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bradleyheathhays

Problem w/ intermittent defrost a/c

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Have a '11 Crown Vic with 290k miles and I've been having a problem with the windows fogging up all the way around. The defrost seems to be working about half the time. On humid rainy days it'll work for say a half hour keeping the windows clear, then the windows will fog hard for 10-15 mins. And then it might decide to start working again, back and forth it goes. When I started it just now the compressor clutch turns when the a/c is turned on, although I haven't had a chance to observe it when the windows are fogging.


A secondary problem it has is that it only blows air through the vents on the front of the dash, straight out into the cabin. The air flows only very weak out the defrost vent at the windshield or the floor. It does this on all settings. Although this might contribute somewhat to the problem, it seems like the a/c does completely cut out as the windows will still fog hard with the a/c set to on and on full fan. When it cuts off the air in the cabin feels immediately humid. One that that helps somewhat is to turn the temp toward cooler and it seems to not fog as much and gives it a chance to maybe clear the fog some.


Any idea what's causing this or what I should do to start testing?

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This is quad crazy not crown Victoria crazy! Lol just kidding. It could be two things.  One the fogging could be due to a blown (heater core). It’s a small radiator type coil under dash board on the passenger side. A real bitch to get to.   A tell tale sign is the fogging as well as a wet floor on the passenger side under or on the carpet and a bit of a sweet odor in the car. 

The second thing it could be (less expensive) is the change over valve.  It’s a small valve or damper that’s controlled by the switch in the dash.  The control switch you would use to change to defrost to dash vent.   That switch usually activates a motor of a kind that moves the flaps inside the dashboard ductwork.  That motor can be a pneumatic , electric or cable depending on the year.  It’s usually located on the firewall under the hood. In that general area.  I’m putting my bet on the heater core though based on the fogging.  

Hope this helps.  Get an Atv. It’s a lot easier and more fun to work on! 

Sorry to my fellow members but I couldn’t help myself I love cars as well! 

Good  luck!  

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I would agree with @Frank Angerano , may have a bad heater core or climate control unit. 

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hahahahahaha  lol thats hilarious that he just started posting about his car like a boss on an atv forum

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