1997 GMC C1500 noheat and wipers only work on high

1997 GMC C1500
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444LLL
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Heater problem
1997 GMC C1500 6 cyl Two Wheel Drive Manual

i have a 97 GMC 1500 and nothing happens when i turn on the heat or defrost i turned it on one day and smoke came out and now nothing at all and my wipers will only work in the on position
May 6, 2010 at 10:11 AM
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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