How do I remove the R-12 coolant from my 1993 Civic ex? Also which one of the valves is high side and which one is low side?


Thanks,
Stephen

 

thinner line = high
thicker line = low

 

Also Larger fitting = low, smaller fitting = high.

Is there any R12 even left? Since you're interested in the low versus high side, I assume there is some problem and you want to convert to R134a.

Do not use one of those box kits to "convert" to R134a. Those are called "death kits" because they will kill your compressor. Spend a little time to do it right. You need to at a minimum pull the compressor off the car and change the oil in it to ester type (not the mystery stuff in the death kit can) and change the receiver-drier, putting ester oil in it too.

And of course if all the R12 has indeed leaked out, find the leak and repair it. Never use "stop leak," it pretty much never stops leaks but will cause major damage.