Heater fan won't blow, it needs a modular. Where can we buy one? on 1993 Cadillac Fleetwood

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The heater is working but won't blow out the heat. My mechanic said it is the modular. We need to know where we can buy one. My car is a 1993 Catholic Fleetwood Brougham.
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Thank you, think I found the part I was looking for and also found a good deal on a A/C Compressor!
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