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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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βˆ™ 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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It takes more heat to boil water than to simply heat water. Unless the water is already at its boiling point.

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You'd have no heat or air and radiator would boil over causing vehicle damage.

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The hot water is in contact with the metal casing of the radiator, so that metal radiator takes some heat from the water. The heat then passes from the inside metal of radiator to the outside metal of the radiator through convection. The outside metal of the radiator then passes it to the air that is blowing by it outside.

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