1994 Chevy Suburban Heater blows cold air

1994 CHEVROLET SUBURBAN
150,000 MILES • V8 • 4WD • AUTOMATIC
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CENGER
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I replaced the radiator on my Suburban during the summer, several months ago. recently, during subzero weather, after the vehicle is warmed up, it will all of a sudden begin blowing cold air. Do I have a duct / door problem or something else?
Jan 22, 2008 at 1:10 PM
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RASMATAZ
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Have you change the thermostat? could also be an air mix/blend door, or actuator and vacuum/hose
Jan 22, 2008 at 1:55 PM