Interesting,so presume evaporators are the same as well.Quote:
Originally Posted by Grentarc
So how does the compresser work?
Does it load up,as someone has previously said on here?
If it does,what tells it to load up?
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Interesting,so presume evaporators are the same as well.Quote:
Originally Posted by Grentarc
So how does the compresser work?
Does it load up,as someone has previously said on here?
If it does,what tells it to load up?
There's 2 evaporators Paul, 1 front, 1 rear.
Here is my understanding of roughly how the VDC works.
There is a pressure control valve (PCV) which diverts compressor pressure to operate the variable displacement swash plate. If there is not enough pressure when the displacement is at minimum when it starts the swashplate won't tilt to increase the displacement, hence cooling won't start. Once it starts to tilt the pressure rapidly increases and then the wear in the valve doesn't matter.
I think it takes lowered pressure due to compressor wear plus a worn PCV to cause the issues to start. Sometimes replacing the PCV will fix it for a short time but the valve is usually stuffed from general wear of everything else so a new one doesn't last long, from what I read. Hence I asked for a new compressor which has fixed the problem 100% over the last 20,000km of high temperature driving.
It is enlightening to look up variable displacement compressors and see how they work. I assume that the LR version is externally controlled by an ECU and not internally controlled as older types were.
Glad I have a Defender when you guys talk about taking the body off to fix an engine issue!!
Chris
It is designed to come off,from those who do them all the time they say its not that bigger deal.Quote:
Originally Posted by cafe latte
Andrew
At the risk of derailing the thread...
I can't understand why people get hung up on the whole lift the body thing. If you see it in action, you'd understand that it's actually a great piece of engineering. After all, you don't object to having a bonnet do you?
Yes it means that major repairs are out of the reach of Joe Average DIYER, but realistically, how many would really do an engine change?
2 hours, maybe 2.5, and you have a peeled D3.
I have swapped so many engines I cant remember how many, but I would not want to remove the body to remove an engine. Most have been easy except a Fiat Regatta diesel. The engine was is the Fiat van at the time and diesel was becoming popular so Fiat in their wisdom decided to fit an engine in the Regatta that to be honest did not fit. To change the starter motor you needed to remove the engine mounts and drop the engine. To remove the head the engine needed to come out, myself and my dad worked for two days until dad spat the dummy and we pulled the engine. One reason I like the Defender is it can still (just) be worked on. Probably the days of fitting new liners, pistons and rings are over (so much for the world becoming green, rant rant), but I dont want to remove the body to change a compressor for the aircon which should be an hour tops. This is not just a Landy issue, too many cars are going this way.Quote:
Originally Posted by sheerluck
Chris
I knew that,just thinking if no rear air maybe the front evap is bigger,therefore taking more of the load,and balancing the refrigeration system.Quote:
Originally Posted by sheerluck
But it seems the compresser and condenser can handle the increased load of the rear evap,when used,and reduced load of just the front evap.
I read, the learning curve for LR, after so many turbo issues on the first few builds of the D4 .... which actually turned out to be less about the turbos I believe....got the maintenance guys to a body off scenario in less than 1 hour.Quote:
Originally Posted by sheerluck
Then you have free reign over the suspension, the engine, the transmission, brakes, etc, etc, etc.
It's a paradigm shift for old schoolers in the automotive world but not such a biggy on a car that will never need that sort of attention that often ... unlike other brands and models.
Look at aircraft designs ..... they've been splitting bodies and modularising all sorts of things for a very long time ..... it's not a new concept at all. It's an actual good outcome of Logistics Engineering and Design Engineering.
Update:
Picked the car up late last week, luckily the receiver dry filter exit side was clear so yes it was great it had not contaminated the rest of the system.
New genuine compressor, condensor ( radiator looking thing in front of the real radiator) receiver / dryer, gas & oil and labour. $3513
All good again.