I did 15A work (A/C and electrics) for several years at Ford dealers as a young technician and 34:19 is exactly right. Nice description BTW
Don't worry about wearing out your A/C compressor John, its a metal to metal clutch with no friction material to wear. Just set the temp to a comfortable level and let it do its job. You are just turning the compressor control circuit on and off, so the compressor will just run longer to get the refrigerant to the right pressure again and pressure switch will still cycle the clutch as necessary. "Max A/C" doesn't make the A/C work harder, it just opens the recirculation door to use the cooler cabin air instead of hot outside air (and on some vehicles also run the fan at max).
A small side note: Compressors really, really, hate to start up with a high head pressure. Some old wives tale went around Phoenix when I worked at Sanderson Ford in the 90's that if you bypassed your A/C compressor pressure switch to make it run 100% it would be colder. Nope. The old York piston style and even the Sanden rotaries would blow up pretty quickly. Lots of warranty denials. Even best-case they would just freeze over the evaporator core into a block of frost... no air flow, no cooley-cooley.
{rant}
I can't STAND it when someone gets into a hot car with "auto climate control" and cranks it to 60 degrees. They think they are setting the temp of the air coming out of the vents or something!?! Set it to the damn temp you really want and leave it the Hell alone! It will run FULL BLAST freezing air to get to that comfortable temp and then stay there automatically. Thats the POINT of "auto climate control"....
Or removing the A/C compressor on a factory A/C '70 El Camino to get that ONE more HP?
Or wiring an electric cooling fan to the ignition or a toggle switch instead of using a temp sensor?
:upset:
{rant off}
I'm such a grumpy old man, hahaha
