Quote:
Originally Posted by m5james
Just like low speed limits...this is mostly for older cars that were less efficient. Modern systems nowadays have better clutches that'll disconnect as needed and run a different refrigerant. I just rounded over 100k in my '10 X5M and topped of my A.C. after noticing it wasn't as cold as I'd prefer in CA's 90*+ temps vs WA's 60* averages...$34 later and it's ice cold
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Yes, small 4-cylinder engine with an old, inefficient compressor, A/C might hurt performance, but in any modern car they have a good systems. But switching off the a/c reduces the extra load on the engine to run the a/c compressor.