Im new to the Rx-7 world after i bought my grandfather's RX-7. Its a 1983 RX-7 pretty sure its the base model mostly stock
(some previous owner put a different exhaust on it) im getting the carb rebuilt because it has a vaccum leak but that's not why
im posting this. When i turn on my ac there is (as far as i can tell) no difference in the air temperature and i think it needs more refrigerant but where do i add it?

 

At the compressor. The High and Low side connections are made there and the compressor will have the bungs to hook-up to gauges. If the car hasn't been converted to R134a, yet - it will still need R12, which is what these cars used back in 1983. Look for a sticker, or take it to a repair place that will have the correct 'conversion' bungs to install R134a as the refrigerant. R12 is very expensive to replace and not worth the effort to stick to the original refrigerant if you plan to keep this car. HTH,

 

You'll first need to determine if the old R-12 Freon has been converted to r-134a. You can't mix the two. If you can't tell, take it to a repair/AC shop and let them do it.

 

Is there any good way to tell if its converted and if it isnt were can i get the conversion?

 

You have to evacuate the old stuff first using a special setup so the r-12 can be reclaimed.

 

How to: R152a conversion - S-10 Forum


^^^ I'm gonna try this soon here. This guy did a real good write up on it.


Edit: You don't want to convert to 134. Its a horrible waste of time. 134 has to run at such a high pressure you might loose gas like I did. 134 is an inferior gas compared to r12.

 

I've done the R152 (DustOff to the uninformed) to 2 vehicles so far and it has worked great.

One was a 1993 MAZDA Navaho (Ford Explorer rebadged) and the other was a 2000 BMW 323i.

The Navaho worked great until I dropped it at pull-apart because the rust was so bad.

The BMW I still have and its on the 4th year without issue or leaks or refills needed. Its colder air
than it ever was from the factory (bought the car new on 1999).

You will need a vampire tap for the DustOff cans along with the other AC equipment to charge it.
I used PAG oil, I think when I did this. R152 has the same heat caring capacity as R12 plus its
dirt cheap when Staple has a sale on dustoff at 3 cans for $10. It only takes 2 cans for most
systems.