Stepo Posted 27January, 2011 Report Share Posted 27January, 2011 Last year I had my factory 1985 Carrera A/C unit serviced and used it a couple of times with limited results. Everything was tested and replaced where needed, yet the relief was minimal as the temp really never got low enough. I understand the factory length of hosing is an issue and extra thermo cooling fans may improve the situation. I was wondering if anyone had tried to improve the standard setup and obtained results? I have been considering the Pro Cooler uprgades offered by Rennaire in the US (http://www.rennaire.com/). These upgrades look like they go straight in, providing a good fit and several levels of performance can be selected. Any feedback would be appreciated. Link to comment Share on other sites More sharing options...
frank964 Posted 27January, 2011 Report Share Posted 27January, 2011 Hi there Betty From what I have read in a tech paper the aircon in older 911's is not that efficient. There are 3 things you can basically check to make sure the system is running at it's best. *Check the refrigerant lines that run under the car have not been squashed flat, sometimes near the jacking points when the car has been on a hoist, I have come across this (actually at a Porsche specialist shop) *Check that the heated air damper from the heat exchanger is totally shut off *When the aircon has been running for a few minutes there should be a light sweat or build up of moisture on the larger of the two refrigerant lines connected at the refrigerant compressor in the engine bay (this is a good sign) Also if the system has a recirculated air switch, switch it on. This will cool the existing air in the cabin rather than try to cool the hot air coming in from the outside 'fresh air supply'. Hope this helps Frank Link to comment Share on other sites More sharing options...
Spence Posted 28January, 2011 Report Share Posted 28January, 2011 Frank's advice is spot on, sadly even if you do get it working 100% it's still not great compared to a modern system. Steve Varrasso has had some great success in improving the systems for an outlay of about 2k. There's a lot of options, if you look on Pelican Parts forum you will see many threads of the all the different combinations people have tried, the success and the failures. A popular air con mod lately has been to use a 993 condensor in a rear guard, people have been getting great results. Link to comment Share on other sites More sharing options...
webrest Posted 29January, 2011 Report Share Posted 29January, 2011 This unfortunately is where German engineering falls to the level of Mesopotamian building standards Dave Link to comment Share on other sites More sharing options...
Stepo Posted 31January, 2011 Author Report Share Posted 31January, 2011 Thanks for the comments from all. With the recent run of VERY HOT weather in Melb lately, I've had the A/C checked again and all components appear to be mechanically in order. As there is a never ending length of piping running from one end of the car to the other, it looks like I've lost the refrigerant gas in one of the connections. Dave comments ring true; the German's weren't too interested in cooling the car for their climate. Even though it's a hot drive, I still get a big smile on my face when I turn the key. Link to comment Share on other sites More sharing options...
Spence Posted 31January, 2011 Report Share Posted 31January, 2011 Dave comments ring true; the German's weren't too interested in cooling the car for their climate. It may be the case but 964s onward have acceptable air con... It's not a lost cause, spend the time and money and you'll get results. Link to comment Share on other sites More sharing options...
Whipit Posted 1February, 2011 Report Share Posted 1February, 2011 Sunday here in S.A. was 45 degrees, and we went for a long drive, the last couple of days have been 40 plus and driving to and from work also. My 996 air con is excellent, better than just "acceptable". Can't comment on earlier 911's though. I guess if you are going to be hot in a car it may as well be a Porsche though. Can't see any reason it shouldn't be able to be sorted, good luck. Link to comment Share on other sites More sharing options...
PCM911T Posted 21February, 2011 Report Share Posted 21February, 2011 2 leads for you - www.rennaire.com (Texas) and www.zimsautotechnik.com (Texas) both advertised in Excellence Mag 189 Feb2011. Kits claim to be good for Texas and Australia! Link to comment Share on other sites More sharing options...
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