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GENUINE BUICK ROADMASTER 1991-1993 AC HEATER CLIMATE CONTROL 16157334 (via ebay)
Found this part for my '93 Limited. I found it easiest to locate by "Buick Climate Control 16157334", the number is the model number. There are a couple variations of this part, and i could not find by all my normal means, so thanks to the ebay pickers. Most of the prices I've seen are $85-$120, but i saw that the completed sales were all a bit lower. I found a 'make offer' sale with free shipping and got one for $65. This part solved a bunch of crazy behavior with my climate control, caused by an intermittent short in the circuit board.