RepairPal Certified shops can diagnose and repair your 2001 GMC Sierra 1500. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
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Does it have a sweet smell like coolant? That could be the heater core leaking. If it smells like regular water, it could be your heater box drains are plugged and the water is overflowing from the heater box. Your windshield seal is in good condition?