So I got tired of the 134a conversion I did on my 7. Down here in TX we seem to sit at 115F for most of the year, so what is the point if the A/C didn't cool very well. My system has always held pressure, so that has never been an issue. What is an issue is the cost of going back to r12.

SO, in some looking around RX7club the 3rd gen section has a thread about ES-12a. Its a hydrocarbon refrigerant that seems to work really well. Its more efficent then R12, and of coruse more efficent then 134a. They have another version called I-12 that I bought for $10 a can. I picked up 3, but ended up using only one.

Pulled a hard vac on the system, put a single can in and I was sitting at exactly the pressure that the company said I needed to be sitting at. (38PSI on the low side) Oddly enough, you fill the system with the can inverted so you are charging with a liquid. Don't ask me how this doesn't destroy your compressor, but it works. You can use whatever oil you want, just as long as its clean.

It blows nice and cold now. I have found that this stuff loves some air across the condensor though. If you sit in stop and go traffic all day, it isn't for you. I could feal the temps drop as soon as I started moving from traffic lights. (This is irrelevent of RPM, I tried variations)

So, all in all I like this stuff. I suggest it. You can pick it up here: http://www.autorefrigerants.com/co00033.htm The company is pretty darn good as well. They answered all my questions very quickly

Also, My son had a great time helping out Dad fix the A/C. He is 2, and did a great job.

 

Just to add to your success;

you might want to think about adding a small electric fan on the condenser, wired in so that it kicks in when you press the a/c button. This should help should you be caught in stop and go traffic.


My father did to his GSL, and the a/c is ICE COLD even in the Texas heat, and Florida humidity.... the windshield develops condensation lol

 

I've been using Freeze-12 for several years in the Cosmo and several RX-7s. Only pulled vacuum on the RX-7 that I replaced the compressor. Just added it to the other systems. It's showing up in the ad at the bottom of this thread.

 

So Freeze-12 mixes with R-12 safely?

 

I've had no problems. Just hooked it up like the three dollar cans of R-12 I used to get from Woolco back in the day. I know a couple of people who have used it in their 70/80 cars.

Didn't mean to step on the thread. I've heard good things about the ES-12. Like Dan said, lots of the 3rd gen owners use it. No experience with I-12. The company he mentioned sells all three along with others.

 

I use EnviroSafe. Colder than R-12, way colder than R-134a, and they have all the documentation to prove it.

 

Ya, seems to be fully comptable. The ES and I12 stuff is as well.

A friend of mine is running the freeze 12 in his old diesel suburban and both the front and the rear ac blow nice and cold.

 

I have thought about mounting a pusher fan on the front, but this gives me an excuse to just drive faster . . . . .

In all honesty, most days around town I am just going to ride the motorcycle. I ride that 90% of the time, including that day when it snowed and all the days it was raining. Parking here on campus is 1/3 of the cost. What I need the car for is taking my son to school and road trips. And both of those I catch the highway so staying at speed isnt' that big of a deal.