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  1. #1
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    Member No: 6101 evramsing is an unknown quantity at this point evramsing's Avatar
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    Heater Control Issue

    I keep blowing the heater control transistor on my '84 633. This last one lasted perhaps an hour. Any clues?

    Thanks.
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    Member No: 165856 LeeDKaiser is an unknown quantity at this point LeeDKaiser's Avatar
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    Yes | No
    Check out this thread: http://forum.roadfly.com/threads/118...r-2N3055-again. Bottom line is that TrevorM recommends a 2N5302 trnasistor, as it is heavier duty. I put one in 6 years ago, and it's all good.

    Also, make sure you use heat sink compound on the back of the transistor.

    Finally, be sure to lubricate the bushings on the fan motor. However, if the bushings are just too worn out, then the current draw will be high enough to blow any transistor, and you'll just need to spring for a new motor, which last time I looked a couple of years ago is about $60, so not too bad. Also, you'll see the motor and fan combination on eBay now and then.
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    Member No: 6101 evramsing is an unknown quantity at this point evramsing's Avatar
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    Heater control circuit

    Lee, this is great, thanks so much!

    -Eric R-
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    Member No: 134434 shaneyoung is an unknown quantity at this point shaneyoung's Avatar
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    Resistor?

    Anyone happen to know what type of resistor is supposed to go on the opposite side?
    Thanks!
    -Shane.
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    Member No: 165856 LeeDKaiser is an unknown quantity at this point LeeDKaiser's Avatar
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    There's a thread on bimmer forums on the topic of this resistor started Jan 6, 2013. From pictures, it looks like the resistor is 1 Kohm. However, there's another component on the same side as the resistor, and no one seems to know what that is.

    I'd say if the transistor unit you're repairing doesn't have the resistor, just replace the transistor with the 2N5302 one and make sure the bushings in your fan motor are not too worn and are well lubricated. If you blow the 2N5302 transistor, you'll need to replace the fan motor or repair the bushings (http://forum.roadfly.com/threads/129...0#post12950740).
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