Shawn, I just did mine and posted a new thread. Warren claims the oil needs drained out of the York first. I did not do this, so time will tell if he is right or not.

My '79 SC had flare fittings thru out the system at hose connections. Furthermore, they are actually 45 degree standard SAE type fittings (not metric!) so if hoses later become an issue one could easily buy bulk AC hose and have fittings installed at a local hydraulic shop.

After 1 week in 90 degree temps mine is working great but others claim it is not the proper way to do it. Time will tell, read my post if you want a little more detail on what I did keeping in mind it may not be the correct way.

Timm and Hammer

You better do it or spent some money soon on mayor components.
The problem is yours .. The advice is free.

VicSmileWavy

Hmmm, some folks have to learn by experience, others by the advice of experts. The latter is much cheaper on the whole.:rolleyes:
http://www.4s.com/fourseasons/tech_tips/tech_tips_english/ab317.html
http://www.4s.com/fourseasons/tech_tips/tech_tips_english/ab324.html

Or just go to www.aircondition.com and type in "death kit."

Just to be clear, there's no value judgement here. Reading many posts, it's clear that there are cases where the quick and dirty method has worked and the a/c has been cold for years. But it doesn't get around the issue of the a/c's not working in the first place (if it were full of R12 and working perfectly, why would you retrofit?). You'll note in Tim's thread that he first did some leak detection and repair. Tim and Shawn, keep us informed of how well this works.

For now I am going to drain and change the compressor oil and change the dryer. I will call my local AC shop and check on a price to have them flush and vacuum the system. I can fill it with R134a at home.

I dont' see a clutch for the nippondenso compressor on the right. Do you have one?

Do you have a bracket to adapt the nippondenso compressor to the stock oem compressor plate?

Do you have the hose connection manifolds for the nippondenso?

If you intend to use the nippondenso, rather than the York, and you are on a tight budget, you could have you are on a real tight budget, after you locate the hose manifolds, you could have a new compressor to deck lid condenser hose made, cut and barb the low side (that's real low budget).

The nippondenso will need 6 ounces of the ester oil. Most ester oils are compatible with residual R12 mineral oil that is left in the system. I'd be suprised if between the under body hoses and the evaporator you have 2 ounces at best in there so don't fret it. We have converted over 900 (yes nine hundred) 911's and 930's from R12 to R134a and never had a compressor lock up, system clog or gum up.

Don't forget, as they posted a new drier.

If you get stuck, pm me and we'll help you out the best we can.

Do you have a clutch for that nippon?

Kuehl, do you think I am OK with what I did to my York set-up? Converted to 134 w/ new drier, system evac, added approximately 8 oz of ester oil and 3 cans of 134. (I assume w/ the ruptured low pressure hose at the jack point and the new drier, I removed some of the old mineral oil but obviously not all of it.)

It has seen about a week's worth of 80 mile roundtrips to work in 85-90 temps and is working great so far.

Others claimed what I did was wrong but it sounds like you have done basically what I did w/ good results?

This is why I decided to stick with the York. I didn't see any way without major fab work to get that rotary compressor to work. Remember this car is an SC Targa. Not worth a $1,000 AC upgrade. How much Ester oil will the York require?

Do I think you are OK with what you did?
Yes and No.

Yes, because it was the best thing you could do at the time based on what you knew and what you had to work with.

No, because I would have done it differently naturally.
I would have dropped in a different compressor, added a high low switch, change out all the lines, added other condensers and vents; something like this:
http://www.griffiths.com/porsche/ac/ice/index.html

But that is me.

Bottom line:
A) if the system is cold enough for you then all is fine.
B) if you added oil then the compressor is taken care of.
C) for now, drive it and enjoy it while it works, if something goes astray down the road you can address it later, might cost you more but you can wait until then.

thrown_hammer,

oil in york ?
you can get away with a range of 6-8 ounces,
too little and you get lock up,
too much and the evaporator gets saturated and you will
lose heat transfer