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Old 02-12-14, 11:40 AM   #1
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Default Heater fan always on full

Hi. I've got a Peugeot 406 -00 where the heater fan is always on full speed. I've changed the control unit in the center console and the resistor under the passengers feet (left wheel steering).

Anyone have any idea what else could be wrong?
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Old 02-12-14, 07:34 PM   #2
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When you changed the resistor did you check the plug for any overheated , blackened , terminals ?
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Old 02-12-14, 07:45 PM   #3
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This does normally point to the resistor, did you get an eBay one as these have been known to be faulty/poor quality - not all of them, but some.
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Old 03-12-14, 05:11 AM   #4
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Quote:
Originally Posted by Techal View Post
When you changed the resistor did you check the plug for any overheated , blackened , terminals ?
Yes. Nothing...
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Old 03-12-14, 05:12 AM   #5
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Quote:
Originally Posted by Ginger Magic View Post
This does normally point to the resistor, did you get an eBay one as these have been known to be faulty/poor quality - not all of them, but some.
Ahh. Yepp, got it from the Bay and it was a non OEM resistor... Maby I shall try to order a new one then.
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Old 03-12-14, 06:43 AM   #6
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If you have a multi-meter, you can check power is going to the resistor, and coming out of the resistor ( power at the blower ) before replacing it.

Can you give the green connector and the thick wires going into it a wiggle to see if the fan goes off.

Don't forget you need the engine / blower on to test the power.
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Old 08-01-15, 01:55 PM   #7
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Tried a new resistor, OEM this time, and the fault is still there. I haven't tried a multimeter...

Any more suggestions?
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Old 08-01-15, 10:41 PM   #8
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Hmmm, okay.

I'll have a think, but the resistor effectively 'slows' the blower down - so no resistor normally means a 'full speed' fan...

Perhaps as a free check, remove the heater control panel and clean the connections - it might not work but the controls have been known to fail, although this normally means you would have no blower at all....

Ooops, just re read that you have done that already..

Last edited by Ginger Magic; 08-01-15 at 11:01 PM.
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