68 A/C hoses

[Dale C.]

Had another question on hoses but thought I would start another thread. The hoses for the A/C on a 68 BB are a little different. They are not produced with markings anymore nor by Dr Rebuild. On Dr Rebuild web site they show what they used to come with and I had one old hose on my car. I then used the Dr Rebuild and my hose info. to stamp the hoses. Does anyone else have a picture of their old original hoses with markings? I’ll add some pictures. Left origional right new.
Dale

[Dale C.]

Re: 68 A/C hoses

Graig
Hoses, Note, no date and spacing on dots.
Dale

[Frederick W.]

Re: 68 A/C hoses

Hi Dale,
A little off topic, but I have a 68 small block with factory ac I'm putting back in.
Doc rebuild says that R134a not recommended for the original style hoses with clamps/tangs.
If we want to keep these original style ac hoses, what are the options to create a reliable and functional system using them?
thanks
Fred

[Brian M.]

Re: 68 A/C hoses

Use R12 JMHO

Hi Dale,
A little off topic, but I have a 68 small block with factory ac I'm putting back in.
Doc rebuild says that R134a not recommended for the original style hoses with clamps/tangs.
If we want to keep these original style ac hoses, what are the options to create a reliable and functional system using them?
thanks
Fred

[Tom L.]

Re: 68 A/C hoses

The problems associated with 134a are not only cooling capacity issues. Another problem is permiation. 134a will leak through the rubber ised in systems designed for r12. The reason is simple. When developing the rubber for r12 hoses they developed them for r12 and r12 only. In 19xx who knew that the CFC problem would outlaw r12. Simpoly put, molecules in 134a are smaller than r12 molecules. It will simly permeate. That's why you need new o-rings and rubber hoses compatable with 134a in the system.

Personally I wouldn't have thought twice about using 134a, I would have used it and I'm in the buisness. However things are changing. The price of 134a is steadily rising, Europe wants to phase it out like they did with r12 because it is a worse greenhouse gas than r-12. Also, I recently read an article in a trade magazine that the global demand for the primary base chemical in 134a is outpacing capacity to keep up. You can figure out what that will do to pricing.

In the past I've chimed in in favor of 134a for two reasons. In a properly functioning system it will perform fine, and eventually they are going to be alternatives to 134a. The up-side to putting the proper oils, o-rings and hoses is that more than likely newer alternatives will require these anyway so you'll be good to go in the event you have a leak.

With all that out of the way, I'd say make your own choice on refrigerants but plan ahead. Eventually some retrofits will have to be made as r12, and then after that, r134a dissapear. Of course if you have r12, put it in, even in a known leaky system if you like. the freon police are NOT comming. Have fun!!

[Terry M.]

Re: 68 A/C hoses

I only have part of this story, so excuse the partial information. My point is that the refrigerant situation is due for another change, but how it will effect us remains to be seen.

There is a new refrigerant coming to market. There is a Y in the name, but that is all I know. I only found out about it because one of my colleagues at school was at a conference about it in Orlando while we were there for the Regional. My invitation to him to join us for a bit didn't work out. Now I will have to ask him more about the refrigerant.

[Tom L.]

Re: 68 A/C hoses

Please do, I'm not in the auto end of the buisness but I'll do a little checking.

[Larry M.]

Re: 68 A/C hoses

I only have part of this story, so excuse the partial information. My point is that the refrigerant situation is due for another change, but how it will effect us remains to be seen.

There is a new refrigerant coming to market. There is a Y in the name, but that is all I know. I only found out about it because one of my colleagues at school was at a conference about it in Orlando while we were there for the Regional. My invitation to him to join us for a bit didn't work out. Now I will have to ask him more about the refrigerant.

Terry:

I think the refrigerant you mentioned is HFO-1234yf. It is patented and manufacturered by a DuPont and Honeywell partnrship.

I believe the patent on R-134a (and the $$$$$ that go with it) are soon to expire. So another PATENTED refrigerant is needed.

Larry

EDIT: Some info. http://media.gm.com/content/media/us...23_refrigerant

[Dick W.]

Re: 68 A/C hoses

Terry:

I think the refrigerant you mentioned is HFO-1234yf. It is patented and manufacturered by a DuPont and Honeywell partnrship.

I believe the patent on R-134a (and the $$$$$ that go with it) are soon to expire. So another PATENTED refrigerant is needed.

Larry

EDIT: Some info. http://media.gm.com/content/media/us...23_refrigerant

R-134a was a stop gap refrigerant, to be used until a "greener" product could be developed. There are several being used in various industries today that are more environmently friendly than R-134a.

At my age, and with more than adequate quanities of R-12 and R-134a on hand, I ain't gonna worry 'bout it