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Originally Posted by eightsandaces
Lil B,
Is there anything wrong with using one of those generic refills from the auto store that come with the cheese meter & tube if all you need is a charge?
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There is nothing wrong with those DIY kits from the auto store, assuming that you need it.
If you add too much refrigerant, many bad things can happen.
First, more gas does not equal more cooling, in fact too much gas will degrade the efficiency of the system.
Second, adding too much gas will raise the pressure of the system possibly compromising the 'o' rings and causing leaks where none existed before.
Finally, there are two types of oil used, and they are not compatible. These are PAG and Esther based oils. Manufacturers use PAG based oils because they are most efficient. Commercial operations and replacement kits tend to favor the Esther based oils which are less expensive, and less efficient.
The important thing is that adding more refrigerant (and the oil included with it is not a good thing. You can roughly determine the need to add more refrigerant by running the car, turning on the AC, and looking at the sight glass on top of the Receiver/Dryer (located under the service covers inside the hood next to the battery). If you do not see any 'bubbles' the system is fully charged and does not need any additional refrigerant.
Cheers!