Replaced my A/C compressor along with accumulator and orifice tube. Flushed, vaccumed, and recharged with 3 12 oz. cans of R134a. Had a small problem with one of the o-rings causing a leak at the accumulator but quickly fixed that, re-vacuumed, and re-charged. A/C is working perfectly fine, blowing cold around 40-45*F. Only thing is when the compressor is engaged is sounds like its knocking, gets a little less noticeable as it warms up. Any one have any idea what this might be from? Low on pag oil maybe?

BTW, pressures were around 45 psi and 210-215 psi with ambient temps a little over 80*F.

Any insight would be awesome, the noise is driving me crazy after I spent all weekend on it!

 

See your thread in the HVAC section.

Please, only one thread (in the "best fit" section).

Let this one go dormant.