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The source of heat for the system is water/coolant from the radiator circulating through a heater core under the dash. Without the engine running and water circulating, there won't be any heat in the passenger compartment. There is residual heat after turning the engine off, but that won't last long. If the blower fan does not shut off, the resistor has failed.

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14y ago
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Q: 96 grand Cherokee heater work with key off?
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