There’s a sticker under the hood (Fig. 1), somewhere right up front, that tells you which refrigerant was used in the factory fill, and it also tells you how much. That sticker is part of SAE Standard J639, which provides safety and design standards for automotive air conditioning refrigerant systems.

R134a

If it is R12 the caps on the charge fittings will be about the size of the valve stem cap on your tires. If it was R134 then the fitting cap would be between the size of a dime or a nickel.

R134a is a safer replacement for R12. Another major difference is the type of oil both refrigerators require. R12 is compatible with mineral oil, and most R12 systems use this. R134a uses Polyalkylene Glycol (PAG) oil.

When was the was the last year car manufacturer’s used R12 in the United States? The year was 1993. In 1994 R134A was implemented. Car manufacturer’s starting using R134A in 1994 on vehicles sold in the USA.

How to Clean Air Conditioner Drain Line With Vinegar in 6 Steps | Drain Line Cleaning

1. Turn off your air conditioner.
2. Locate your condensate drain line.
3. Identify the access point on the drain line.
4. Flush with distilled vinegar.
5. Let the solution sit for 30 minutes.
6. Repeat each month.

If any debris particles enter the system, all components are at risk for damage. Flushing the AC removes the contamination and protects vital A/C parts. Be sure to have the AC flushed if the system is contaminated or whenever the AC compressor is removed or replaced in your vehicle.

There is no exact amount you need to add, but around ¼ a cup should be fine. – Repeat every month for a clean and bacteria free drain line! Be aware, that if at any time while doing this you see water pooled, or the vinegar will not go down the drain, you may have a blockage.