I switched over to heat a few days ago, now when i try to switch back to a/c it won't do it. I've tested the ac compressor and no voltage is going to it. fueses are good, compressor and clutch are good. I'm assuming there is no way to test the climate control panel, is that most likely the culprit?

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1984 300D Turbo 169k

"Twenty years from now you will be more disappointed by the things you didn't do than by the ones you did. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover."
-----Mark Twain