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I've got issues with the hot one side and cold the other, reading many posts I changed the blend motors and it did nothing, gas was reading low on the air con so I went all out and changed the condenser, this hasn't solved the problem, so its the heater core, nightmare job and one that can wait until the new year, however having read horror stories about how much you need to remove for the air condenser change I thought I'd share a couple of pics.

First and my advise would be the day or two before, spray the slam panel/front section bolts with WD40 and leave them to soak as they are tight and if one broke you'd be in trouble. Then take off the bumper, lights and unbolt the 8 star drove bolts that hold the front section on. You do not need to unplug or remove any wiring/bonnet catches, only the parking sensors from the back of the offside light area, the bumper can lower down to the ground, then the slam panel section folds up and can be held back with a strap, that's it, you now have enough room to remove the bolts and take the air condenser out without removing anything else.

I heard horror stories of 8 hours +, honestly took me 2.5 hours, start to finish and I have never done one before on the L320.

I hope it helps, only sorry I didn't think to take more pictures.

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but, did it fix the issue? we also don't what year Sport you have. Please add that to your signature.
 

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Sorry no did say it didn't solve the issue so it will be a faulty heater core, a job for another day. Mine is a 4.4 V8 Petrol (Jag Engine) '05
 

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Discussion Starter #5
UPDATE**


So I'll start at the beginning so if anyone else (and many have) has the same symptoms, hopefully this will help.


2005 L320 4.4 V8 Petrol RRS RHD


Bought the car in the summer and the air-con failed so had it re-gassed, all fine for a few weeks then not so cold. The weather took a turn and cooled down so I thought I'd leave the air con for later, unfortunately when heat was needed in the car I found that the RHS would blow warm (but not hot) and the LHS would blow freezing cold regardless of where the control position was set.


Read through many posts on all forums and others commented on a ballooning noise behind the dash with similar hot one side cold the other symptoms and said that the fix for them was a re-gas? Odd I thought as I could understand why no gas in the air con could cause no heat, anyway I went with it, swapped out the old condenser for a new one, re-gassed... drum roll... nothing changed except now I did have air-con again so the condenser must have been faulty, however BIG problem, now the LHS was really cold, to the point my wife would sit in the passenger seat leaving me the passenger in my own car!! Oh no!


At this point I went to a local garage, a guy I knew well so he plugged the car in to test and re-set the blend motors as this was, according to forum posts the only other thing it could be, the readings all came back as OK, yet still cold on the LHS.


I then through other connections spoke to a garage who only repair LR's, he said 'If its blowing cold on the passenger side and warm on the drivers side then I am 99% sure it will be a blocked heater core'. He said I could try a back-flush but in his experience this rarely worked.


I read and watched some real nightmare stories about the dash having to come out and almost gave up on the fix, trouble is winter really set in and the car just wouldn't get warm, so I had to go with it.


New heater core £79, Saturday morning and its game on, bear in mind mine is a RHD so I was working on the drivers side. Removed panel above pedals, pull off panel under steering wheel and take off small panel to the side, your then left with the skeleton of the dash but you have access to the heater core pipes. (don't forget to disconnect the pipes under the bonnet before taking them apart in the car). Have a jug ready to catch any coolant and undo the two pipe clips and separate, then there is a screw to undo that holds a small clip, take this off, take off the small pipes from the core, its then almost free to remove.


The skeleton of the dash has a lip that sits in the way of sliding out the core, as this was my car all I did was cut out a small notch, never going to be seen as the dash parts cover it, this way you save hours of time taking the dash skeleton out, a simple 2 inch notch and the core slides out perfectly, new core in, whole job took two hours.


2[SUP]nd[/SUP] drum roll...... HEAT! At last..


So according to Steve at the LR specialist garage the core gets blocked up with grunge starting at the back and slowly filling it up, so the first symptom is cold at the passenger (LH) side, then getting cooler on the drivers (RH) side as the hot water cant pass through properly, whilst it can be blend motors he said that plugging in will show if they are working as in my case they were. My old heater core had liquid that looked like brown glitter.


I hope this helps others, wish I'd have taken pictures but honestly don't be put off doing the job, the hardest part is re-fitting the pipes as the clips are really fiddly.
 
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