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A/C Conversion to R-134A
Posted by Sjer (more from Sjer) on Sat, 17 May 2003 15:15:16
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A few questions about conversion from R-12 to R-134A. It is my impression that a lot of of previously recommended practices for conversion are not really described anymore as essential to a conversion. I don't want to do a half-assed job, but I really wonder if it's necessary to take apart the entire A/C system to convert to R-134A. Plus when you break connections that aren't necessary to break, you might end up with a leak that wasn't originally there.
1. Is it really necessary to flush the hoses, condenser, and evaporator? Why? Let's say you pull vacuum on the system for 30-40 minutes to evacuate the R-12. What is the purpose of flushing?
2. What type of oil used with R-134A is used with the "no-flush" conversion kits? Is is PAG oil? If PAG oil can tolerate small amounts of mineral oil, why flush?
3. Is it necessary to replace the original o-rings at fittings? I have been told it simply isn't necessary with say late 80s, early 90s vehicles. For new o-rings, I assume you lubricate with whatever new oil you are using when you install the o-rings?
4. I have seen the Interdynamics R-134A gauges criticized on this BB. What is so bad about these gauges? What else can you buy?
posted by 208.59.2...
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