Yes, the black on black in the desert during summer months has been miserable. I don't know, I do get what you are saying about mass flow, but I still feel that the system could be improved. Actually today was about 106° and this was my first time really putting the r152 to the test since I put it into the system about a week ago and I must say that it did an amazing job. Actually, I'll see how it goes in the next few weeks, but this has probably been the best the system has been since owning the car. I will keep everyone updated. I'm running the r152 with PAG150 oil it's compatible with r134 also.

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1990 190E 3.0L