Asked by: Hafsa Markholenko
automotive station wagon

How do I change from r12 to 134a?

How to Convert an R12 to the R134a System
  1. Discard any R12 refrigerant still in the system by taking your vehicle to a licensed air-conditioning professional.
  2. Open the engine compartment of your vehicle.
  3. Push the high side retrofit R134a fitting over the old fitting and use a wrench to tighten it.

Consequently, how much is 134a in a r12 system?

Calculate how much R134a to use Since R134a is LIGHTER than R12, you must convert the charge weight to get the proper charge during your retrofit. Fill the system with 75 to 85% of the factory specified capacity to achieve the best cooling.

Additionally, when retrofitting an A C system from r12 to r134a what oil should be recommended? R-134a systems require PAG (polyalkylene glycol) oil of a certain grade. PAG oil is hygroscopic, meaning that it readily absorbs moisture from the air. Never leave the cap loose when storing PAG refrigerant oil. Some manufacturers recommend using less hygroscopic POE (Polyol Ester) oil instead of PAG after a retrofit.

Similarly, you may ask, what happens if you mix r12 and 134a?

The oils are different and not compatible and can cause an explosion. R134a is also a smaller molecule than r12 so if you HAD a small leak with r12 that you did not fix you have an even bigger leak now. R134a is so much smaller than r12 that it will leak right through the older hoses used for r12.

Can I use r12 gauges for r134a?

You can not use the R12 gauge for R134. You have to buy a new set. You may still use the R12 gauge for home AC (it is still R12). Sure you can with proper adapters.

Related Question Answers

Avram Yatzkov


How do I know if I have r12 or r134a?

R12 fittings look like a tire valve stem, with threads on the outside. R134a fittings look like a air hose 'quick connect' fitting.

Baba Xena


Can you still buy r12?

R12 is difficult to find now a days. It was phased out all the way back in 1994 and was replaced with R-134a. There are very few places where you can actively buy R-12 today.

Sebastia Hausotter


What year did r134a replace r12?

The year was 1993. In 1994 R134A was implemented. Car manufacturer's starting using R134A in 1994 on vehicles sold in the USA. R12 refrigerant was still used because stock piles were made in anticipation of the stop of production.

Changqing Vrabie


Can AutoZone recharge AC?

When it's time for an AC recharge, turn to AutoZone. We carry R134a refrigerant, PAG46 oil, AC stop leak, AC system cleaner, and more. You can shop online for same day in-store pick up or go to your local AutoZone to find the right AC solution for you and your vehicle.

Talla Huylmans


Can I replace r22 with r134a?

R134a refrigerant is an alternative that contains no chlorine and hence no ozone depletion potential. It's a greenhouse gas, though, and it doesn't work as well as R22.

Excelsina Falcorena


How much 134a do I need?

Most newer passenger car A/C systems do not hold much refrigerant (only 14 to 28 oz.), so you don't want to add too much if the system is low. One can of R134a typically holds 12 oz. of refrigerant.

Juanmei Kleinermanns


How do you tell if your AC has been converted?

To tell if it has been converted you can look for a sticker on the unit under the hood, which would indicate that it is R134a. And you can also look for R134a adapters, which would be located on the charge parts.

Iosu Imoz


Is r12 illegal?

As I've said, R12 is a nasty ozone-destroying chemical and should never be released to the environment under any circumstances, so in addition to being illegal to vent it, you have a moral obligation not to vent it. R134a is not an ozone-destroying agent, but it is a greenhouse gas, and is illegal to vent as well.

Sogues Nesgovorov


Can you use r134a instead of r12?

The R134A as a replacement for R12
As a result, replaced with other refrigerant gases out of which one is the R134A. Unlike the R12, the R134A contains hydrogen and fluorine molecules which is why it is known as HFC rather than CFC. Cars older than 1994 started using the R134A instead of R12.

Jeferson Agueda


Can you mix red Tek 12a with 134a?

Significantly less product is used to complete the same function. SYSTEM COMPATIBILITY: RED TEK® 12a is compatible will R12 or R134a systems including: Metal components.

Samay Gollarte


Can you mix r12a with r12?

R12a is a "drop in" replacement for R12, but IS NOT the same. It is a mix if different refrigerants (sometimes propane, hence the flammable concern) that will work in a system designed for R12. If your system just needs a top off charge of a few oz.

Marisela Dardour


What happens if you put the wrong refrigerant in your car?

If the wrong refrigerant is put on top of another refrigerant, the Expansion device will become erratic in operation. If the wrong refrigerant is put on top of another refrigerant, the Expansion device will become erratic in operation.

Ilenuta Luzardo


Can a car lose Freon without a leak?

Refrigerant gas does not “wear out” like oil nor is it used up like fuel. In a properly sealed system the gas can continue being compressed and released over and over, so long as it doesn't leak out.

Gogu Bohmler


Do I need to add oil after evacuating AC?

Above all, only trained and licensed professionals should work on AC systems. That way, there's no risk of doing any damage to the system, or letting refrigerant vent into the atmosphere. To answer the question title, yes, you will have to add oil to the new refrigerant.

Weston Schmied


What freon can be mixed with r12?

The other two refrigerants that are considered good replacements for R12 are R-401a and R-401b. R-401A is the mixture by weight of 53% of R-22, 13% R-152a and 34% R-124. It is good replacement for R12 in the applications where the evaporator temperature is -23 degree C and above.

Hafsa Nistico


Are r12 and r134 fittings different?

There is a lot of differences between the R12 and the R134a fittings, you can't mistake them. Yes, you can accidently fill a converted R134a system with R12, only if they left the R12 fittings on it. The fittings themself are so far apart from the function and operation, one will not interchange with the other.