Originally Posted By: larry818
Given this new info, do you still think you need a kill switch?


Yes. Like most other vehicles of this era, the car automatically turns on A/C whenever I direct internal air flow at the inside of the windshield. On most of the planet, this is an okay idea.

In Canada, in winter, at -20C, it is a very bad idea. We need hot air directed at the windscreen to melt the friggin ice, snow, and freezing rain while driving. If the A/C is cooling that heated air by 5-10C, then the system cannot keep up with ice accumulation, and visibility suffers.

Having A/C on in the dead of winter gives another problem too: damp air in the ventilation system after A/C has been on and the ice it created has melted. Next time one starts the car, this damp air blows onto the windshield and instantly freezes, icing up the inside of the window. Which then requires running the A/C to get rid of it, thus perpetuating the cycle. smile