Date registered: May 2013
Vehicle: 1961 190SL
Location: Northern California, USA
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"One option not mentioned here is what I call 'de-rating' the York. That is fitting a larger compressor clutch-pulley so the engine doesn't work as hard.
Many years ago, I did that on a '67 Ford Mustang that had an aftermarket Sears hang-on AC with a failed compressor-clutch. Result was less power loss with the AC on and a cooler running engine. Downside was a slight loss of AC-cooling when idling."
I did the same thing on my '71 Dodge van decades ago. I went to the self serve auto wrecking yard and got some pulleys then cut them up on my lathe and recombined the pieces. The crankshaft pulley was made smaller and the water pump pulley was made larger to slow down the RPM of all the accessories.
That lightens the load on the engine. The only difference I noted in the AC is that I can hear it "chugging" at idle as each compression stroke pulses freon into the condenser. The engine runs as cool as ever so there is no loss of cooling in any situation, idling to highway hauling. Spinning things like the AC compressor, water pump and alternator slower has to lengthen their lives.