Air Conditioning and Coolant
Heater Cores and Blower Fans
VW Jetta

Why is coolant steam coming from the heater vents in a 91 Jetta?

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2005-10-20 01:05:57
2005-10-20 01:05:57

your heater core is leaking. this is located most the time under the dash. you will have to have it replaced

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Those "fumes" are more than likely coolant steam coming from a leaky heater core. Replacing the heater core is your best option.

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I assume you mean smoke and water are coming from the A/C vents. I suspect you are seeing steam and coolant. You probably have a heater core leaking.I assume you mean smoke and water are coming from the A/C vents. I suspect you are seeing steam and coolant. You probably have a heater core leaking.

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That "mist" is more than likely coolant steam coming from a leaky heater core. Replacing the heater core is your best option.

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replace the heater core, it most likely has a busted tube making the water heat and turn into steam whenever the heater or defroster is on. you may want to check the coolant level. after so long of the steam, or super heated water, escaping into the air duct system. you will obviously lose coolant level.

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Those "fumes" are more than likely coolant steam coming from a leaky heater core. Replacing the heater core is your best option.

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The heater core is leaking coolant.

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The heater core is leaking coolant.

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It means you have a leaky heater core. You may also find the front passenger floor wet with engine coolant.

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Sounds like your heater core has a leak and is causing steam to enter your air ducts. Does the steam have a coolant oder, if so, you will have to pull it and replace.

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heater core needs replacement

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You may wish to check the heater core if the steam is on the inside of the windshield. If on the outside, you may wish to check your heater hoses and coolant system for a leak Tom Brode

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usually you will get antifreeze smell and steam inside coming from defrost

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You might have a small leak in your heater core, had that problem with my 96 Jetta. Had to replace it.

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usually bad odor, steam or fog on windshield and residue of coolant in floorboard of vehicle

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Front heater core is in the dash, the rear heater core is all the way in the back of the vehicle. If you have steam coming out of the dash vents, the front HC is leaking. If you have steam coming out of the rear heater vents, then the rear core is leaking.

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The problem has been resolved. The problem was a blocked A/C drain coming from the heater box. Not allowing the condensation formed from the A/C system to not drain out causing the steam from the water hitting the hot heater core upon braking or a left turn.

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Heating hoses are exposed and need to be replaced. The heater core is leaking coolant.

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Essentially, it means you are screwed. Shouldn't have bought a jeep.

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It is probably steam coming from a leaky heater core.

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The smoke you see may be moisture/steam. The heater core is probably leaking engine coolant. If the "smoke" has a sweet smell to it, it's engine coolant. More info about the vehicle such as model and year would help.

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Engine oil mixing with coolant and/or coolant mixing with engine oil.Losing coolant but don't see any leaks. White smoke (steam) coming out the exhaust that has a sweet smell to it.

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


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