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If your engine warms up, but you don't get heat from your heater, check your coolant level, if it's low, this would be one explanation

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โˆ™ 2005-11-25 08:22:56
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Q: In your 90 silverado 350 it only blows cool-warm air on high heat maybe the thermostat electronic switch ist opening a valve or a duct door need help thanks?
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