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post #1 of 12 (permalink) Old 01-01-2008, 06:24 PM Thread Starter
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Default interior fogging

07 interior fogging on all interior glass seems to be much worse than on my old 04 prius anytime the weather is cold and humid which puzzles me. If its really humid still have interior fog after 15 miles and need to keep rear window heat strips on. AC seemed fine in hot weather. This is not fixed by changing to recirculation or exterior air flow. Is this something I need to get used to or am I missing something??? [ new england CT/RI area ].
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post #2 of 12 (permalink) Old 01-01-2008, 06:34 PM
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Default Re: interior fogging

Works fine on my 07.

Turn on your defroster.
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post #3 of 12 (permalink) Old 01-01-2008, 06:37 PM Thread Starter
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Default Re: interior fogging

Im talking with the defroster on. [never tried turning it off to solve the problem. that thought had not occurred to me.]
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post #4 of 12 (permalink) Old 01-01-2008, 06:42 PM
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Default Re: interior fogging

Do you have "Auto A/C" selected and the ac compressor 'on' as shown on the soft button on the Climate screen? If you leave the compressor on all of the time, it will properly condition the air to reduce fogging. It does not mean that the compressor is running continuously. It means that it can run when needed to reduce humidity.
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post #5 of 12 (permalink) Old 01-01-2008, 07:33 PM Thread Starter
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Default Re: interior fogging

The AC is on according to the climate panel, also front and rear defrost. Results suggest rhe AC is not running
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post #6 of 12 (permalink) Old 01-02-2008, 07:49 AM
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Default Re: interior fogging

Try turning off the front defroster. When it's on you don't have auto A/C. Even in auto A/C some air flow is directed on the windshield and should keep it clear of fog. What temperature setting are you using? I find 71 or 72 to be the most effective and comfortable for me. I hardly ever need the front defroster, but do use the rear defroster occasionally.
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post #7 of 12 (permalink) Old 01-02-2008, 03:52 PM
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Default Re: interior fogging

I've seen this starting on my '04 in the past few weeks, too. It seems as if my A/C compressor has died, as even making certain it is on, it still takes forever to defog. It used to defog significantly faster.

Owner of 'Eeyore', a 2004 Prius. Only took 2 days from start of search to delivery.

8 years of ownership, 115,000 miles, about 40 MPG average at present.
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post #8 of 12 (permalink) Old 01-04-2008, 03:32 PM
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Default Re: interior fogging

Quote:
Originally Posted by firepa63
Try turning off the front defroster. When it's on you don't have auto A/C. Even in auto A/C some air flow is directed on the windshield and should keep it clear of fog. What temperature setting are you using? I find 71 or 72 to be the most effective and comfortable for me. I hardly ever need the front defroster, but do use the rear defroster occasionally.
It is my understanding that the compressor does come on 100% of the time while in defrost mode. This has been true in any car that I have owned.
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post #9 of 12 (permalink) Old 01-04-2008, 03:50 PM
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Default Re: interior fogging

Quote:
Originally Posted by redwein
It is my understanding that the compressor does come on 100% of the time while in defrost mode. This has been true in any car that I have owned.
You are correct. The point I was trying to make is that in auto A/C you will have conditioned air throughout the car. This dehumidified air should keep the windshield clear, especially since a small amount of air flow is constantly directed on the windshield. The other possibility the OP may be experiencing is low refrigerant in the system.
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post #10 of 12 (permalink) Old 01-04-2008, 04:10 PM
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Default Re: interior fogging

I see what you are saying now and I agree. For defogging "all" of the windows, defrost is probably not the best choice. If they aren't using defrost then it does sound like something is wrong with the A/C compressor/system.
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