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A bad Heater Core------ IF U use Anti-freeze in your Radiator - U should smell it. also U should have water on the passenger side of the vehicle-INSIDE or outside.even under the carpet. Sounds like you have a leaky heater core, This Usually will cause the windows steam up. And is quite an involved job to replace core.

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โˆ™ 2004-12-04 12:15:35
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Q: What causes steam to come into the cabin of a 1990 Mercury Grand Marquis through the air vents and the heater doesn't work?
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