A higher powered (cfm) will make enough difference. I recently fixed my 89 300e and used basically all stock parts. A proper running r12 system is surprisingly better than one would think. We had a few high 90* days in Cleveland, with humidity to boot, and I felt that my ac was way more than just "barely adequate". I found myself setting the fan to a lower speed usually.

Window tint would be a great upgrade as well

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Eugene

10 E63 AMG
93 300te 4matic
07 BMW X3
14 Ford F-150 Fx2