Heating AC and Engine Cooling
Heater Cores and Blower Fans
Ford F-150
Car Heaters

Why would hot steam blow from the heater vents?

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Wiki User
2005-01-06 11:40:07
2005-01-06 11:40:07

Leak in heater core. Replace core.

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Sounds like your heater core has a leak and the sweet smell is your coolant.

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The heater coil probably has a leak causing steam and vaporized antifreeze to be released into the vents. Is it using coolant?

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Any of the following can cause this......... 1. Bad a/c - heater controller.. 2. Bad a/c - heater controller inside door operation.. 3. Bad, broken or cracked vacuum line/lines..

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heater on at idle and will not blow warm air. when moving it blows the warm air from the vents. what will cause this

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most likely it's a bad thermostat, or your vents not working properly.

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Check the following.......... 1. Vacuum leak, broken vacuum line or disconnected vacuum line. 2. A/C - heater inside car door operation.. 3. A/C - heater controller..

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I don't know why the vent would not open for the defrost, but it may be related to the fact that your heater core is blown. If your getting nothing but cold air out of the vents when the heat is on, your core is finished and if the core is finished then it is likely related to your vent not opening/switching. Something''s wrong with your heating either way.

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You have a broken vacuum hose under the hood that supplies the switch.

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It should blow through the floor vents. Modern vehicles generally use movable baffles in there HVAC systems, to direct air flow where the controls indicate. If the controls allow airflow to the floor, but nothing flows out, there is a malfunction between the control switch and the actuator that directs the flow.

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Vent bypasses heater core when open,it is for outside air only...I know this because I just replaced heater core.

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The flap that directs sir to the selected vents is jammed or broken...or the switch that controls it is.

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somtimes a mouse moves into the blower motor and makes a nest ?

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Yes. The heater core provides the heat which blows out your vents. The heater core has engine coolant flowing through it (it is like a mini radiator) which creates the heat which warms the air that comes out your vents. If you have low coolant, there may be no coolant circulating through heater core, thus causing cold air to blow out vents.

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Sounds like you have the beginnings of an a/c vacuum leak. Our Expedition did the same thing and eventually it defaulted to blowing out of only the heater vents, which is the default when things aren't routing properly.

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If we are talking rain water not engine coolant I would suspect the drains under the cowl are plugged up with debris (leaves and such). If it is engine coolant then I would suspect the heater core is leaking.

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This means that you have either an issue with a vacuum line or one of the a/c - heater doors behind the dash is not working correctly and you need to start off at the a/c - heater controller to check that all positions are working...........

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Either you need to pen your vents or there is some vent obstruction.

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Bad selector? vacuum leak at engine or vacuum motors under dash

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heater core possibly plugged and leaking

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