1998 E36 318iS - Malfunctioning Climate Control

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  1. 1998 E36 318iS - Malfunctioning Climate Control 
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    Hi guys, I found a tutorial to fix the climate control by replacing a capacitor, now in the tutorial he speaks of using a 0.47uF 50V capacitor, but he also mentions that other people have successfully used 47uF 50V capacitors to do the same job. Now I'm sitting with 1uF 100V capacitors which I was wondering if they'd work... if not, why not?

    sorry, not meaning to sound rude, just want to know the physics/electronics behind it.

    Thanks in advance
     
     

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    Being the electronics engineer that I am, I can tell you straight away that you are holding a smaller value then the 47uF part. Your value is too small for the filter circuit, and you will need to solder 47 of them in parallel to make up that correct one used. Voltage plays no part in this as you are running 12V at the most through your circuit.
     
     

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    ok, thanks, although I'm still confused a bit. they speak of using 0.47uF and 47uF capacitors successfully, now from mathematics I know that 0.47uF < 1uF so how could it not work?

    The guy in the tutorial used 0.47uF and confirmed it afterwards
     
     

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    Yes, I see what you mean. I think some one was doing some trial and error and came up with the best value to use, or got confused with 47u and 0.47u. I suppose you can try your 1uF ones if it is not much trouble. The voltage does not mean much in your case, as it exceeds minimum 12V +/- tolerance.
     
     

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    SilentPixel (21-10-2008)

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    again, thanks, although what does the 0.47uF/1uF/47uF stand for? what unit of measure is it? Will I run any risk of blowing the climate control unit? Sorry, I'm just new to the whole DIY repair scene
     
     

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    what does the 0.47uF/1uF/47uF stand for?
    The unit values of capacitors in microfarads...similar to Ohms for resistors. I doubt very much you will blow your climate with these values. As the guy says, only used as filters
     
     

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    ok, I see, thanks, just wanted to make sure. Will try it and post back results
     
     

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    I utilized a 1uF 100V capacitor and it worked. My Climate Control has yet to switch off like it used to do regularly. I will test it properly tomorrow but I don't see how it could work now and not tomorrow
     
     

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    Nice one
     
     

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    Well I think it'll wokr for a while to come, this morning ont he way to work I was testing every single combination I could to see if it worked properly. After 30 minutes of sitting in traffic to get to work I figure that its working fine
     
     

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