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  #1  
Old 04-28-2019, 01:21 PM
comsult comsult is offline
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Mein Auto: 2001 Z3
Heater control panel-Micro Switch

I'm in the process of repairing my heater controls. Broken tab on the temp control. Anyway, while I had to completely remove the control panel, I see that there is a micro switch on the centre wheel. The temp control wheel. What does this micro switch control?
Thanks for any feedback.
Greg.
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  #2  
Old 04-29-2019, 04:23 AM
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vintage42 vintage42 is offline
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Mein Auto: 1997 BMW Z3 1.9 5MT
Is it an actual electrical switch, or is it a holder for a spring loaded detent pin that is mentioned here:
https://www.bimmerfest.com/forums/sh...9&postcount=56
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Old 04-29-2019, 06:32 AM
fignewton fignewton is offline
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From what I have learned posting on another forum, it controls the electrical water control valve that opens to let water into the heater core. I was told that it opens just after you move the center control off of the fully cold (all the way counter-clockwise) setting.
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Old 04-29-2019, 01:32 PM
NZ00Z3 NZ00Z3 is offline
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@fignewton is correct with his description.
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Old 04-29-2019, 07:36 PM
comsult comsult is offline
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Thanks for reply, the switch was difficult to get into place, almost broke one of the guides.
Working through the radio hole, with two big hands is difficult, have the scratches to prove it.
So I just wanted to be clear, that if the guide did break, did I need to glue it into place, or just discard it.
After the reply, I gently, straightened out the guide pin, and thank heavens it did not break, then gently guided the micro switch into place.
I've taken it out for a run, and I do get hot air, and can now control the temp.
I replaced the broken tab on the dial with an RC control arm ball, Silicone grease in all channels and everything moves smoothly now.
Thanks to this forum.
Greg.

info on replacing the Plastic Tab.
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Last edited by comsult; 04-29-2019 at 07:55 PM.
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