Back in 2014 I converted the R-12 system in my 84 Daytona Turbo Z, as it had developed a leak at the expansion valve where it meets the evaporator, and lost the charge. I had done other conversions without flushing, but foolishly decided to flush this system for maximum efficiency and longevity.
In the process, I removed the compressor and poured out everything, and when bolting it back on, sheared one side of the casting with little effort, while tightening a bolt. Had to buy a reman, as there were no new compressors.
I used a can of citrus-based A/C Flush in the evap and condensor, and to get it out, I charged up a small air tank to 90 psi, using my tire compressor. The tank would empty out within a minute, so I had to do this several times. I tried to get all the flush out, but apparently left some liquid behind when I reassembled the system, evacuated it and charged it. The high side pressure went to over 290 psi on a 90F day when I had refilled the system with 70% of the R-12 volume, of R-134a. It cooled acceptably, but not nearly as good as my 93 Daytona's R-134a conversion, with its factory parallel flow condenser (serpentine in the 84).
Anyway, cooling was anemic the other day with 75F ambient and very hot, black leather interior. I don't have a working vent thermometer anymore, but estimate no cooler than 60F air. So I put a pressure gauge on the high side. Engine off, it was 100 psi. Engine running with A/C on, it started at 155 psi and gradually went up to 205 psi, at 75F ambient, with MAX A/C position selected (water valve closing off the heater core).
When I disconnected the gauge, I smelled citrus coming out of the port as the pin closed. There is still an unknown amount of flush in there. I don't have access to a steady supply of compressed air to get it out. Any thoughts on how I could, or whether I should, or whether this is the best I can expect out of the system, even with all flush removed? Does the 205 psi reading at 75F ambient seem full enough, or too high? Advice welcome.
In the process, I removed the compressor and poured out everything, and when bolting it back on, sheared one side of the casting with little effort, while tightening a bolt. Had to buy a reman, as there were no new compressors.
I used a can of citrus-based A/C Flush in the evap and condensor, and to get it out, I charged up a small air tank to 90 psi, using my tire compressor. The tank would empty out within a minute, so I had to do this several times. I tried to get all the flush out, but apparently left some liquid behind when I reassembled the system, evacuated it and charged it. The high side pressure went to over 290 psi on a 90F day when I had refilled the system with 70% of the R-12 volume, of R-134a. It cooled acceptably, but not nearly as good as my 93 Daytona's R-134a conversion, with its factory parallel flow condenser (serpentine in the 84).
Anyway, cooling was anemic the other day with 75F ambient and very hot, black leather interior. I don't have a working vent thermometer anymore, but estimate no cooler than 60F air. So I put a pressure gauge on the high side. Engine off, it was 100 psi. Engine running with A/C on, it started at 155 psi and gradually went up to 205 psi, at 75F ambient, with MAX A/C position selected (water valve closing off the heater core).
When I disconnected the gauge, I smelled citrus coming out of the port as the pin closed. There is still an unknown amount of flush in there. I don't have access to a steady supply of compressed air to get it out. Any thoughts on how I could, or whether I should, or whether this is the best I can expect out of the system, even with all flush removed? Does the 205 psi reading at 75F ambient seem full enough, or too high? Advice welcome.
