Sandcruiser "I don't want to adjust the temp in the cab as that just puts engine heat in to fight the cooling and is wasteful. "
I totally agree and wish that someone would find a way to make a variable output compressor that would only work hard enough to get to the temperature that you want instead of hard enough to freeze a Popcicle in Phoenix in August, then diluting that hard worked cold air with hot water from the cooling system.
I just cycle between A/C and vent and try to spend as long as possible in the vent setting to reduce the engine load.
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