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

[FinallyGotOne]

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!

[Drdogface]

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.

[dentist90]

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.

[Nicks911]

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

[Gogar]

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.

[JHanson]

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.

[tcar]

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.