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Why is Defrost windshield blow out hot air?

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YOUR RESEARCHWhy is Defrost windshield blow out hot air?

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POST 1Original post

It was raining, I turned on the "Defrosting the windshield" button B. and there was warm/hot air blow out to the windshield. I tried to make it blow out the cold air by reducing the Temp (61 F). However, it didn't work. How do I change it to cold AC? does anyone has an answer for it? I need to figuer out before Summar comes. one more question, is there a quick way to turn off the AC? other than hold the "Blower speed button" to min, then down one more time? thanks

POST 2Original post

Good question. I guess its just the way they decided to do it. Ditto on all your questions - no other way. Actually this hot defrost kinda sucks IMO. Even in Winter you end up cooking with it on or you have to manually keep turning it on and off. In my 93 Toyota 4x4 I can do it the best way directly to the windshield. Turn the A/C on and the heater at the same time. The hot and cold cancel out. You dont freeze or cook and it defrosts quick and you can leave it on the whole time. The nearest you can get the CS to do this, defrost on, press A/C up arrow, select temp to LO. Its reasonable but very noisey with the fan at full blast. Or just select up arrow with a lesser A/C setting and no defrost. Oh well thats progress.....not. Only 6 posts until post # 987

POST 3Original post

Actually, the key is having the AC compressor ON. It sucks the moisture out of the air and will defrost the quickest. Manually direct the air flow to the windshield and turn the AC on HIGH.

POST 4Original post

This is as good a thread as any to bring this up: I live in a humid climate, and large condensation spots form on the outside of the windshield. The outside temperature in the early morning is already 70+ degrees, so any internal climate control must be at least this high to prevent condensation. Too uncomfortable. In my CS, after much experimentation the only way I can reduce these is to put the fan on very low. No other combination of temperature, vents, AC/NO AC works. Wipers smear things up too much. The unacceptable alternative was to hit the defrost which only blasts hot air. I wish there was a way to defeat the air stream to the windshield, but there doesn't seem to be any setting to do this. This is driving me nuts. Any suggestions?

POST 5Original post

Cold air can't hold moisture as well, so it condenses on your window...warm air holds much more moisture...thus better able to remove from your windshield and suspend it in the air in you car. If it is not humid outside, open your window and vent the moisture laidened air to the outside

POST 6Original post

Thanks, CC. The problem is that the condensation is on the outside of the glass. Cool air (cooler than the outside temperature) blows through the windshield vent and chills the glass slowly until moisture condenses on the outside. True, opening the windows will equalize inside and outside temperatures and prevent fogging, but that lets all the warm muggy air in that I'm trying to avoid. I still can't find a climate control from the inside that will prevent fogging other than periodically blasting the defrost.

POST 7Original post

thanks, I think that is the only way, I read the manual again and was thinking about this.

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