Xantia blower motors

[CitroJim]

Why make life hard Steve parking is a sod at the NEC involving huge cost and queues... If there's a train at reasonable cost and ease then it will win every time with me...

I like to use public transport wherever possible and I'm sad it just won't work for my regular visits to Somerset...

Roger, some blower relay/ignition switch modification piccies for you:







The wiring will be the same as in Simon's original article...

My blower has been utterly perfect since...

[myglaren]

I agree with the logic Jim, just a car enthusiast visiting a car show and going by public transport seems to be a bit backwards.

[CitroJim]

Steve, I know and it makes me smile at the irony too but you know, a lot of people did the same thing! The train we were on was packed and most ended up in the show... The walkway between the station and the Show was utterly packed both on the way in and out... As were the trains...

[white exec]

At least NEC is really well serviced by rail, direct and weather-protected. Have exhibited there many times, sometimes for whole-week stints across all 10 or more halls (like IPEX, the printing exhibition). The distances to walk from one hall to others can be vast - what a complex!

Car parking by comparison can be miserable, distant and b.expensive. Do they still run shuttle buses?

[Rhothgar]

Aha! There is a little lane nearby where, last time I was there in 2015, it was legal to park on!

[Rhothgar]

Found it!

Blackfirs Lane. If you drive to the end of there, there is a wooded area which if you had an expensive car would be a risk perhaps. There is a little walkthrough. Play Frogger to get across the Bickenhill Parkway, enter the NEC site and catch a bus!

[Rhothgar]

The wiring will be the same as in Simon's original article...

My blower has been utterly perfect since...

Many thanks for that Jim. I've only just managed to log back on again. Obviously, I therefore didn't get around to it on Sunday. Maybe this weekend.

I have read a few articles on this on the forum. Some say, it could be connections to the blower, others ignition mod required.

As I rarely get much time these to do anything, I may as well ask the question.

My blower has actually stopped working. Will this mean that the ignition switch contacts are burnt out and further work be needed to clean some terminals up?

Also, is it possible to do this modification without taking the steering column shroud off just behind the steering wheel or will I need to do that anyway to locate connector blocks?

Many thanks in advance.

[CitroJim]

My blower has actually stopped working. Will this mean that the ignition switch contacts are burnt out and further work be needed to clean some terminals up?

Not completely as other things work off that set of contacts too - albeit low-current ones...

Check the multi-plug on the blower motor and look for volts there on the two thick with the motor connected... The multi-plug can high-resistance and stop the blower but if this happens it will smell burned...

Work through this diagnostic sticky to help isolate the problem too:

https://www.frenchcarforum.co.uk/forum/ ... 19&t=24786

Also, is it possible to do this modification without taking the steering column shroud off just behind the steering wheel or will I need to do that anyway to locate connector blocks?

No, having the cowls off is the easiest way to do the job and you need to anyway to reach the switch connector blocks.

If all else fails Roger, come and see me

[Rhothgar]

Many thanks Jim.

I've had a frozen shoulder for over a year now so mobility and doing things in confined spaces is very limited. I'll try and invert myself and squeeze into the required contortions to do the checking and remedial work if I am able.

I did see a post somewhere but it becomes very time consuming searching all the threads (and then finding the relevant post as there are so many). I know you've kindly provided a link so I'll have a trawl through that and try and see if I can see what I saw before. Almost a tongue twister there!

[CitroJim]

If you ever need help finding links or even to do the job then just shout Roger...

I'm quite serious about doing the job for you if you can't and I do appreciate with a frozen shoulder it is not easy...

[luisaam]

Hello, everybody

I've read all the thread, but couldn't find a similar situation as it occurs with the blower of my Xantia 2.0 HDI 2000. I would appreciate some assistance to see if I can sort this out.

The blower has stuck at full speed, working when key is at ignition position, as expected. Changed the ECU, but same problem. Changed the module with the two transistors (blower speed regulator ) in the motor, and the blower doesn't work at all. It isn't the speed slider, checked that the voltage variation caused by the slider reaches the ECU.

Any suggestions for further investigation?

Thank you

[CitroJim]

It will be the regulator module on the blower assembly without a doubt...

Where did you get your replacement? I've seen some faulty brand-new ones available from a well-known auction site that were wrongly built with the incorrect transistors - NPN rather than PNP Darlingtons. They gave your symptoms exactly...

A shame as they were well - made; just wrongly made... However they were recoverable by replacing the transistors with the correct MJ11015 ones...

The original module is not hard to fix. There is a guide on here. See https://www.frenchcarforum.co.uk/forum/ ... 12&t=22398

The most important thing is to get a matched pair of MJ11015 transistors - ensure they have the same batch numbers... If they don't, they will not current-share correctly and soon fail.

Hope that helps...

[luisaam]

It will be the regulator module on the blower assembly without a doubt...

Where did you get your replacement? I've seen some faulty brand-new ones available from a well-known auction site that were wrongly built with the incorrect transistors - NPN rather than PNP Darlingtons. They gave your symptoms exactly...

A shame as they were well - made; just wrongly made... However they were recoverable by replacing the transistors with the correct MJ11015 ones...

The original module is not hard to fix. There is a guide on here. See https://www.frenchcarforum.co.uk/forum/ ... 12&t=22398

The most important thing is to get a matched pair of MJ11015 transistors - ensure they have the same batch numbers... If they don't, they will not current-share correctly and soon fail.

Hope that helps...

Thank you so much for your instructions!

I am a native portuguese, so I'm affraid I can be a little lost in translation with my short technical english for electronics! After reading your instructions, I have the following questions:

What is a heatsink, as in "Clean the pillars on the heatsink. Replace the board on the heatsink."?

What is heatsink compound, as in "Smear just enough heatsink compound onto the new transistors to apply a thin even film all over"?

In this one "Make sure these joints are good as 10A", my knowledge of electronic issues fails me. How do I do that?

I understand these are very basic questions that a 10 year boy would ask, so thank you for your patience.

[Hell Razor5543]

A heat sink is a piece of metal designed to help get the heat away from its' source as rapidly as possible. On a transistor it typically has a lot of vanes, which help it to shed the heat. If a power transistor does not have a heat sink it will get very hot (to the point where it may glow!), and not last very long. The following link shows examples of heat sinks;

http://www.learnabout-electronics.org/A ... -sinks.jpg

Heatsink compound is a material (normally a paste) that also conducts heat, and is used to fill any air gaps between a heat source (such as a transistor) and the heat sink. You must make sure to only apply a very thin coating, as all you want to do is to get rid of the air gaps (as these will insulate the heat source from the heat sink, which you do not want). I use a silver based thermal compound between the CPU on my PC and the heat sink, as it is a very good conductor. This is the sort of stuff I use;

http://www.reviewcrossing.com/wp-conten ... up2063.jpg

While these may be basic questions you are asking, I have a simple attitude to questions (as do most of the members of this forum). The reason somebody has asked a question is because they do not know or understand the answer.

[luisaam]

Thank you, I got it all now.

Now, I have just bought the MJ11015 transistors, but I was told they were NPN darlington, not PNP. And the seller told me there wasn't such a thing as a PNP MJ11015, to be PNP it has to held another reference.

Is this a problem, that is, using MJ11015 NPN?