940 Heater Fan Problem

Rob1950 · May 2nd, 2024, 20:43

The heater fan was only working on setting 5 when I bought the car. So I fitted a new resister and speeds 1-4 worked as well....until last week. It seems to have blown again and thinking back, there was a burning smell entered the cabin, which was probably it burning out.

So there is obviously an underlying problem with the fan. Has anyone come across this and know what the problem & solution is?

360beast · May 2nd, 2024, 21:59

Did you keep the original resistor?

They get quite corroded which builds up the resistance in them. Try cleaning the corrosion off and see if it works, is it for an A/C car or non A/C? I might have one non A/C resistor left in the loft.

Rob1950 · May 3rd, 2024, 02:46

No, it got binned when the new one was put in. The new one I sourced from Skandex. It's non A/c. I was trying to think of why a new part would burn out so quickly.

Forrest · May 3rd, 2024, 12:44

Motor drawing too high a current? Potentially due to -

Blocked with dead leaves
Water damage
Short in one of the coils
Worn bearings
Dirty or worn carbon brushes
Permanent magnet losing its strength

In short, you probably need to get the motor out (a bit fiddly) and do some testing on the bench.

May 2nd, 2024, 20:43	#1
Rob1950 Junior Member Last Online: May 6th, 2024 22:45 Join Date: Nov 2023 Location: Craven Arms, Shropshire	940 Heater Fan Problem The heater fan was only working on setting 5 when I bought the car. So I fitted a new resister and speeds 1-4 worked as well....until last week. It seems to have blown again and thinking back, there was a burning smell entered the cabin, which was probably it burning out. So there is obviously an underlying problem with the fan. Has anyone come across this and know what the problem & solution is? __________________ If all else fails, read the instruction book.

May 3rd, 2024, 02:46	#3
Rob1950 Junior Member Last Online: May 6th, 2024 22:45 Join Date: Nov 2023 Location: Craven Arms, Shropshire	No, it got binned when the new one was put in. The new one I sourced from Skandex. It's non A/c. I was trying to think of why a new part would burn out so quickly. __________________ If all else fails, read the instruction book.

May 2nd, 2024, 21:59	#2
360beast Go redblock or go home Last Online: Today 22:55 Join Date: Feb 2012 Location: UK	Did you keep the original resistor? They get quite corroded which builds up the resistance in them. Try cleaning the corrosion off and see if it works, is it for an A/C car or non A/C? I might have one non A/C resistor left in the loft.

May 3rd, 2024, 12:44	#4
Forrest VOC Member Last Online: Today 05:35 Join Date: Feb 2008 Location: Gloucester	Motor drawing too high a current? Potentially due to - Blocked with dead leaves Water damage Short in one of the coils Worn bearings Dirty or worn carbon brushes Permanent magnet losing its strength In short, you probably need to get the motor out (a bit fiddly) and do some testing on the bench.

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