87 911 R12 worked ok but compressor front seal leaking some oil. Changed drier and compressor. System did not pick up R12 well on recharge. came in spurts. stopped after 28-30 oz.took > 1hr. should take either 41 (Dempsey book) or 47oz(Bentley) sight glass had lots of bublbes. was not cooling great. Low sides 45-60 high side ok. What is the problem? Sticky evap valve?

 

Apologies if this is a silly question: Did you use a vacuum pump to evacuate the system before recharging?

 

Yes. Held neg pressure of 30 too so no leaks

 

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