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bodstruck

Member Since: 09 May 2020
Location: Wiltshire
Posts: 911

How freely should the blower fan spin

Due to water in the heater box my blower fan had seized. I have removed it and it does now turn but still feels stiff. I have liberally applied wd40 and will continue to do so.

If I connect up the fan it will turn but stops spinning immediately if power is taken away.

I have a feeling it should spin very freely. I'd rather not fork out for A new motor but I also don't want to refit it and find it either gets stuck again or the motor burns out.

Anyone have one out that can confirm how free it should be?

Thanks.

29th Jan 2022 7:08pm

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3414

2012 Defender 90 Puma 2.2 CSW Santorini Black

Mine does not rotate that freely either.
Keep in mind that wd40 is not a good lubricant. It is a Water Dispersant (hence the name). Use a bit of engine oil or something similar. As long as it can start on its own, it should be fine. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

29th Jan 2022 7:45pm

Oldowner

Member Since: 26 Dec 2018
Location: South west
Posts: 623

2007 Defender 90 Puma 2.4 HT Aintree Green

It should spin freely.

30th Jan 2022 8:24pm

bodstruck

Member Since: 09 May 2020
Location: Wiltshire
Posts: 911

I have been oiling it for the last couple of days and it is not much better

If I take the fan off I can't turn the spindle by hand. I also gets very warm by the spindle quite quickly. Rest of the motor body is cool enough .

I think I'll give it another couple of days and see how we go. Need to wait or the new seals and paint the box before it goes back on anyway.

Thanks.

30th Jan 2022 8:52pm

Leamreject

Member Since: 19 Dec 2020
Location: Middle Earth - Leamington Spa
Posts: 970

Oldowner wrote:
It should spin freely.

Agreed…

Ride like you stole it!!
If I’m not on a bike it’s because only a 4x4 will do…
2011 2.4 Puma 90 HT

31st Jan 2022 5:25am

bodstruck

Member Since: 09 May 2020
Location: Wiltshire
Posts: 911

Anyone know what the difference between RHD and LHD blower motors is? One is £40 cheaper than the other

Surely it can't be that much different, a motor is a motor after all

Perhaps they spin opposite ways. If so, could I just reverse the power going to it?

31st Jan 2022 7:58am

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3414

The vanes on the impeller might be curved in the wrong direction, as those need also match the scroll, which is a mirror image of the one on RHD vehicles.

But maybe you can use your old impeller and reverse the wiring. Have you confirmed mounting points? 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

31st Jan 2022 8:42am

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3414

Have you tried rotating the motor with an electric drill? Push and pull the motor shaft while doing so to massage the oil in.
Could you oil the rear bearing? 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

31st Jan 2022 9:05am

landy andy

Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5700

2006 Defender 110 Td5 USW Zermatt Silver

Don’t use WD40. It makes some plastics swell.

31st Jan 2022 7:12pm

bodstruck

Member Since: 09 May 2020
Location: Wiltshire
Posts: 911

Well, although I would not say it spins 'freely' it does spin well when connected up so I have decided to stick it back in and see how we go.

I have cleaned up the housing, repainted and fitted new foam seals to try and make it as efficient as poss.

Issue I have now is that it only works on low speed when connected up. The switch appears to be OK and power is getting to it. I swapped the low speed wire onto the high speed terminal and it span, just at low speed. I have tested the resistor and it reads 2.3 ohms which I believe is correct. Next job is to put power directly to the 3 pin connector on the fan housing and see how that behaves.

Any ideas where the issue may lie? Cheers.

4th Feb 2022 5:49pm

bodstruck

Member Since: 09 May 2020
Location: Wiltshire
Posts: 911

I think I have got to the bottom of it.

1. The wires were connected incorrectly on the dash switch so position 1 was actually the feed for speed 2. Hence it working on 'low speed' but not on 'high speed'
2. Power is getting through on both settings but the reduced voltage on speed 1 was not enough to overcome the physical resistance of the stiff motor so it was failing to turn.

I have sourced a complete second hand housing with motor so will swap over the motor and we should be good to go

7th Feb 2022 8:39am

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