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#26 2023-02-11 01:32:55

Scudiro
Member
Registered: 2023-02-09
Posts: 2

Re: Heater blower

WHITE VAN ANDY wrote:

I had the blower re-brushed a year or so ago and my memory lets me down but am I right in thinking that the power goes to the motor via the resistor? Hence although I’ve got power going to the unit doesn’t mean it’s reaching the motor?

Had the same problem recently, agree with the diagnosis, power reaching the resistor does not mean power is reaching the motor. In my van I took out the unit (3 torx screws, awkward to get at), replaced the resistor, problem solved. AS OAT already mentioned, replacing the complete fan unit is also possible.

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#27 2023-02-12 22:31:26

WHITE VAN ANDY
Member
Registered: 2020-03-17
Posts: 4

Re: Heater blower

Cheers will try that first

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#28 2023-02-19 23:04:37

WHITE VAN ANDY
Member
Registered: 2020-03-17
Posts: 4

Re: Heater blower

So pulling my hair out now. Fitted a new resistor and tested it before bolting the unit back in and it was fine with fan working on all speeds. Put the blower back in situ, turned the heater on which ran for two seconds and now nothing again. Still got power to the unit. Helppppp

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#29 2023-02-20 20:08:02

AlvyLad
Member
Registered: 2021-06-11
Posts: 401

Re: Heater blower

WHITE VAN ANDY wrote:

Helppppp

TBH, I'd take it to dea(stea)lers, to find where what wires are burned this time now, instead of trying and trying and failing...
https://dispatchexpertscudo.org.uk/foru … d=1645&p=1

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#30 2023-02-21 14:16:49

OAT
Member
From: Borders/Dales
Registered: 2017-01-03
Posts: 914

Re: Heater blower

I have mentioned in previous blower threads that even after replacing my blower (and resistor) unit I still get occasional power loss.  This is instantly cured by gently moving the thick stiff bundle of wires feeding it. 

So my problem is likely to be either a bad contact inside the block connector, or a break in the live wire bound up in the loom somewhere.  Both entirely understandable as I have suffered the waterfall through the blower from blocked scuttle drains in the past.  And that inflexible bunch of wires does take stick when camping gear is stuffed in the footwell.

I live with giving it a wiggle when required.

Last edited by OAT (2023-02-21 14:17:23)

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#31 2023-09-15 13:18:09

OJKernow
Member
From: Cornwall
Registered: 2019-06-18
Posts: 6

Re: Heater blower

Another blower issue here!  neutral

Out of nowhere the blower has decided to come on full whack whilst the slider was in the off position. Regardless what I do with the slider, when the van is running, so is the blower, which is very annoying.

Reading through this thread am I best off replacing the blower altogether, following MRE's super helpful step by step guide, or is this problem likely being caused by something else electronical?

I am useless with electronics so I need specific instructions in terms of what fuse, or wire I need to be looking at if it comes to it  (have taken a photo of behind the glove box for pointers):D

IMG_6763.jpeg

Last edited by OJKernow (2023-09-15 13:23:05)

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#32 2023-09-15 17:08:20

kenbw2
Administrator
From: Preston
Registered: 2017-11-26
Posts: 1,292

Re: Heater blower

Prime suspect is the slider, it's crap. My blower is vaguely controlled by the slider, but mostly by bumps in the road haha

My previous van had a rotary dial in place of the slider


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#33 2023-09-16 12:39:45

Scudiro
Member
Registered: 2023-02-09
Posts: 2

Re: Heater blower

Happened in my van too, the resistor was the problem. At first the fan stopped working, then suddenly it came on full speed and stayed full speed regardless of the position of the slider. The only way to stop it was to pull the plug at the bottom of the fan unit. Not visible on the photo behind the glove box. You have to stick your head upside down in the passenger footwell and look up behind the glovebox. On the positive side, the plug is easier to reach than the 3 torx screws that hold the assembly in.
I'm lucky to have a donor van. Took the fan from that, held it under the glovebox so that I could push the loose hanging plug into it, and it worked, responded to the slider as it should. So the slider, fuses, relays, wires, plugs and whatever else were fine. The problem had to be in the fan unit itself, and as it was going full speed when plugged in, the brushes clearly were good and the only explanation was a faulty resistor.
Removed the fan with the bad resistor and replaced with the fan assembly from the donor van. All fine since then, fingers crossed.
As others have remarked here, even when the 3 srews are removed the fan unit doesn't come out easy, you may have to get some wires and/or brackets out of the way.

