Hello Fellow 911Sc Fiends! Happy early 4th -- A/C Questions
 

RE: 79 911 SC

So about 2 years ago I had the evaporator under the rear lid welded to repair a couple pin holes in the tubing. I think it registed 52 degrees out of the vents at that time after the repair. So pretty good I believe.

It is now blowing slightly coolish air, but by the time it travels the 2 feet from the vent to my face it is at best warm.

I am really curious, does anyone out there have a 911SC that has good working A/C? or... Has anyone removed the compressor, and all the parts and noticed an improvement in performace. Just tring to determine which way to go here...

thanks guys!

When I bought my SC about 8 years ago the compressor was shot. I looked into replacing it but never did. When I had the car partly resto'd I had them rip it all out... I've never heard of anyone who has said they work well so I 'lost the weight' and never have regretted it.

The answer is 'LEAKS'. Leaks thru the hoses, leaks at the fittings, leaks in the condensers...

I had an obvious leak (JB Weld repair) where the hose meets the front condenser, probably from curb hopping, so changed that out. Changed the rec/drier and took it to Ford to evac and recharge. Seemed to hold vac overnight OK, so charged it up. All was good for about 6 weeks, then started to lose cooling again. In goes the flourescent dye and can't seem to find the cause till I ask him to look under the front spoiler. TA-da! cracked front condenser tube as well. Changed this out 2 years ago and this is what I have at the vent today (~70F outside). This is with a 134a conversion as well, so there is hope. Not an SC, but the principle is the same.

http://forums.pelicanparts.com/uploa...1278093470.jpg

I have the evaporator, rear condenser, new lines and compressor from Mr. Jag. Its much better than stock and is adequate in most situations. However if the car has sat in a parking lot in direct sun and heated up the entire interior it can't really over come that.

Nick

If it's stock and never been repaired except for what you mentioned, then two years isn't too bad. If indeed you still have the system on R-12, then there's a few shops around town that still have some and will do a recharge for you. Finding leaks is time consuming but not too tough, and (like most Porsche stuff) can cost you anywhere from $.50 to $xxxx.

FinallyGotOne,

The stock AC system (with York compressor) wasn't holding a charge when I bought my 82 SC, so I bit the bullet and installed a complete Rennaire system with the Sanden compressor and the "Desert Duty" front condenser.

My system works quite well now, although I still don't think it's quite up to the standards of an average Japanese economy car. Mind you, my car is dealing with 100-degree-plus days in Tucson.

I pulled off the stupid diverter under the dash, and plan to add an extension and vent there to add to the air flow.

I looked into the Griffith's auxiliary condenser that fits in the left rear wheel well. There was no price listed on the website, so I filled in the approximately 30 questions they ask in their contact form in order to get a quote. However, I got an email back, still with no price but another list of questions, including my paint color, my plans for the car, and how much I weigh (okay, maybe not the last one). At that point, frankly, I gave up. It seemed like too much work to get a company to take my money.

The fellow at Rennaire, whose name utterly escapes me at the moment (Jeff? Jim?), was a pleasure to deal with.

My 79 SC with the York compressor, stock lines and condensers, R12 actually worked very well.

I removed the diverter (bowtie) under the dash, made a duct and attached a vent similar to the one in the center of the upper dash. Attached to the top of the console.

Even in the very high 90's, I would have to turn it down as I got too cold after driving for awhile.

I did have to add some R12 every other year, though, but not a full recharge.