heater fan

Talk about the 406's electrical system, what wires do what, how to add extra functionality, etc.

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D9406
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heater fan

Post by D9406 » Sun Sep 03, 2017 6:44 pm

The blower on my heater has stopped working. I read that the ignition switch can cause problems like this so after checking fuses which were all ok I wiggled the steering column while the engine was running and the fan worked properly.
Instead of stripping out for switch has anybody bypassed the switch to fix this problem?
1999 406 HDi 2.0 110 GTX Estate. 48k when bought, now 126K. Second owner.
Clutch changed @110k, bottom pulley changed, cam belt changed, EGR blanked.

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GingerMagic
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Re: heater fan

Post by GingerMagic » Sun Sep 03, 2017 7:13 pm

I'm not sure its that simple - although I'm no mechanic.

The blower only works when the engine is running, so the 'engine running' relay needs the feed from the ignition first - before off to the blower.

A new ignition lead is around £20 from eBay - I changed the one on my wife's Picasso and it took about 30 mins - as the new lead was an inch shorter so had to faff about rerouting it a bit.

Its been fine ever since though - this was nearly 18 months ago..
1999 T4 family wagon, slow as a turd but the kids like it
2002 Citroen Xsara Picasso Hdi90 - Dirtied by the kids, Dented by the wife....
Sadly sold the 406, best cars I have ever owned
PP2000 user, can help with faults / diagnostics in the Bournemouth area.

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Doggy
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Re: heater fan

Post by Doggy » Thu Sep 07, 2017 12:55 pm

I has the opposite problem - mine runs constantly at full speed as soon as you start the engine.
After searching previous posts, I'm 99% sure it's going to be the speed control module, on which at least one intrepid pioneer replaced the power transistor that does the PWM switching. Nowadays grabbing one from the scrappy is going to be cheaper/easier than changing the transistor, (particularly for a blind old ham-fisted solderer). :oops:

Since the loss of the Photobucket pics, can anyone remind me whether this module is mounted on the fan itself, or nearby in the footwell?
2003 HDi 2.2 6-speed Exec Estate

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steve_earwig
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Re: heater fan

Post by steve_earwig » Thu Sep 07, 2017 4:26 pm

I think they're on the blower motor. The pictures should still be available, you just need to find the links for them and view them on Bloatedfucker itself.
Talking bollocks sin©e 2007

2004 D9 2.0 HDi 110 Estate lhd VF38ERHZF81657352 - sold but being very well looked after.
1991 Yamaha TDM850 - fuel leaks galore!
2008 Toyota Recall4 2.0 VVTI ATM LHD JTMBH31V90D007261 - flimsy piece of crap.
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Doggy
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Re: heater fan

Post by Doggy » Thu Sep 07, 2017 9:39 pm

Cupboard was bare at the scrappy :(
- ordered one off fleabay for £9.99, here on Monday.
(part no. 6441 L2)
2003 HDi 2.2 6-speed Exec Estate

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Doggy
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Re: heater fan

Post by Doggy » Mon Sep 11, 2017 10:13 pm

Quick update - fleabay delivery arrived Saturday, fitted it yesterday and all's good. 8)

Definitely worth £9.99 to sort that out painlessly - involved a bit of footwell acrobatics.
Tip - remove the gadget from the heater 1st, then undo the plugs.
Reckon mine had been changed before - it was an OE Valeo item, but only 1 of the 2 screws was fitted and that was loose.
I made do with the 1 accessible fixing screw, but at least it's tight.
2003 HDi 2.2 6-speed Exec Estate

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