General Heater blower stuck on full!

Currently reading:
General Heater blower stuck on full!

Yosser

New member
Joined
Jul 12, 2006
Messages
22
Points
6
I've recently bought a 2001 Scudo 1.9d, and just the other day the fan blower went straight to full speed without promting.

Sliding the speed switch makes no difference.

I've been trawling the net looking for hints, but there is not much there (or not much I've found).

Someone made reference to a diode packing up in the control unit, is this feasible?

Anyone any ideas?

Thanks
 
There is a control unit as part of the heater blower assembly this is normally the fault but could also be the crap slider speed control.Check the resistance of the slider control operation otherwise its no doubt the motor.
 
So, let me get this straight, the problem may be the heater blower itself?

if I can ask a stupid question, where does that live?

I have had the dash apart in order to see as much as I could of the slider, is that where the blower is too?

Thanks for your assistance
 
Brilliant.

Thanks for the pointer.

I'll investigate the blower itself.

There don't seem to be many of these things in the breakers, but I'll keep looking.

Cheers.
 
Thanks, that doesn't sound too deadly - I just have to find a replacement now.

I'm trying to avoid asking at the dealer for the meanwhile.
 
Thanks, another good tip.

Will inspect the original unit before I go any further.
 
Thanks again.

Very busy weekend ahead, so I won't be looking at this until sometime next week at the earliest.

I'll try to remove the existing motor (or at least get any part number from it) prior to attempting to buy a new one.

Cheers
 
Minor update on this fault.

I checked the voltage at the connection to the blower (4 wire connector) and I can get a varying reading by moving the fan speed control switch. I'm taking this to mean that the switch is ok and the motor/control unit is kaput.

I've removed the motor (easy job) and had it priced at the dealer - £160 !!

The control unit was around the £110 mark, so I think the whole thing would be a better bet.

A dealer not too far away has one in stock, so I may pop in there on my travels to see what I can get it for. The cost price listed on their system was £110, so I'm not expecting miracles.

Thanks again for the pointers, I'll let you know the final outcome.
 
Sorted.

I bought a complete heater moter assembly (including the control unit) for a little shy of £170. That hurt!

Fitting it was a doddle, and that is the problem solved.

It definitely helped having the original one in my hand for comparision with the new one, there does seem to be significant confusion over the different parts.

The part number was 9566944480. At least it has 12months warranty.

Thanks again for the pointers.
 
hi all i have same problem,reason is short circuit in motor controller FET transistors,orginal was type:BUZ 102=50V/42A N-channel FET.I replace them
to type IFR1010=55V/75 A(price 2,58 €) See attached pic. and now works well.
 

Attachments

  • fiat fan0005.JPG
    fiat fan0005.JPG
    825.8 KB · Views: 1,488
Excellent tip, I'll try that with the old controller I have.

Thanks for sharing the info!
 
What a great forum.

I am currently having the very same problems on my 51 Reg Fiat Scudo 1.9d.

The fan was stuck on full but now goes on and off when its likes.

I will do the checks as described in this post and report back.

Regards
Dave
 
Same problem on my 52 Plate Scudo JTD. When I put a meter on the connector Live & switch, I get 14v when the switch is in the off position, grading to 9v when the switch is fully on. I don't undertsand how a FET (field effect transistor) works so I'm not sure if these voltages are right. I suspect from reading this thread that the switch is ok and the blower assembly is at fault.

Does anyone have any more advice on how to remove the blower motor assembly?

Thanks
 
surf6ne said:
Same problem on my 52 Plate Scudo JTD. When I put a meter on the connector Live & switch, I get 14v when the switch is in the off position, grading to 9v when the switch is fully on. I don't undertsand how a FET (field effect transistor) works so I'm not sure if these voltages are right. I suspect from reading this thread that the switch is ok and the blower assembly is at fault.

Does anyone have any more advice on how to remove the blower motor assembly?

Thanks

Hi There,

I have just done the same tests on my 51 Plate Scudo.


I got the same readings so i take it that we are safe that the switch is ok...(y)

I have just removed the motor and have it in front of me as i type.

The motor can be found behind the glove box next to the Fuses.

3 star shape screws hold the motor in place. Its dead easy to remove. Just get a torch and have a look underneath the dash in the passenger foot well.

I had to remove one metal bracket to the right which is secured by a 10MM bolt.

Once that is removed. undo the 3 screws and the motor just drops out into the passenger foot well.

Here are a couple of photo's showing the motor from different angles.

Heater.jpg


Heater1.jpg


Dave
 
Last edited:
Back
Top