 07, 2021 3:56 pm

tjeniel wrote:
Wed Apr 07, 2021 6:53 am
Hi
The link w/pics doesn't work. Something to do?
Trond
Try this:

https://bigcoupe.com/phpBB3/download/file.php?id=2989

It's a pdf.
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635sharknose
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Re: Heater blower switch issues SOLVED

Post by 635sharknose » Tue May 04, 2021 6:44 pm

Solved! Works perfectly again.
I also lubricated the bearings, runs like a charm :D

I have used a Darlington MJ11028, including thermal paste.

20210430_194018.jpg
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1987 635CSi Bronzitbeige

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