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Problem is that the heater core is the highest point in the cooling system. being a closed system any air that enters is trapped in the heater core. Result, no heat.

Recommended repair is to back flush heater core, refill cooling system making sure all air is released from the heater core. Replacement of the radiator cap at the time of repair is recommended.

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Q: Is there a reoccuring problem with the heater core in an 2000 s10 blazer?
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