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Three possibilities: 1. The heater is plugged with rust. 2. The radiator cap is not maintaining adequate pressure in the system. Raising the pressure prevents boiling. Rad caps contain springs that weaken with use. 3. The coolant contains too little antifreeze (too much water) and the thermostat is stuck open. Flush the system, replace the thermostat and rad cap and refill the system with 70% propylene glycol and 30% water. (Not ethylene glycol - when it spills it poisons animals.) If the problem persists replace the heater core.

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โˆ™ 2004-11-17 02:36:48
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Q: Why would water boil out of radiator yet the car does not heat up?
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