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Q: heater blows cold on 1997 Chevrolet Tahoe

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
i forgot i also change the heater control valve it worked great for a few days then started blowing cold again
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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