Rear Climate Control (in markets where it exists) questions?
I own a MY12 D4 se and at the time of purchase requested rear air, but none were available for 3 months.
The salesman suggested it was a 12V compressor in the rear LH quarter.
Others tell me it's uses the same engine mounted compressor as the front climate control.
Which is it?
If it's a single system integral with the front, to both systems use the same Tx valve or is there a tx on each evaporator? I thought two tx was a problem.
22nd Aug 2013 3:19 pm
kathk
Member Since: 06 Jul 2013
Location: far away
Posts: 41
It uses a separate compressor in the rear. It's on the left hand side, you can see the pipes when opening the left hand side panel in the trunk. You can also see the condensation dripping down near the rear left wheel when it's working.2012 D4 SDV6 HSE - Heavy Duty, Alpine Roof, Sidesteps, modded LR RAI, Stebel Nautilus, Trailer hitch cargo carrier - Best Car I've ever owned
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23rd Aug 2013 4:16 am
DiscoDunc
Member Since: 08 May 2006
Location: Bristol
Posts: 16390
you can see it in this picture : middle left, behind the orange power connector
Click image to enlarge
Duncan
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23rd Aug 2013 7:00 am
phl
Member Since: 07 Dec 2012
Location: Sydney
Posts: 111
Is it a separate compressor or just a separate evaporator? I had always thought it was the latter.
Is it a separate compressor or just a separate evaporator? I had always thought it was the latter.
Will take a look tomorrow.
That's my question. In both cases it would need a separate evaporator and condensate would drain from below the evaporator. However it could use the compressor and condensor in the engine bay, in which case there will be plumbing to the rear and one would assume the rest of the system compromised by the load of two zones..
Or it could be a completely separate 12V system with compressor/condensor, evaporator and several fan systems for both the evap and condensor.
23rd Aug 2013 11:41 am
phl
Member Since: 07 Dec 2012
Location: Sydney
Posts: 111
Logically it uses the front compressor, but a separate evaporator; having crawled around under there quite a bit, fitting slider, compressor protection plate and GOE rods, there are no external heat transfer radiator (which would be the point of the compressor)
There'd be a pump for the evaporator though; my previous Pajero had a similar setup for rear a/c.
24th Aug 2013 1:57 pm
barryp
Member Since: 24 Dec 2006
Location: Sydney
Posts: 138
I agree, plumbing from engine compressor and separate evaporator in the rear. Had it fitted on my LR3.
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I guess one should never believe car salesmen, while they portray themselves as all knowing, they frequently know less than the customer.
I thought a 12V self contained rear system was too good to be true.
Diana
25th Aug 2013 2:28 am
PSC
Member Since: 01 May 2006
Location: Johannesburg
Posts: 255
I have rear aircon on my D4 and I can confirm that there are both refrigerant pipes and water pipes (for heating) running from the rear left quarter panel to the front of the vehicle.
The rear quarter panel houses the evaporator and heater matrix along with the blower unit.
Based on the performance of the unit - I would say that it signifcantly enhances the cooling capacity of the system and results in a more even temperature spread in the vehicle.
Note that the rear blower does not draw fresh air but merely recirculates the air in the vehicle.
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