1998 GMC Envoy Can't get heat to work

1998 GMC ENVOY
120 MILES • 6 CYL • 4WD • AUTOMATIC
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DAAP
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few months ago had the fan clutch replaced and now it's blowing cold air again replaced the thermostat and still have cold air blowing. what else could be the problem?
Oct 18, 2008 at 3:17 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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