Question about 1990 Honda Civic

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A/C doesn't, doesn't know if compressor is good or not, i was wonder do i hav to replace the a/c dryer in order to switch it over to r134 from r12, or could i just get a r134 adapter and shoot some freon in and see if compressor kicks on or not and go from there

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Problem with either method is that you have to get all the old refrigerant and oil out of the system

it is advisable to replace the dryer and excavate the system for at least an hour before converting to R-134a

However I have seen people just shoot R-134a and go but I doubt their compressor would last very long

in your case, before doing anything....
REMOVE the belt and see if you can spin the compressor by hand....if ok
jump the clutch to make sure that works

if both are ok.... replace the dryer and then have a shop evacuate the system for at least an hour and you should be fine

Posted on May 14, 2010

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What else other than compressor must be changed on 561 to use r134 instead of r12


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I have a 1972 chevelle ss 454. I have ordered factory lines, compressor, condenser, and accumulator and poa expansion valve for r12. I will change oil, poa, 150. what else needs to be done with factory...


Use pag oil with a dye. Helps finding leaks. Think you have everything you need. Put the dryer on last and keep it sealed to prevent mositure from getting in. Pump it down for at least an hour on a new system.

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