Only one speed on A/C fan

1996 BUICK LESABRE
93,000 MILES
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FYBN
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96 buick lasabre 3.8. Only one fan speed on the A/C. Is there a separate high speed circuit that could be at fault or is it in the head unit. If in a circuit where do I find it.
Thanks
Jul 31, 2012 at 5:27 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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