Hi All, I have 85 Eldo 4.1 and have AC questions. Car was converted to r134a by dealership. According to my knowledge the only not changed was the condenser. I bought the car and had all AC components replaced with new. Once a year the R4 compressor would fail. The mechanic told me the R4 did not hold up to the heat. The high side 250 to 275 psi. I found a high density condenser and while fitting it also installed a 17 inch 3000 cfm puller six fan to replace the 12 inch. Evacuated system and filled oil and refrigerant. Here is the question. When using r134a charts for low/high side pressure with ambient temperature. When I obtain the correct pressure the cooling efficiency becomes less. The vent temperature lowest 60 degrees. I found online that 30 degrees was acceptable for ambient 90 degrees. I slowly reduced the low side in 5 psi increments to 30 psi at idle high fan, 90 degrees ambient. The vent temp is now 48 degrees at idle. Driving the highway 42 degrees. The compressor stays engaged-no cycling to indicate low refrigerant. It appears to me that it was overfilled using chart. Parameters now are 30 psi low side 175 degrees high side @ 92 degrees ambient. Any thoughts?????