 | Home > Puma (Tdci) > Heater on cold but blowing out warm air |
 
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| ericvv Member Since: 02 Jun 2011 Location: Near the Jet d'Eau Posts: 5816   
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jamaica,
The Puma (surely the left hand drive versions) have from the early days an issue with left side air being warmer than right side air. Obviously not when the dial is turned to fully cold, then it should be unheated air both sides. But the issue of difference temp of left and right is a design issue. Land Rover got many complaints and then issued service bulletin SSM39653. This was not a recall, dealers should only effect that job for customers of relative new Pumas (within the factory warranty period) who seriously complained about the issue of different heating temp between left and right side. I complained several times in the first winters, then they were ready to do work at their expense, but I told them to forget about it when I found out that it is a complete dash out job. So in winter when driving with the Mrs. I turn the heating on to whatever is comfy for her, which then again is too warm for me at the driver side, but cracking the window open solves this. This may only be part of your problem, as said when the temp dial is turned to cold, no heated air should come out of the vents at either side. Just in case, the link to the service bulleting is below. It is a pretty basic fix, just taping up some of the area of the heater coil which blows air to the left side vents, almost is a bush fix, were it not that the dash has to come out fully. Which some say is easy, but when I saw below posted pic of a dash out, I decided that I could live with this design issue. 
Good luck. Eric Service bulletin link https://www.defender2.net/gallery/albums/u...er_fix.pdf Dash off 
 Click image to enlarge You never actually own a Defender. You merely look after it for the next generation. http://youtu.be/yVRlSsJwD0o https://youtu.be/vmPr3oTHndg https://www.youtube.com/watch?v=_GtzTT9Pdl0 https://www.youtube.com/watch?v=ABqKPz28e6A https://www.youtube.com/watch?v=rLZ49Jce_n0 https://www.youtube.com/watch?v=XvAsz_ilQYU https://www.youtube.com/watch?v=K8tMHiX9lSw https://m.youtube.com/watch?v=dxwjPuHIV7I https://vimeo.com/201482507 https://www.youtube.com/watch?v=ZSixqL0iyHw |
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9th Oct 2018 4:47am |
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| hank Member Since: 12 Sep 2016 Location: South Wales Posts: 2314  
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Same issue solved in the following thread http://www.defender2.net/forum/topic56603.html
Last edited by hank on 9th Oct 2018 12:00pm. Edited 1 time in total |
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9th Oct 2018 4:58am |
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| pj2106 Member Since: 20 Dec 2012 Location: Huntingdon AKA The Shire Posts: 1500  
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I have similar but the heat dial just spins so I assume it’s the dial which I will look at today 2008 110 2.4 XS Utility (Hagrid)
2002 90 TD5 Hardtop (Sully) Sold 1998 300TDi D1 (Billy) Sold |
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9th Oct 2018 6:30am |
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| camelman Member Since: 27 Feb 2013 Location: Peak District Posts: 3384
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HAve you got air con?
A couple of my pumas have had the same issue. HEater on hot, spin it around to cold, keeps pumping hot air out. Switching the aircon for 10 seconds or so, cold air starts coming out. Switch the aircon back off, everything sorted and cooler air continues. |
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9th Oct 2018 11:25am |
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| jamaica Member Since: 13 Aug 2016 Location: Bahia Blanca Posts: 6 
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Thank you guys for the suggestions and advise, I can now aim better to find a solution or to learn how to live with it
Cheers  |
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9th Oct 2018 6:05pm |
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| hornet Member Since: 04 Jan 2010 Location: Western Europe Posts: 362 |
Thanks for that, it is interesting! Shame on me, but I really do not understand why this modification will solve the problem. - Combing fins impairs heat transfer, but why only the second row on the left side?! - Sealing the last two rows also impairs heat transfer, but is significantly more effective. So maybe the idea was to reduce surface of the heater to make it warmer overall when operated? Reducing surface on the right side will not solve the problem of hotter air on the right side (!). The opposite would be helpful. In my opinion changing inlet with outlet also could make a difference because it is forced against the "natural" flow. Second, choking the outlet-flow would care for more homogeneous distribution. Any suggestions welcome! |
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30th Oct 2018 4:11pm |
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| ness Member Since: 03 Aug 2024 Location: Germany Posts: 1 
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@ericvv any chance you can repost the picture of your dash / fix mentioned previously, ideally also the service bullitin PDF? Seems like it was lost to time.
Thanks in advance! |
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3rd Aug 2024 6:42pm |
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| Johan_B Member Since: 20 Sep 2024 Location: Gothenburg Posts: 41  
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For those encountering this problem I'd like to add another possible cause for having hot air when control knob is on cold.
In the air inlet duct there are 3 water drain valves (Part No. MUC2417) before the fan. If anyone of them is missing you will get a mix of engine compartment air and fresh air. Enough to make it uncomfortably hot in the cabin. When we fixed this we also added some duct tape to the joint between the inlet duct and the blower assembly as this was only sealed with foam and dependent on the duct pushing against the blower. This may turn out to be a bad idea if that was meant to be the last water drainage before the blower. Time will tell, but so far so good and we now have ambient temperature air blowing out the vents. |
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3rd Oct 2024 9:21am |
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