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DC101

Member Since: 01 Jul 2012
Location: Pudsey, West Yorkshire
Posts: 260

Tracing an electrical fault on blower

Hi,

I've now booked next week off, so am looking to resolve a few issues on my 110. A long standing issue has been the blower not working. It keeps blowing fuses and the issue is not associated with the drain being blocked in the intake.

I have basic but proficient electrical skills and a multi -tester, so really looking for advice on a suitable methodology to resolve the problem (and not have to drive around with the windows open now the weather has changed!). I've noted the wiring diagrams available and will look to these, but want to start down the most obvious path first. Any pointers very welcomed.

Cheers,

Rob

7th Oct 2014 12:14pm

K9F

Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey

Isolate the blower itself if possible and switch it on with the ignition on. If the fuse still blows you know the issue lies with the circuitry and not the blower itself. Thereafter find a convenient point isolate the circuitry halfway and try again. Quickest way to find the culprit area but you will need a few fuses.

If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!

7th Oct 2014 12:19pm

Fatboy Slim

Member Since: 04 Feb 2008
Location: Bridgend
Posts: 1006

99.9 times out of 100 it's the motor itself or the wiring where it passes into the heater box mate

7th Oct 2014 1:57pm

DC101

Member Since: 01 Jul 2012
Location: Pudsey, West Yorkshire
Posts: 260

Is there a best way to isolate the circuitry to test?
Am I also correct in that the fan speed sliders act as the earth?
I'll check out to see how much the motors are, too.
Thank you both.

7th Oct 2014 8:38pm

K9F

Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

Pull fuse 45 rated at 30 amps and disconnect the black earth cable from the blower switch the circuitry will be isolated. Looking at the diagrams you should then have the following resistance values from the blower switch cables (cables disconnected from switch) these are your blower speed resistor values...

From the brown wire to the blue wire on the blower switch 0.45 ohms.
From the brown wire to the red wire 0.55 ohms.
From the blue wire to the red wire 1 ohm.

You can then carry out any further insulation resistance checks as necessary. Apologies if this is an 'egg sucking' exercise but may point you in the correct direction perhaps? Good luck. If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!

Last edited by K9F on 8th Oct 2014 2:43pm. Edited 1 time in total

8th Oct 2014 8:30am

dgardel

Member Since: 30 Nov 2008
Location: Veneto (Heart & Head)
Posts: 3586

Also check the resistors pack Discovery 5 td6 HSE Stornoway Gray Outback Engineering Limited Edition

IID Pro MV License

8th Oct 2014 10:27am

K9F

Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

Dgardel resistors pack checks are written above....the 0.45 0.55 bit.

If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!

8th Oct 2014 2:45pm

dgardel

Member Since: 30 Nov 2008
Location: Veneto (Heart & Head)
Posts: 3586

Discovery 5 td6 HSE Stornoway Gray Outback Engineering Limited Edition

IID Pro MV License

8th Oct 2014 4:22pm

DC101

Member Since: 01 Jul 2012
Location: Pudsey, West Yorkshire
Posts: 260

K9F,

Thanks: the help given by you is what makes this forum so great to less knowledgable folk like me.
Absolutely not teaching me to suck eggs and bizarrely looking forward to fixing the blower next week......
My last ask: does anyone just happen to know if it is it a case of dismantling the dash to disconnect the black earth cable?

Cheers
Rob

8th Oct 2014 5:17pm

K9F

Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

DC101,

You're welcome. Dgardel who posted above produced a comprehensive source of useful information. Follow the link below and contained therein are a complete set of wiring diagrams.' Workshop public' is the icon you need to head for. Don't get over excited about the 'Blower' icon that should read 'Bowler' from the photos........Happy hunting and good luck....

http://api.viglink.com/api/click?format=go...7269580318 If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!

8th Oct 2014 9:20pm

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