1992 Other GMC Models no heat

1992 GMC
159,000 MILES • 6 CYL • 2WD • AUTOMATIC
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There is no water comming from tail pipe, no water leaks but no heat air blowing fine not over heating
runs well what could it be and where do i start to look for problem
Jan 15, 2010 at 1:39 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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