Does your 89CE have a 15 or 17 cc compressor??

Performance on W124 depends heavily on the circulating switch/diaphram being functional. If you're pulling all outside air- performance will be dismal. Make sure you set it to circulate!!!

Check the charge on the site glass. Perfect charge you see just a hint of bubbles when the expansion valve moves, then they disappear(change in pressure). Look at connections for oil and hoses for potential leak points. Unfortunately, the evaporators can be leaky...

These W124's have the old tube/fin evaporators which tend to be poor at conversions to W134a. For any system conversion, you need to have the fan on when ever the compressor is on UNLIKE R12 systems. Factory R134a have 2-speed fans. Some ppl put parrallel flow condensors etc.. lots of work and $$.

M