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1990 740 GL Sedan automatic, no operator-controlled temperature setting on the air conditioning.
There are many times in stinky Los Angeles when I want interior air, but I don't want the air conditioner on. I wish my Volvo had a A/C on-off switch. With the A/C off, I could move the vent sliders to Max A/C to get recycled air without activating the A/C system.
I'd like to install a switch on the dash that defeats/allows the A/C system, regardless of the setting of the vent control sliders. Ideally, I would intercept one wire in the dash, wiring it to a simple on-off switch. Could it really be this simple? If so, which wire? Also, is the any chance of damaging any A/C system components when using such a switch? Thanks!
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