Tip & How-To about Heating & Cooling
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 Ronado... on
Oct 14, 2016 | Cars & Trucks
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