[DML] Re: AC Question - 3 of them with a little surrounding information.
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[DML] Re: AC Question - 3 of them with a little surrounding information.

  As I was driving to pick up my lunch (mmm... corn dogs) I remembered 
one more thing that you need to do to convert to 134 like that.  
Evacuate.  Basically you need to pull as much of a vacuum inside your 
A/C system as you can.  Service shops that do A/C work will have the 
correct pump.  I don't know how much luck you'll have getting them to 
evacuate it for you though, you might be able to trade what's left of 
your 12 for part of the cost.  Or just getting them to do it at all.
  What you need to do is recover what's left of the 12, put on the 134 
adapters, evacuate (preferably with the engine warm) for at least an 
hour.  That makes sure that you get all the residual 12 out.
Again, this is not how you're supposed to convert to 134, so proceed at 
your own risk.


> I initially thought that i was low on R-12, so I was going to simply 
> flush out the R-12, drain the mineral oil, and fill it all with R-
> 134 and the necessary oil required (forget what it is called off-
> hand as I type this).
> I still have R-12 in the system. I hooked up a pressure monitor to 
> the low and high valves off the compressor in the engine bay, and 
> both sides registered about 22psi (Engine was not running)
> I do know that if you want to run R-134, it should be higher, but it 
> was in the correct range for the R-134, therefor, I am assuming that 
> the pressure for the R-12 is OK. 

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