Defrosting Windows - Toyota Yaris Forums

YarisOwnersDad · 12-22-2009, 11:39 AM

This may be "old news" to most folks around here, but there is a TREMENDOUS increase in the effectiveness of the defroster when the fresh air selector knob is set for vent rather than for recirculation.

I guess that should be expected, since you will be bringing in dryer air from outside when in "vent" mode, instead of recirculating the air inside the cabin, which is being constantly humidified by your breathing.

I guess the Yaris is a lot more air tight than any other car I have ever owned, because I am sixty years old and have been driving since I was sixteen, but I don't remember ever having to use the vent mode for good defrosting with any of the other cars that I have owned.

Tom

b_hickman11 · 12-22-2009, 12:08 PM

Doesn't it tell you to use the method on the AC control knobs?

RedRide · 12-22-2009, 12:46 PM

Yes it does.

YarisOwnersDad · 12-22-2009, 01:41 PM

Well, yeah, but who follows directions?

Actually, I had never paid any attention to the "fine print" on the knob. I knew that the last two or three positions to the right (clockwise) were for defrost, but I had not noticed that there were instructions to use the vent mode. Like I said, I have never had to do that with any of my previous cars.

Old people! What are you gonna do with us?

Tom

Yaris Hilton · 12-22-2009, 02:14 PM

Well, yeah, but I've never used recirculating mode with defrost or heat, ever, because it seemed pretty obvious that it would trap moist air in the car.

YarisOwnersDad · 12-22-2009, 03:20 PM

Quote:

Originally Posted by Yaris Hilton

Well, yeah, but I've never used recirculating mode with defrost or heat, ever, because it seemed pretty obvious that it would trap moist air in the car.

Well, you are smarter than I am, but that isn't saying much.

Yaris Hilton · 12-22-2009, 03:51 PM

LOL!

mdesjarlais · 12-22-2009, 09:55 PM

When you use the defrost you are actually pulling air throught the a/c evaporator, as it will dry the air when it circulates through the system. If you cycle it through via inside air as opposed to the fresh air selector, if I remeber correctly from climate control classes, it won't cycle through the evaporator.

YarisOwnersDad · 12-22-2009, 10:20 PM

Well, for whatever reason, it sure makes a world of difference to be in the vent mode.

Tomster

AlexNet0 · 12-22-2009, 10:20 PM

I actually dont think Ive ever used the recirc other than for AC

BailOut · 12-23-2009, 12:40 AM

I've never even used the defroster. I live in a drier area so I just crack a side window and let sublimation do all the work.

YarisSedan · 12-23-2009, 01:28 AM

Yeah I always leave the passanger side window just open a tiny bit. First defrost and then open window slightly and keeps it from refogging. I have noticed my windows fog up lot easier than other cars ive driven. Could be like you said the smaller volume of air space inside since it is a subcompact.

specialeducator · 12-23-2009, 09:11 AM

Quote:

Originally Posted by YarisSedan

Yeah I always leave the passanger side window just open a tiny bit. First defrost and then open window slightly and keeps it from refogging. I have noticed my windows fog up lot easier than other cars ive driven. Could be like you said the smaller volume of air space inside since it is a subcompact.

I think it's the lack of wind leaks

YarisOwnersDad · 12-23-2009, 10:12 AM

I do too, SpecialEducator.

I have owned all kinds of cars and pickup trucks (talk about a small cabin area), and I have never paid any attention to whether or not the controller was set for vent or recirc.

Tomster

Sidicas · 12-27-2009, 11:05 PM

Quote:

Originally Posted by specialeducator

I think it's the lack of wind leaks

Agreed..

It hasn't been mentioned yet, so I'll point it out.. The recirculate will heat up your car much faster.

Instead of constantly bringing in and heating up freezing cold air from the outside, it will just keep heating up the air inside the vehicle..

When nobody is in the car and you're trying to warm it up as quickly as possible, recirculate is the way to do it! Works great!

