Now that the summer heat has arrived throughout the USA, I thought I'd ask you folks about the temperature readings you've been obtaining (if you've been measuring ) from the A/C vents in your Mercedes-Benz diesels.

I noticed that whenever I get to a stop light the temperature of the air from the vents started going up. It's as if the compressor stops running or something.

The best temperature readings I got were as follows:

Outside Temperature : 93F
Temperature of air from vents : 51.9F
Humidity outside : 70%
Engine rpm : 2500

All this from my 1984 Mercedes-Benz 300SD. After I got the car I had it converted to R134a as the A/C wasn't blowing out cold air. Little did I know that I had a major leak. Eventually my A/C expert found out that the compressor was just leaking like no man's business. So I just replaced the compressor and clutch and accumulator drier with brand new ones. Wanted to replace the expansion valve but looks like the engineers at Daimler-Benz stupidly put it up in the dash, so we didn't bother to replace it.

So what have you all been getting? Please specify R12 or R134a.