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Re: 1999 C1500 Suburban Front Heater
This model doesn't a heater control valve. Sounds like the core might be restricted/stopped up. Have you tried back flushing the heater core? If not, remove both heater hoses at the firewall and use a garden hose to flush the core both directions. See if you get any flow or trash out of it.
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I know the "VOICES" aren't real but they have some great ideas.
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