Last edited by Scudiro (2023-09-16 21:53:36)

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#34 2023-09-19 22:50:39

Eileen2006
Member
From: Suffolk
Registered: 2018-10-07
Posts: 32

Re: Heater blower

Scudiro wrote:

Happened in my van too, the resistor was the problem. At first the fan stopped working, then suddenly it came on full speed and stayed full speed regardless of the position of the slider. The only way to stop it was to pull the plug at the bottom of the fan unit. Not visible on the photo behind the glove box. You have to stick your head upside down in the passenger footwell and look up behind the glovebox. On the positive side, the plug is easier to reach than the 3 torx screws that hold the assembly in.
I'm lucky to have a donor van. Took the fan from that, held it under the glovebox so that I could push the loose hanging plug into it, and it worked, responded to the slider as it should. So the slider, fuses, relays, wires, plugs and whatever else were fine. The problem had to be in the fan unit itself, and as it was going full speed when plugged in, the brushes clearly were good and the only explanation was a faulty resistor.
Removed the fan with the bad resistor and replaced with the fan assembly from the donor van. All fine since then, fingers crossed.
As others have remarked here, even when the 3 srews are removed the fan unit doesn't come out easy, you may have to get some wires and/or brackets out of the way.

This blower motor business must be catching lol as mine has been playing up again too, specifically the one behind the glove box. I say the 'one' because Eileen has aircon and therefore 2 blower motors, the other being on the driver's side...... I wonder how easy that is to get at roll

Anyway my glove box side blower has done exactly the same as yours did Scudiro, on full speed all the time and not responding to the slider position so I did the same as you and pulled out the brown power supply plug. The full story is that a good couple of years ago the passenger side blower started getting very squealy and sounded like it needed to be replaced. I tracked down a complete new old stock unit and installed that. There was no issue with speed control with the old blower, it was just the squealy bearings. Then earlier this year, with no warning, the replacement blower went on full speed, so I pulled the plug and have just been making do with the driver's side blower for some months.

Now the winter is looming though, I want to get both blowers back to working. Being as there was no issue with speed control on the old blower, I thought I’d just swap over the resistor from this one to the new blower in the van – bingo! we had variable speed back again so it was definitely the resistor at fault. Unfortunately the fix only lasted for a day, then the old resistor must have blown as well because the blower went back on full speed all the time…so I’ve had to pull the plug again. I’m wondering if there is now something up with the newer blower motor causing it to draw too much current maybe, and keep blowing resistors. So my next move is to refit the original blower after a refurb, with another resistor of course. Has anyone on here been successful at refurbing these motors? Mine deffo looks like it needs new brushes as well as the bearings sorting or just lubing. Does anyone know a good source for these brushes or even just what size they are?

Something else that’s crossed my mind, that was touched on by OAT, is blocked scuttle drains. How easy are these drains to get at to check for blockages? Eileen is parked at home near conifers, constantly shedding debris which gets right down in the scuttle area so I expect after several years of that, there’s loads of muck that needs cleaning out and I really ought to deal with it before fitting a new blower. What’s more, the driver’s side blower is getting a bit squealy too so I don’t want that one causing trouble as well, especially before I get the passenger side sorted.

Last edited by Eileen2006 (2023-09-19 22:52:03)


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#35 2023-09-20 03:44:21

AlvyLad
Member
Registered: 2021-06-11
Posts: 401

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#36 2023-09-20 15:02:52

Eileen2006
Member
From: Suffolk
Registered: 2018-10-07
Posts: 32

Re: Heater blower

That's great. Thanks for the link fella!


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#37 2023-09-20 17:33:11

AlvyLad
Member
Registered: 2021-06-11
Posts: 401

Re: Heater blower

Eileen2006 wrote:
Scudiro wrote:

Happened in my van too,.



Now the winter is looming though, I want to get both blowers back to working. Being as there was no issue with speed control on the old blower, I thought I’d just swap over the resistor from this one to the new blower in the van – bingo! we had variable speed back again so it was definitely the resistor at fault. Unfortunately the fix only lasted for a day, then the old resistor must have blown as well because the blower went back on full speed all the time…so I’ve had to pull the plug again. I’m wondering if there is now something up with the newer blower motor causing it to draw too much current maybe, and keep blowing resistors. So my next move is to refit the original blower after a refurb, with another resistor of course. Has anyone on here been successful at refurbing these motors? Mine deffo looks like it needs new brushes as well as the bearings sorting or just lubing. Does anyone know a good source for these brushes or even just what size they are?

