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Old 23-04-15, 06:31 PM   #1
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Default Heater blower not working

Hi All,
The heater blower on my 406 hdi has stopped working, it worked the other day and then when i went out in the car today it did not work; i have looked at the wires that connect to the fan under the glove box and there appears to be little or now power there (red & black wires) then tested the other red and black wires that connect to the yellow/ green and grey wires there was power there (they seem to come through the bulkhead and travel to the blower motor module in the far right hand side of the foot well.
Does this mean the module is knackered?

All replies gratefully received
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Old 23-04-15, 06:38 PM   #2
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Yes.

If there is power to the resistor, but no power out of it then its probably goosed.

They are only about 22 on eBay and a 6mm bolt to undo it and slide it down from its crevice.

If you wiggle the wires by the green connector, the fan may burst into life if the engine is running - the only other culprit is the ignition barrel, but if there is power to the resistor then the ignition is probably okay.

Last edited by Ginger Magic; 23-04-15 at 09:07 PM. Reason: Extra info, I'm feeling generous....
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Old 24-04-15, 06:39 AM   #3
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thanks for that will check the power supply to the module tomorrow and if there will get new one sorted.
The power through the green/yellow and grey wires to the black and red to the module are only live when engine is running? Or is there power all the time
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Old 24-04-15, 04:40 PM   #4
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Only when the engine is running - there is a relay that activates when the engine is running that powers the blower and heated seats, so the battery isn't drained......
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Old 24-04-15, 08:35 PM   #5
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HI Ginger
Checked it and there is only power when the engine is on, am therefore going to buy a new resistor thanks.

There was hardly any power going to the fan, only just showing on multi meter - am surprised as the resistor was replaced just over two years ago and has gone again - oh well c'est la vie
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Old 24-04-15, 09:42 PM   #6
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How much power is going into the resistor?

If a little power is coming out, then the resistor is, well, resisting......

Give all the wires going into the blower and resistor a wiggle ( set the blower control to 'flat-out' ) and see if there is a particular connector that may simply need cleaning, before splashing out on a new resistor.
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Old 25-04-15, 04:23 PM   #7
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The wires coming through the bulkhead are showing 12 volts when engine running, but the wires to the fan red and black show virtually nothing so assume not enough power getting to the fan to operate it.
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Old 25-04-15, 04:46 PM   #8
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Hi Ginger,

JUst went out and wiggled the red supply wire and the fan kicked into life - Thank for all the help!
Enjoy the rest of your weekend

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Old 25-04-15, 06:13 PM   #9
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Thanks. Everyone likes a cheap fix..

Don't forget to plug/unplug the red wire to get a good connection in the meantime.
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Old 03-05-15, 02:51 PM   #10
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If i may add, if the terminals have got hot, it may be worth checking you pollen filter(if not changed it can put extra strain on motor/resister causing overheating in wiring) have had to replace part of loom a couple of times because of this
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