defroster fogs windows

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  #1  
Old 11-28-03, 09:50 AM
b0bberdown
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defroster fogs windows

hello, the defroster on my fathers grand marquis seems to fog the windows. this just started. the fan works fine, but as the engine warms the condensation seems to get worse. anyone have any ideas? thanks, bob
 
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  #2  
Old 11-28-03, 10:03 AM
comtnman's Avatar
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Thumbs down

Not what you want to hear, but the heater core is leaking. Look on the floor on the passenger side for antifreeze, not always will it be visible on the floor.
 
  #3  
Old 11-28-03, 10:04 AM
Join Date: Jun 2002
Location: Long Island, NY
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Hi,

You didn't state the year or mileage... could be leaking heater core?
 
  #4  
Old 11-28-03, 10:08 AM
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You could have a possible leaky heater core. Antifreeze in the heater box will make the windshield fog when it gets warm.
Can you smell antifreeze when the heat is running?
Billy
 
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Old 11-28-03, 10:11 AM
b0bberdown
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thanks for your help. about how much to get replaced.
 
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Old 11-28-03, 10:17 AM
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WOW... thats awesome..... 3 of us post the exact same thing at the exact same time. LOL.
Billy
 
  #7  
Old 11-28-03, 10:48 AM
otter_
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fog

your a/c may have failed. A/c is supposed to cycle when defrost is selected, as a/c acts as a dehumidifier. Most late model domestics (not sure about imports) will force the a/c with defrost down to about -10 celsius. Air loses its capacity to hold moisture at lower temperatures, that's why your a/c won't come on with defrost when it's -30 out.

A good way to check this is to turn your blower on and move your air selector to defrost -- check under the hood of the car and see if your air conditioning compressor is cycling.


I am making the assumption that what you describe happens on damp days and you don't smell coolant.
 
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