Tip & How-To about Heating & Cooling

Adding Refrigerant in Automotive AC system.

First of all let me introduce myself. I am an ASE certified mechanic and holds EPA certification on HVAC. Before I begin I would like to start with some warnings and caution when servicing automotive AC.1.) It is against the law to purposely vent any type of refrigerant out into the atmosphere, and that is including R134.2.) Never charge an AC system through the high side because it will burst the can, and cause injury.( although the system is design so that they low side has different connection). 3.) Never overcharge a system. Not only will it not cool properly, but it can damaged the system. 4.) Although R134 is none toxic, it produces toxic gas if exposed to flame. 5.) This last one is common sense, keep away loose clothing and any objects away from moving parts. Sometimes we overlook this when working on things. Now lets begin. Common cause of AC problem in cars is leakage. This is because the system is subjected to vibrations unlike in houses where the unit just sits there. Also the hoses used in cars are threaded kinds where the pipe in houses are brazed permanently. The system in a car has a lot of rubber O rings and and gaskets that fail over time. There are several ways to detect leak. One of the most common type is ultra violet light and green dye. An electronic leak detector is the best kind to use but they are expensice costing up to a few hundred dollars. A lot of the leaks can be repared by just relacing with new O rings and vice versa. Also leaks developed when the system is dirty, and turns acidic, eating a leak slowy on the evaporator. If the leak is really bad, it may sometimes be cheaper than having to buy all the tools required to fix it. If the system needs to be opened make sure that a recovery system is used. There is a hefty fine on releasing refrigerant purposely. I know if its an ozone depleting regrigerant, it can be as much as 32,000 dollars!! Probably the main reason why cars has adapted the R134 is because leaks are very common in cars, and R134 does not deplete the ozone layer, although it still contribute to global warming.




Posted by on

Heating & Cooling Logo

Related Topics:

Related Questions:

1 Answer

How to Become ASE Certified?


The process involves certified employment over a given period of time by an employer performing mechanical work on vehicles or a verified school certification, then you pay a fee and take their tests and if you pass, you get a certificate that says you are certified.

Oct 14, 2016 | Cars & Trucks

1 Answer

how do you put freon in?


get an hvac certified tech to do it. the epa are very strict. if you are one, open the left side and look for the schrader valve. if you can't find it, you are not hvac certified

Jul 10, 2014 | Bunn Margarita Machine Ultra 2 Slush...

1 Answer

I need a step by step manual on how to repair a 1999 dodge intrepid air conditioner


HVAC repairs should be done by certified technicians. The United States Environmental Protection Agency (EPA) has required that all persons handling refrigerants should be certified. If you are not certified you can't legally buy refrigerants.

Good luck, i hope this helps.

Jul 01, 2011 | 1999 Dodge Intrepid

1 Answer

AC come on but will not cool freon has been checked and some added but still will not cool and it is hot here in IRAQ.


well if your not HVAC certified, you have what is know as Synthetic freon and your not gonna be able to buy the real R-134a, also if your car is made b4 93 your not gonna be able to refill your freon with out a conversion kit. they don't sell the real R-134a because its a dangerous pollutant and you need to have an HVAC certification to buy it. Now if you had it professionally refilled and it will not cool, then your compressor or condensor needs to be serviced by a tech. They are extreamly delicate parts that must be serviced by a qualified ASE technicain

Oct 04, 2010 | Ford Excursion Cars & Trucks

Not finding what you are looking for?

364 people viewed this tip

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts

Paul Carew

Level 3 Expert

2557 Answers

Dan Webster
Dan Webster

Level 3 Expert

8220 Answers

Donni Steen

Level 3 Expert

659 Answers

Are you a Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Loading...