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Old 01-25-2004, 06:51 PM   #1
SubaruImpreza_power
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Location: Greenwich, CT
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1997 Legacy outback
blue

Exclamation HVAC problems!

Why wont my Ac turn on when I have the Defroster on? I have to press the button in order for my windows to not fog up.. and I have the thing set for outside air to come in...

This is on the Forester.. I can't rememember if it did this from the start..
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Old 01-25-2004, 08:24 PM   #2
fredj
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It can't be much warmer in CT this week than NJ. One of the safety fetures built into the AC keeps the compresser from comming on when it is cold eneugh that you would otherwise get a slug of liquid rather than gasious refrigerant back to the compresser and distroy it. Try swiching to 100% outside air to dry off the windows. Heating outside air to the max should make it popcorn dry.
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Old 01-25-2004, 08:54 PM   #3
SubaruImpreza_power
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it did the same thing durning the summer as well.. It sucked when it was Humid out and it started raining..
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Old 01-27-2004, 12:04 PM   #4
Charlie-III
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Silver Sleeper Wagon

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Running on "recirc" is not the best idea when it is humid.
This means even when it is cold out. You have snow on you and the moisture in your breath which condenses on the inside of the windows.

As stated above, use the outside air setting.

Also, when the car is really cold, it probably disables the AC compressor until the coolant temp comes up to prevent stalling from the extra load.

Oh. Using "recirc" does not hurt anything, it is just not very efficient.
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Old 01-27-2004, 01:12 PM   #5
SubaruImpreza_power
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Yeah but it does not turn on Period when I turn on the front window Defrost
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Old 01-28-2004, 02:36 PM   #6
bigpaulo
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Default make sure your AC is working...

My AC died this past summer, had it fixed under warranty (new expansion valve needed, plus some O-rings). So check that your AC is working at all (just what you want, crank the AC in the dead of winter!) But that should tell you if the AC is completely out, and not just the defogger part of it.
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Old 01-29-2004, 12:28 AM   #7
SubaruImpreza_power
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durning the summer it would cycle on and off every 5 seconds.. which was shorter then when I first got the car.
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