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I have a 1999 expedition and when i turn on the heat it blows smoak/fog and it smells like burnt coolant.. what do you think is wrong

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Sounds like you will need to replace the heater core as it's leaking antifreeze inside the vehicle. Check the floor on the passenger side for dampness.

Posted on Apr 02, 2011

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Sounds like coolant leaking into the sump/inlet. Usually caused by a failed head gasket.

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Fogging up your interiors windsheild? The smell of coolant in your vehicle?


If your windsheild starts to steam up while driving your heater core has a leak causing this. Also you may receive the smell of burnt coolant before the fog starts activating. Best thing to do it get it repaired asap. Your coolant level will go down everyday you keep driving this way. The smell will get you sick to your stomach as well

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Why do i smell coolant and my windows fog up in myy '99 Expedition?


You sound like you have coolant leaking via your heater core inside the vehicle.

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While driving my 95 explorer i noticed the heater wasnt getting hot its luke warm and when i turn on the defroster i start to smell anti freeze and all of the windows fog up


no heat is probably low coolant or bad thermostat,although you have fog and smell ! the heating and cooling systems are closed systems the only way the windows fog is the coolant is hot and steams inside the car due to some leak inside the heater core box. as well as the smell being present. Now it is possible that a little leak has occured where the coolant supply or return line connects to the heater core and is running into the car which is running onto the core and creating steam and smell. hopefully it is a easy clamp tighten fix for you.

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Truck is blowing vapors out of heating vents...fogs inside of truck


This is usually a sign of a heater core that has a leak. check for low coolant level in your radiator. there is a condensate drain for the blower box, see if coolant is dripping from the drain under the truck. To make a temporary repair, after confirming leaking heater core, loop one of the heater core hoses back to the engine, bypassing the heater core. I say after confirming because the heater core hose nipples break easily when removing hoses. The smell in the cab would be a sweet smell from leaking coolant.

On a very humid day fog can be seen coming out of vents when using the AC. This would be a normal condition.

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Sounds like you have a blown headgasket,check the coolant in the radiator and if you find oil in it you do need a headgasket.

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suspect leaking heater core.check coolant level.

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the heater core inside the dash is leaking, it may get worse and coolant will start to drip on the floor out of the heating outlet

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