I took the regular foamy pipe insulation you see on the outdoor aircon pipe and I insulated the aircon pipes in the engine bay (on my tdi300).
They were sweating a lot, meaning giving the low temp to the atmosphere.
This simple improvement gave me 2-3Deg tem drop on the outlet in the cabin. I now run the fan on 1 and if its it really sunny on 2. Mind you I live in Jakarta, its 32-35Deg here every day in the sun.




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