Even replacing the blower motor (w resistor) doesn't necessarily mean it is solved (as happened in my case), down to the resistor going "funny" it typically melts anything it can before fuse would go... wiring, sliders, relays etc, etc

https://dispatchexpertscudo.org.uk/foru … hp?id=1645

https://dispatchexpertscudo.org.uk/foru … php?id=239

if you in to in detail things (not a repair, but modernisation topic (briddy good BTW))
https://dispatchexpertscudo.org.uk/foru … hp?id=1080

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#38 2023-09-20 18:57:47

Eileen2006
Member
From: Suffolk
Registered: 2018-10-07
Posts: 32

Re: Heater blower

AlvyLad wrote:
Eileen2006 wrote:
Scudiro wrote:

Happened in my van too,.



Now the winter is looming though, I want to get both blowers back to working. Being as there was no issue with speed control on the old blower, I thought I’d just swap over the resistor from this one to the new blower in the van – bingo! we had variable speed back again so it was definitely the resistor at fault. Unfortunately the fix only lasted for a day, then the old resistor must have blown as well because the blower went back on full speed all the time…so I’ve had to pull the plug again. I’m wondering if there is now something up with the newer blower motor causing it to draw too much current maybe, and keep blowing resistors. So my next move is to refit the original blower after a refurb, with another resistor of course. Has anyone on here been successful at refurbing these motors? Mine deffo looks like it needs new brushes as well as the bearings sorting or just lubing. Does anyone know a good source for these brushes or even just what size they are?

Even replacing the blower motor (w resistor) doesn't necessarily mean it is solved (as happened in my case), down to the resistor going "funny" it typically melts anything it can before fuse would go... wiring, sliders, relays etc, etc

https://dispatchexpertscudo.org.uk/foru … hp?id=1645

https://dispatchexpertscudo.org.uk/foru … php?id=239

if you in to in detail things (not a repair, but modernisation topic (briddy good BTW))
https://dispatchexpertscudo.org.uk/foru … hp?id=1080

Thanks for making the point again that damage could have been caused to wiring etc when the resistor failed. I could be wrong of course but I don't think there's any issue with the loom etc having got overheated here because there is no sign of overheating on the blown resistor terminals, certainly not the one in the pic below that I've already removed. I've seen another post on here where there definitely were signs of overheating around the spade terminals. Also if there was a problem with the slider, I would expect the driver's side blower to be affected too which it isn't, its just got squealy bearings. Of course there could still be an issue with the loom supplying the passenger side blower I guess. I'll have to do some checks when I remove the motor next time.

2023-09-20-18_34_27.jpeg


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#39 2023-09-25 21:52:17

AlvyLad
Member
Registered: 2021-06-11
Posts: 401

Re: Heater blower

@Eileen2006 How is it going, any updates?

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#40 2023-09-25 22:28:26

Eileen2006
Member
From: Suffolk
Registered: 2018-10-07
Posts: 32

Re: Heater blower

AlvyLad wrote:

@Eileen2006 How is it going, any updates?

A bit of an update. Currently looking to source replacement carbon brushes for the original blower motor. The old brushes have definitely had it as you can see. The commutator looks fine though. Awkwardly the ends of the copper braids are crimped as well as soldered in place to the circuit board so I've just cut through them to remove for now, leaving part of the braids in place. Might be easier to just solder the braids on the new brushes to what remains of the old braids rather than try to remove the remainder from the crimps.

I'm hoping the motor, once repaired, will serve as a spare for either the driver or passenger side units. Service box lists different part numbers for the LH and RH complete assemblies but I'm guessing the motor is identical and its just the plastic housing it sits in which is different.

In the meantime I've removed the vents below the wipers and investigated down in the bowels of the ventilation ducts, to make sure nothing is in there that could cause issues with the blower motors - as suspected full of crud so gave both sides a good vacuum out, unblocked the drains and flushed through. I never realised before seeing your link that those vents were removable so thanks again. Also told my brother who has a 2004 dispatch and he was much appreciative, not least because he's been having water collect in the passenger footwell and assumed it was his windscreen leaking.

2023-09-25-22_17_22.jpeg


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