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if i am converting my stock AC (79 Bronco) to 134, what all do i need to replace. i have heard that i need to get an O-ring conversion kit.
 

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I have converted a couple dozen Fords to R134A, all I do is add the recommended amount of PAG-46 oil to the system and I subtract that amount from how much freon the system holds, I also add a can of stop leak to the system for good measure. The real trick to making everything work good is evacuating the system with a good vacuum pump for at least an hour.
 

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There are several threads already... in fact, hundreds of threads covering R134A conversions.
 
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