12-22-2009, 11:39 AM	#1
YarisOwnersDad Is now a Corolla S Owner View User's Garage Drives: 2010 Corolla S Join Date: Mar 2009 Location: Western Kentucky Posts: 460	Defrosting Windows This may be "old news" to most folks around here, but there is a TREMENDOUS increase in the effectiveness of the defroster when the fresh air selector knob is set for vent rather than for recirculation. I guess that should be expected, since you will be bringing in dryer air from outside when in "vent" mode, instead of recirculating the air inside the cabin, which is being constantly humidified by your breathing. I guess the Yaris is a lot more air tight than any other car I have ever owned, because I am sixty years old and have been driving since I was sixteen, but I don't remember ever having to use the vent mode for good defrosting with any of the other cars that I have owned. Tom

12-22-2009, 10:20 PM	#10
AlexNet0 View User's Garage Drives: '07 Yaris 3dr Join Date: Nov 2008 Location: Rockland, ME Posts: 1,638	I actually dont think Ive ever used the recirc other than for AC __________________ ---------- MI-YW ----------

12-23-2009, 12:40 AM	#11
BailOut Steals terrorist's lunch View User's Garage Drives: 2007 Yaris Liftback Join Date: Mar 2007 Location: Reno, Nevada, USA Posts: 1,299	I've never even used the defroster. I live in a drier area so I just crack a side window and let sublimation do all the work. __________________ - Brian Share the Road I often carry 2 carpool passengers and mountain bikes or snowboards/skis over a 4,500 foot elevation difference. Click the graphic above to see my detailed mileage logs.

12-23-2009, 01:28 AM	#12
YarisSedan Drives: 08 Yaris Sedan Join Date: Oct 2008 Location: California - Bay Area Posts: 2,773	Yeah I always leave the passanger side window just open a tiny bit. First defrost and then open window slightly and keeps it from refogging. I have noticed my windows fog up lot easier than other cars ive driven. Could be like you said the smaller volume of air space inside since it is a subcompact. __________________ http://www.cardomain.com/ride/3210549

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12-22-2009, 12:08 PM	#2
b_hickman11 Drives: 08 Sedan Join Date: Oct 2008 Location: Tyler, TX Posts: 899	Doesn't it tell you to use the method on the AC control knobs?

12-22-2009, 12:46 PM	#3
RedRide Drives: '09 Yaris carmine red 2d HB Join Date: Jun 2009 Location: Middletown, NY Posts: 1,501	Yes it does.

12-22-2009, 01:41 PM	#4
YarisOwnersDad Is now a Corolla S Owner View User's Garage Drives: 2010 Corolla S Join Date: Mar 2009 Location: Western Kentucky Posts: 460	Well, yeah, but who follows directions? Actually, I had never paid any attention to the "fine print" on the knob. I knew that the last two or three positions to the right (clockwise) were for defrost, but I had not noticed that there were instructions to use the vent mode. Like I said, I have never had to do that with any of my previous cars. Old people! What are you gonna do with us? Tom

12-22-2009, 02:14 PM	#5
Yaris Hilton Half a Bubble Off Plumb Drives: 2009 Yaris Sedan Join Date: Mar 2009 Location: Bristol, Tennessee, USA Posts: 1,593	Well, yeah, but I've never used recirculating mode with defrost or heat, ever, because it seemed pretty obvious that it would trap moist air in the car.

12-22-2009, 03:51 PM	#7
Yaris Hilton Half a Bubble Off Plumb Drives: 2009 Yaris Sedan Join Date: Mar 2009 Location: Bristol, Tennessee, USA Posts: 1,593	LOL!

12-22-2009, 09:55 PM	#8
mdesjarlais yarisnoob Drives: 2009 yaris hatch Join Date: Dec 2009 Location: rhode island Posts: 5	When you use the defrost you are actually pulling air throught the a/c evaporator, as it will dry the air when it circulates through the system. If you cycle it through via inside air as opposed to the fresh air selector, if I remeber correctly from climate control classes, it won't cycle through the evaporator.

12-23-2009, 10:12 AM	#14
YarisOwnersDad Is now a Corolla S Owner View User's Garage Drives: 2010 Corolla S Join Date: Mar 2009 Location: Western Kentucky Posts: 460	I do too, SpecialEducator. I have owned all kinds of cars and pickup trucks (talk about a small cabin area), and I have never paid any attention to whether or not the controller was set for vent or recirc. Tomster