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JackLongley

Member Since: 05 Dec 2022
Location: Penarth, Wales
Posts: 7

2007 Defender 110 Puma 2.4 XS CSW Tonga Green

Puma 2.4 Heater Blower

Hi! Long time reader, first time poster...

Firstly a huge thanks to this forum, reading through gave me a valuable trove of knowledge I otherwise would not have had and made my first Defender purchase just before Christmas a lot less daunting.

I've stumbled into my first issue where the Haynes manual and other posts aren't quite fully answering my question. I have a problem where the heater blower fan only works in position 3. If I'm right in my understanding, position 0 is off, and 1 and 2 are controlled through a resistor pack and 3 bypasses the resistors and is essentially just a direct connection. For me the fan works in position 3 which leads me to believe that it's the resistor pack at fault, and not the blower switch control cluster. However what has stumped me is the fact that if I switch the A/C on I should get a fan in position 0, but I don't - is this because the resistor pack has gone, or should I be looking elsewhere? I just want to verify my thinking before ordering a new resistor pack. I'm confident that the motor is still working, as it is as I'd expect it to be in position 3.

Tl:dr - Fan only works in pos.3, is this the resistor pack? No fan in pos.0 when A/C switched on - is this also due to resistor pack, or should I be looking elsewhere in the A/C system too?

Many thanks! I hope to be a more valuable contributor in months/years to come, but for the time-being I am a new Defender owner, getting to grips with these quirky vehicles that we love.

15th Feb 2023 11:19am

jpboost

Member Since: 13 Apr 2021
Location: Gatwick
Posts: 377

2014 Defender 110 Puma 2.2 SW Keswick Green

When the AC is on, it runs the fan as if you're on setting '1'.

So, assuming that the AC simply connects to the resistor pack in the same way as the switch, it's entirely expected that the AC will not switch on your fan if it only works on setting '3' (i.e. with the resistor pack bypassed.).

I don't see anything here that would suggest it's anything other than the resistor pack at fault.

Welcome to the forum, knowing their propensity for issues, I have no doubt we'll be seeing a lot of you

15th Feb 2023 3:26pm

macfrank

Member Since: 05 Nov 2015
Location: somewhere in the north
Posts: 1073

2015 Defender 110 Puma 2.2 SW Keswick Green

Yes it's the resistor pack or it's wiring (position 3 bypasses the complete resistor pack and wires).
The missing AC confirms that because AC creates a connection bypassing the sliding switch (coming via SJ26 in the diagram).

Click image to enlarge

15th Feb 2023 9:22pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17367

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

Note that the diagram above shows a LHD vehicle.

16th Feb 2023 8:43am

macfrank

Member Since: 05 Nov 2015
Location: somewhere in the north
Posts: 1073

yes, sorry; should be obvious once you open the bonnet

16th Feb 2023 11:29am

JackLongley

Member Since: 05 Dec 2022
Location: Penarth, Wales
Posts: 7

Hi all,

Apologies for the late reply, I thought I had hit submit previously, but clearly not.

Purchased a new resistor pack (once I finally found one in stock), fitted it - which was a simple, yet somewhat fiddly job. Tested, and working perfectly! Thanks all! 2007, 110 Puma 2.4, Tonga Green, "Leonard"

15th Sep 2023 6:08pm

macfrank

Member Since: 05 Nov 2015
Location: somewhere in the north
Posts: 1073

Thanks for the update!

15th Sep 2023 6:32pm

macfrank

Member Since: 05 Nov 2015
Location: somewhere in the north
Posts: 1073

A follow up from another Puma owner, providing details on the resistor:

In his case it was just a blown thermal fuse - the part that looks like a diode on top of the resistor pack.
Spec is 216°C, 10 A - https://www.conrad.com/en/p/eska-770-216-t...34099.html
He used a high-temperature solder.

Undeneath the green insulation there are two resistor wires wrapped around a ceramic body.
He admitted that he could just have measured them to see if they were intact, but he was curious.

2nd Jul 2024 5:58pm

hornet

Member Since: 04 Jan 2010
Location: Western Europe
Posts: 361

Thanks for the feedback. Out of interest: Does the air conditioning still run (only at level three) when stage 1 is not possible to achive?

3rd Jul 2024 7:48am

macfrank

Member Since: 05 Nov 2015
Location: somewhere in the north
Posts: 1073

Good question. I think he didn’t try, but from the diagram I’d say yes, as 3 is bypassing the resistor pack completely.

Also AFAIK AC and blower are completely independent systems, apart from SJ26 where AC connects a ground to stage 1 of the resistor to enforce a flow of air even if the slider switch is on 0 (that setting isn’t shown in the diagram).

I think the AC won’t know when the resistor pack has packed up. So it‘s a good idea to only run the AC with the blower on 3 then.

3rd Jul 2024 8:15am

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