I've owned the car since 2012. I did the R-12 to R134a conversion and I've never used R-134a with any leak sealer. I've also used ester when I did the conversion or any subsequent maintenance.

Summer is coming. I have a 1991 Accord Aerodeck LX with factory A/C. One of my A/C lines is plugged and I'd like to know if it's more common for the high pressure or low pressure lines to be plugged. The condenser is relatively new (aftermarket Autozone). The expansion valve is also an Autozone part...