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Post by Daz on Feb 28, 2013 17:24:19 GMT
In my '95 peugeot boxer the heater only works on the high setting, I've checked the wiring & it all seems fine, but here's where I'm in the dark, the wiring from the controller goes to what looks like a resistor on the heater motor housing, with 4 wires coming from the contoller, each of the wires becomes 12v + when the controller moves to the corresponding position, but as I said the motor only blows on high (4), it does very rarely blow on other settings, my question is, what does the resistor do? Does it somehow reduce the flow, making the motor blow slower? There are no other connections on the resistor, just the 4 from the controller.
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Post by Firefox on Feb 28, 2013 19:31:11 GMT
I think the way these work is that the resistor sections go in series with the motor. By bringing more sections of resistance into play the voltage across the resistor increases and that across the motor drops, making the motor run slower ( V = I x R ) If there is a fault and only one section of the resistor is working,the motor only functions at a higher speed: www.ehow.co.uk/facts_7773106_blower-motor-resistor-do.htmlEhow reckons the fix is to replace the resistor... I'm not sure how easy they are to repair, probably quite fiddly if coils and impossible if solid-state.
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Post by landydriver on Feb 28, 2013 20:25:04 GMT
Usually when the resistor is faulty its all or nothing which you seem to have.
Ive seen them just having dodgy soldered joints, they do get hot.
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Post by Daz on Feb 28, 2013 21:08:03 GMT
I'm going to whip it off again tomorrow & try cleaning the contacts up, the joints all seem to be fine, the contacts however are filthy
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