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Heater blows cold

(1997 Chevrolet Tahoe)
in Oklahoma City, OK on November 26, 2012
i forgot i also change the heater control valve it worked great for a few days then started blowing cold again
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Popular Answer
on November 26, 2012
check for full of radiator fluid (low fluid = no heat), if full may need new thermostat - you can check the old one by placing in freezer till cold and run under hot water and watch to see if it opens
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