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Old 07-17-2019, 06:48 PM   #11
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Rear defrost hasn't worked in a long while, front defrost is still needed
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Old 07-17-2019, 06:59 PM   #12
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Rear defrost hasn't worked in a long while, front defrost is still needed
You need the AC compressor for front defrost to work properly.

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Old 07-19-2019, 06:22 PM   #13
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Need AC for the defroster to work???????????

My 2012 Ti has a dedicated button to turn the AC on or off independently of any other setting. I live in MN and have never had the AC on in the winter and defroster works just fine with heat only.
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Old 07-19-2019, 07:53 PM   #14
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Need AC for the defroster to work???????????

My 2012 Ti has a dedicated button to turn the AC on or off independently of any other setting. I live in MN and have never had the AC on in the winter and defroster works just fine with heat only.
When you turn your defrost on believe it or not your AC compressor also turns on. Your AC compressor turns on to help dry out the air.

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Old 07-20-2019, 06:00 PM   #15
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Originally Posted by zacautomotive View Post
When you turn your defrost on believe it or not your AC compressor also turns on. Your AC compressor turns on to help dry out the air.

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It helps in humid climates, but is not necessary.

In the south it sure helps on the sticky humid mornings. (this is not "Frost" though)

In the North you are blasting full heat because its cold AF and you have Ice/Frost on the window
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Old 07-20-2019, 06:24 PM   #16
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It helps in humid climates, but is not necessary.



In the south it sure helps on the sticky humid mornings. (this is not "Frost" though)



In the North you are blasting full heat because its cold AF and you have Ice/Frost on the window
I live in North Carolina and defrost without having a working AC compressor good luck. It acts as a dehumidifier. We get freezing rain and snow here as well. Fog is the issue. Manufacturers design the AC compressor to turn on when the defrost is on for a reason.

Simply agree to disagree.

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Old 07-20-2019, 07:38 PM   #17
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Originally Posted by zacautomotive View Post
I live in North Carolina and defrost without having a working AC compressor good luck. It acts as a dehumidifier. We get freezing rain and snow here as well. Fog is the issue. Manufacturers design the AC compressor to turn on when the defrost is on for a reason.

Simply agree to disagree.

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Sooooo, we agree it helps in a humid climate.......

A little cold here in the south isn't like the dry cold up north. Moisture on the inside is not the issue when you have ice on the window. AC wont make a difference in the Northern Winters
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Old 07-20-2019, 07:53 PM   #18
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Sooooo, we agree it helps in a humid climate.......



A little cold here in the south isn't like the dry cold up north. Moisture on the inside is not the issue when you have ice on the window. AC wont make a difference in the Northern Winters
I understand what you're saying about the ice. Minnesota for instance when it's not cold it can be extremely humid so you would want a working AC compressor.
All I'm trying to say is the AC compressor plays a role in the defrost. I'm not talkin about hard ice or snow, but the fog that prevents you from seeing.

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Old 07-22-2019, 09:47 AM   #19
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Quote:
Originally Posted by DirtyDave View Post
Sooooo, we agree it helps in a humid climate.......

A little cold here in the south isn't like the dry cold up north. Moisture on the inside is not the issue when you have ice on the window. AC wont make a difference in the Northern Winters
Ever lightly blow on a frozen window with your breath and see it fog up? That's the same issue that requires the air compressor to dehumidify the air.
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Old 07-22-2019, 09:51 AM   #20
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Again, I'm not saying the AC doesn't help. I'm just saying you can still defrost without it.
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