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28-02-18, 09:11 AM | #1 | |
Grown up member
Classic Audi Club Member
Join Date: Jan 2018
Posts: 33
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Heater control switch
I’ll be replacing the heater matrix at some point in the near future, currently the heater control switch only works on setting 3 & 4, very occasionally setting 2 will work.
Would this mean a replacement switch or is it possible I could fix it? |
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28-02-18, 01:45 PM | #2 | |
Senior Member
Classic Audi Club Member
Join Date: May 2016
Location: Displaced Northerner in Essex
Posts: 1,528
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Quote:
If it's anything like the B2 setup, it could be the ballast resistor associated with the heater fan.
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28-02-18, 03:20 PM | #3 |
4 ring whore!
Join Date: Jun 2008
Location: Rucava, Latvija
Posts: 3,816
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Yes, you can fix it. It is caused by heater switch contacts being oxydized or burnt. Contacts themselves could be removed from switches, just need to undo two bolts, and then tiny strips of sandpaper should be used to clean the contacts.
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01-03-18, 02:22 PM | #4 |
Senior Member
Classic Audi Club Member
Join Date: Apr 2008
Posts: 1,326
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Got a similar problem with my C3. Replacing the ballast switch didn't solve it.
Airflow of setting 1 is hardly noticeable. 2 and 3 work as expected. Tried sandpapering the area behind the selection lever but it made no difference. Is there anywhere else I could sandpaper or check? |
01-03-18, 09:47 PM | #5 |
4 ring whore!
Join Date: Jun 2008
Location: Rucava, Latvija
Posts: 3,816
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It's quite likely that the construction in question is similar to B3 one; contacts are behind heater switches, contact pack with six pin connector attached.
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07-03-18, 12:12 PM | #6 |
Grown up member
Classic Audi Club Member
Join Date: Jan 2018
Posts: 33
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Thanks for the replies guys. I picked up the matrix yesterday so when I have a moment I’ll get behind there and sort it out.
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