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    chsims321's Avatar
    chsims321 Posts: 1, Reputation: 1
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    #1

    Jan 10, 2010, 11:34 AM
    2000 Silverado heater will not get hot
    Heater will not get warm when you cut it on
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #2

    Jan 10, 2010, 01:58 PM

    Reverse flush the cooling system, including the heater core. Corrosion or phosphate scale may be blocking passages. Refill with a 50/50 mixture of recommended antifreeze and distilled water. This link may give you a new perspective on cooling system maintenance:

    https://www.askmehelpdesk.com/cars-t...tml#post235973
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