 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Car Forum / Porsche / Porshe 911 / May 2004Anyone done an R12 to 134a conv. in 911?
I have to rebuild the compressor and clutch on my Nippondenso AC unit in my 89 911 Carrera and hate to put R12 back in. Anyone done the switch? If so, how and what success? Thanks, T It will work, I haven't done it in a Porsche but other cars. Things to remember, change the receiver / dryer, if you can get the system evacuated before you load the r134 is also a good idea. Biggest issue is the oils are different and don't like each other. The r134 is also harder on compressors so you may not get the life out of it unless you can adapt a r134 compressor to the car. I have also heard some people say it may cause problems with aluminum, but haven't had that problem myself. I have a car that has been working good for two years since I changed it. I have a 1974 911 with air but it is missing the compressor and mounts. I plan on finding late model parts and make necessary connections to make it work. Good luck and stay cool. > I have to rebuild the compressor and clutch on my Nippondenso AC unit in my > 89 911 Carrera and hate to put > R12 back in. Anyone done the switch? If so, how and what success? > Thanks, > T I've changed over two 944s by adding the special mixable oil and the R134 and changing the fittings. no other effort on one, on the other, I evacuated the system because a hose had blown and it had gotten air into it. both work fine. > It will work, I haven't done it in a Porsche but other cars. Things to > remember, change the receiver / dryer, if you can get the system evacuated [quoted text clipped - 16 lines] > > Thanks, > > T > I've changed over two 944s by adding the special mixable oil and the R134 > and changing the fittings. no other effort on one, on the other, I > evacuated the system because a hose had blown and it had gotten air into it. > both work fine. What was the name of the "mixable" oil if you remember. T I don't remember - I went to pep boys and they have it on the shelf with the R134 - there is a conversion kit with some fitting adapters and this oil - it says basically "screw on these adapters, evacuate the old freon, add the oil and refill with 134" we'll see if it's really any good after another decade. > > I've changed over two 944s by adding the special mixable oil and the R134 > > and changing the fittings. no other effort on one, on the other, I [quoted text clipped - 4 lines] > What was the name of the "mixable" oil if you remember. > T Hey all, I found this: http://www.jcwhitney.com/webapp/wcs/stores/servlet/ProductDisplay?product Id=8367&catalogId=10101&langId=-1&Ns=p_MIN_PRICE%7C0&storeId=10101 My system is pretty weak - and hearing this conversation makes me want to do it... Do I need to have the system evacuated first? Is it at all dangerous? dont want to damage me or the car... Cheers, -Adam if your system is not working, it probably has no R-12 in it - but if you think it might, any AC shop will suck the R-12 out for free. then you can change the parts - after that , you can pay an AC shop to evacuate and recharge or do it yourself - you can use a borrowed vac pump or scrounge one. > Hey all, > I found this: [quoted text clipped - 14 lines] > > -Adam Basically the kit you have got here is a pre-packaged kit to supply the adaptors to the old R-12 connections as well. Any conversion to R134a will require the adaptors. But the first time out on the conversions I strongly recommend a receiver dryer change and an evacuation. 1. The adaptors are required because that is how they make sure you don't use wrong type of Freon. a. Problems, some of these kits are not high quality, not the adaptors they are fine, just the part that attaches to the can to put it in. Many a can lost from cheap kits, pay a little more helps. 2. The kits already have oil in them that is what the liquid is, the Freon is still a gas remember? So when you put it in READ carefully an how much oil to add, if can is upside down oil, upside right Freon only. You can get too much oil. 3. The dryer and evacuation. a. The dryer is what keep moisture out of the system. b. That is extremely important because moisture is the primary cause of a system not working well. The reason is in every system their is an orifice, the compressor pumps up the Freon to about 300 PSI on the high side, the pressurized Freon is then going to pass through a very tiny orifice, about the size of a hair, maybe less, after that is low pressure side about 75 to 90 PSI. ANY water will condense at tat point as the Freon expands it becomes very cold due to the "latent heat of expansion". Ice plugs the hole, no flow, no cool. c. So dryer,,, is full of silicone,(Like you get with your electronic stuff in a little packet) to soak up water once full or a system that has been left open for more then a day, it is garbage. d. Evacuation, neat thing about a vacuum, water boils and turns to steam in a vacuum, suck out the water well enough, that tired system will FREEZE you out. Stay Cool > Hey all, > I found this: [quoted text clipped - 14 lines] > > -Adam Coool.... After I posted that conversion kit the other day, I found another. its slightly more expensive, but a better known name brand. Might be better. http://www.jcwhitney.com/webapp/wcs/stores/servlet/ProductDisplay?product Id=8108&catalogId=10101&langId=-1&Ns=p_MIN_PRICE%7C0&storeId=10101 I am going to give it a try within the next few weeks.. Ill just get my system evacuated and then use this kit. The system was working rather well until the end of last summer. Its now kinda weak.... It will probably be 2 weeks before I can get the system evacuation done, but I will let you all know how it goes. thanks, Adam > Basically the kit you have got here is a pre-packaged kit to supply the > adaptors to the old R-12 connections as well. Any conversion to R134a will [quoted text clipped - 39 lines] > > Stay Cool http://home.howstuffworks.com/ac2.htm Pretty good short description of how AC works. FYI Good luck all. Don't let the heat get to ya. > I've changed over two 944s by adding the special mixable oil and the R134 > and changing the fittings. no other effort on one, on the other, I [quoted text clipped - 24 lines] > > > Thanks, > > > T Any of the "ester" based oils should work. The Pag oil which is used with F-12 is what you're replacing and it is not compatible with 134; however, the ester based oils will tolerate a little of the old stuff. Remember: 911s are not 944's...which are (obviously) water cooled. You can change a 911 over, but the marginal cooling will be reduced even more, unless you add some additional condensing units (underneath the main pan or possibly the Griffith's left rear fender well unit with the built-in fan. Also...you can get a new Sanden compressor from Vertex for @ $350...which may be a better value than rebuilding. (If I'd seen that price, I'd not have bought a rebuilt one for my '88) Good Luck... > I have to rebuild the compressor and clutch on my Nippondenso AC unit in my > 89 911 Carrera and hate to put > R12 back in. Anyone done the switch? If so, how and what success? > Thanks, > T |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2008 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.