air conditioning - circa 1968

my .02 i have redone the a/c systems on many 70 to 73 Z28's and trans ams. yes they are not fcars but they are still "old". i ALWAYS have found severe corrosion inside the lines, condeser , evaporator ect. every seal must be replaced when going from r12 to 134a. the oils in the 2 sytems are not compatible and form acid that will eat the system from the inside out. cheers to you for fixing the car, on the GM cars with cheap, available parts its a pain in the rear, on a fcar i hope you have a good idea where to get everything from. schrader valve is the number one source of a leak or faulty system. my 308 with the bloody nose is going to need all new stuff so i hope i have what it takes!!!

 

You can still use the original R-12 freon it is just much more expensive than the R134a but you will not have to replace everything else.

 

The components on Fcars are York, for the most part. My vendor said Pcars use them too. Single pulley clutches are a b___ to find. Only REAL tractors use 'em!! The stock clutch is a dealer only part, not cheap.

Mine was accidentally thrown away by a rebuild shop. Sigh.

"Hand me another one of them, from back there" ZZ Top

 

Yea, they smuggle that R12 now up north, 'cause it's better profit than cocaine!!!

 

BTW, there is nothing "illegal" about using R12 as a refrigerant in cars originally built for them. Virtually all 'legit' A/C shops and most car dealers have the necessary equipment, etc. to 'legally' handle it.

 

Best page I have found so far on the subject. He hasn't worked on any Ferrairs, however.

http://www.griffiths.com/achelp/achelp1.htm

 

Search the old Fchat tech Q&A archives.
There are a few vy good(imho) threads. Tifosi1 & I were redoing our A/Cs about the same time. I posted quite a few links to related sites as well.

I'd have stayed with R12 if I'd have the option.
However, as part of my agreement with the dealer, the A/C was fixed prior to delivery. His wrench jerker decided to do the R134a conversion & went ahead(sigh).


R12 is still legitimately available to licensed shops. The price varies as it's all 'recycled' & the number of cars going into salvage yards w/R12 still in them is declining fast. Last spring it was about $65/lb, went to $85 by end of June(peak demand).

 

Here's the older post by Tofosi:

(By the way, are ~1968 compressors York also?)

-------------------------------------------

In my case it was a clogged expansion valve. the drier had gone bad
> and dumped everything into the expansion valve. Below is what I did.
> The drier I used is a
> SCS/Frigette
> Part #
> 207 805
> XH9 DESICCANT
> WWW.scsfrigette.com
> Purchased at a local ACdelco AC shop for $49.00
>
> Expansion valve
> Murray Climate Control
> PART#
> MRY 38683
> THP AC3801C
> UPC 9636138683
> NO WEB SITE THAT I CAN FIND
> Purchased at O'Riely Auto Parts for $26.00
>
> High and Low side 134A connectors,
> high side $6.99,
> Low Side $15.00.
> Purchased at NAPA
> DON'T buy the Aluminum cheap ones.
>
> 3 cans of 134A Wal-Mart $4.88 each I only used 2
>
> 134A O rings Assorted $5.99 Autozone
>
> 2 8oz cans of ester oil
>
> I changed all O rings. took out the 2 Schratter valves and replaced them
> with the 134A connectors.
>
> I used an Aquarium air hose to drain the oil from the compressor. I
> siphoned it out, got about 8 OZ. added the ester until it would not take
> any more about 11OZ. Manual call for 330CC or 11OZ. I used a turkey baster
> to add the oil to the compressor.
>
> Drier remember not to open or connect it to the system until you are ready
> to Evacuate.
>
> Make sure the oil drier did not dump any Desiccant in to the hose going to
> the expansion valve. this is what killed me.
>
> Yesterday to was 93degrees here in traffic I got 60 degrees high way 50
> degrees. all reading from the lower vent.
>
> This evening 83 degrees, 86 heat index 40 Degrees at the lower vent.
>
> I have noticed one thing. Before my car ran at right below 195 on the
> highway, traffic right over 195, no more than the width of the needle. Now
> highway the needle is mid way between the 195 and the next hash mark. In
> traffic it stays on the hash mark. This mark is between 195 and 250.
>
> I will double check the car tomorrow to see if I have developed an over
> heating problem that may be unrelated to the AC. I did get a little air
out
> of the front radiator when I got home tonight. I'm going to drive it
> without the AC on.
>
> Per Neville in England I'm going to over fill my expansion tank. It's been
> about 2,000 miles since I have done this. When I had this over heating
> problem before, over filling fixed it. It cooked off what it didn't need
> and has been find ever since until now.
>
> OF course I am not responsible for anything that might go wrong with your
> car in this process. This is only what I did to make it happen. And to all
> your Ferrari Techs out there, please excuse my ignorance if I have said
> anything that sounds stupid.. Thank God I got some common sense from my
> father. I wish he were still here with me to take a drive.
>
> Kelly Vince
> Do you have the Passion?
> Tofosi

 

RB 276 is a direct "drop in" for R-12. I like it.

 

http://www.freeze12.com/

Drop in replacement for R-12, no seal changes, nothing

 

I have all the air-con parts from a 1968 365 GT, they were taken out when the car was restored and never replaced. I have the huge!! compressor,pipes,and what looks like a very thin radiator, if these are of any use please E-mail me, unfortunately. I live in the UK......................