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I think the reason mine and others converted systems are so cold is that we replaced the expansion valves with newer ones.
The new ones from Egelhof are labeled as R134 valves which may explain the lower vent temps for the GTS as well as I am sure those used the R134 valves as well.
I'm sure the machining and metering of them has to be different compared to the R12 ones.
I think the reason mine and others converted systems are so cold is that we replaced the expansion valves with newer ones.
The new ones from Egelhof are labeled as R134 valves which may explain the lower vent temps for the GTS as well as I am sure those used the R134 valves as well.
I'm sure the machining and metering of them has to be different compared to the R12 ones.
hmmmm that's interesting.... where is it labeled?
Blake, do you remember your numbers?
I think the reason mine and others converted systems are so cold is that we replaced the expansion valves with newer ones.
The new ones from Egelhof are labeled as R134 valves which may explain the lower vent temps for the GTS as well as I am sure those used the R134 valves as well.
I'm sure the machining and metering of them has to be different compared to the R12 ones.
Blake,
I suspect it is more the new compressor. I was doing some reading on a Porsche ac document a friend sent me and that reckoned the compressor is good for 1000 run hours. Over here the ac runs most of the time and 100k miles at an average of say 50 mph would imply some 2000 run hours in a hot climate and engine bay. My ac is performing no worse than it was previously just that I never measured much.
Pretty sure the vac job was ok having purged the system from vacuum back to atmos pressure with a shot of 134 before vaccing that out as well. I felt Dave's description of the resistance to motion of the shaft was fair enough and I suspect mine is not what it should be so it looks as though I will have to bite the bullet or put up with what I have for the time being. For sure I was not happy with the suction pressure.
The micro wrench I successfully used.
Got the little buggers this morning!
Dave's post reminded me of a little micro socket set that I have but had plumb forgotten about. The 3mm socket seemed to get a deeper engagement of the screw allen head.
Getting the expansion valve out was facilitated by undoing the union on the inlet to fuel cooler. Why oh why they did not put one on the outlet of the cooler I guess we will never know but most likely [not unreasonably] they wanted to minimise the number of joints.
Now another possible dilemma comes to light- I was under the impression that they solved sealing issues by fitting the green coloured O rings. For whatever reason I had it in my head that they fitted these from 1990 model year onwards. The expansion valve and the cooler union both had black coloured rings in them. I have had no issues with joints leaking but then I must assume that most if not all the rings are the black type units and that they date back to 1992. My instincts are telling me to change the job lot whilst I am in there.
Ironically the boxes of seals available on the local market are close but not exactly the same size according to the data I have recovered on various websites whilst trying to find data about the sizes that seems to be non existent in the WSM- urrrgh! I figured they must be made to standard sizes [whatever the std is] and I should be able to get them locally. I figured they would be metric thus have nice round numbers in metric units but that is not the case and I saw some data for the various unions in the WSM that suggest those are made in Imperial sizes of some kind! Also the locally available rings although rated for 134a are coloured black- double aaaaarrrgh!.
Any suitable inputs appreciated. No wonder so many examples end up with the a/c ripped out- that is the last thing I need over here!
Hello! I need help with my e63. I now have access to the expansion valve, but how do I actually remove or disconnect it? I've been tinkering with those hex screws which do not actually hold them down. How do I unscrew or unattach the housing itself?
05-11-2019, 12:38 AM
