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Car Forum / Toyota / Toyota Cars / February 2007A/C light
2005 corolla, A/C light does not come on in defrost mode. My Trooper does in both defrost and floor/defrost. Is this normal? Ron "ronbon" ... > 2005 corolla, A/C light does not come on in defrost mode. My Trooper > does in both defrost and floor/defrost. Is this normal? > Ron Whoa - why would you need to defrost with the A/C on? Mebbe I'm missing something. Natalie > "ronbon" ... >> 2005 corolla, A/C light does not come on in defrost mode. My Trooper [quoted text clipped - 6 lines] > > Natalie When turning on the defroster it helps if the A/C is turned on. The A/C helps take the moisture out of the air that is blowing on the window. >> "ronbon" ... >>> 2005 corolla, A/C light does not come on in defrost mode. My Trooper [quoted text clipped - 8 lines] > When turning on the defroster it helps if the A/C is turned on. The A/C > helps take the moisture out of the air that is blowing on the window. Almost all cars since 1999 have the AC running when the defroster is on. I think it's a damn nuisance...if I want the AC on, *I'LL* turn it on! "Hachiroku ????" Ralph Mowery wrote: >> "Wickeddoll®" ... >>> [quoted text clipped - 13 lines] > Almost all cars since 1999 have the AC running when the defroster is on. I > think it's a damn nuisance...if I want the AC on, *I'LL* turn it on! Well, my A/C light has never come on with the defroster. Not in any car, not even hubby's new(er) Scion. Natalie "Ralph Mowery" ... > "Wickeddoll®"... >> [quoted text clipped - 10 lines] > When turning on the defroster it helps if the A/C is turned on. The A/C > helps take the moisture out of the air that is blowing on the window. And it doesn't interfere with the temperature? Weird. I didn't think the A/C would even function with the A/C on. Interesting. Natalie > "Ralph Mowery" ... >> [quoted text clipped - 19 lines] > > Natalie It may be the way to help car owners that don't know how to use the defroster function. You normally should have the A/C turned on, the heater control set up for heat and the outside air/recirculate set to bring in fresh air from the outside. Many people don't know that the A/C only puts out one temperature (coolness) and the heat control just puts hot water from the radiator/engine cooling system into the heater to help control the temperature. The A/C will cycle the compressor off and on also to control the temperature. The AC being on in defrost helps dehumidify the inside. In any of the cars I've had the AC light doesn't come on but you can hear it "cycle". Ron in Ca > "Ralph Mowery" ... >> [quoted text clipped - 19 lines] > > Natalie > "ronbon" ... >> 2005 corolla, A/C light does not come on in defrost mode. My Trooper [quoted text clipped - 6 lines] > > Natalie Sometimes, the defroster alone can't deal with the humidity INSIDE the car, from multiple passengers, and moisture evaporating from wet foot mats. You've probably seen fools driving down the road with all windows fogged up. Turning on the A/C produces dry air to help with the problem. In some cars, the A/C comes on automatically when you use the defroster. In others, you have a choice. By the way, A/C does not mean "cold". When defrosting, you turn the temp selector to warm. Now, you have dry heat, and it works in the same way forced air heat helps clear the fog out of the bathroom during a shower. All cars should offer a choice of using it or not. For half the year, I find I don't need it. Why affect mpg by using the A/C when it's not needed? "JoeSpareBedroom"... > "Wickeddoll®" ... >> [quoted text clipped - 22 lines] > find I don't need it. Why affect mpg by using the A/C when it's not > needed? Wish I'd known this back when we lived in subzero Colebrook, NH. I'm one of those fools with fogged windows. Never knew this little factoid. :-P Natalie > "JoeSpareBedroom"... >> "Wickeddoll®" ... [quoted text clipped - 30 lines] > > Natalie Back in the 1970s, the NY commissioner of motor vehicles was Vincent Toffany. I guess his speech patterns made him seem like sort of a meat head, because a local radio station ran these silly public service commercials which were apparently based on the station manager's observations of lousy drivers, and how the commissioner would address them. "This is Vincent L. Toffeecandy from the NYDMV. It's winter, ya know? Keep youse damn windows clean, and for god's sake, watch where the hell you're goin'!" On Feb 16, 11:33 pm, "Wickeddoll®" <wickeddoll1958diespammers...@yahoo.com> wrote: > "ronbon" ... > [quoted text clipped - 5 lines] > > Mebbe I'm missing something. If you are blowing air at the front windshield to clear up frost, you probably do not want to be blowing humid/damp air at the windshield (which will just add to the existing frost). The AC is used to dehumidify the air before it is blown at the windshield that needs defrosting. Some cars will light up the AC light in defrost mode. Some others will just use the AC compressor, but not turn on the AC light. The 2001-2003 Prius is like the latter - if you turn the climate control to one of the front windshield positions (defrost), the gasoline engine will turn on to power the belt-driven AC pump, but the AC light does not come on. <mrv@kluge.net> "Wickeddoll®" wrote: > "ronbon" ... > [quoted text clipped - 5 lines] > > Mebbe I'm missing something. If you are blowing air at the front windshield to clear up frost, you probably do not want to be blowing humid/damp air at the windshield (which will just add to the existing frost). The AC is used to dehumidify the air before it is blown at the windshield that needs defrosting. Some cars will light up the AC light in defrost mode. Some others will just use the AC compressor, but not turn on the AC light. The 2001-2003 Prius is like the latter - if you turn the climate control to one of the front windshield positions (defrost), the gasoline engine will turn on to power the belt-driven AC pump, but the AC light does not come on. MRV Ya, that sounds like every car we've ever owned. Thanks. Natalie > 2005 corolla, A/C light does not come on in defrost mode. My Trooper > does in both defrost and floor/defrost. Is this normal? > Ron It could very well mean that something is amiss with your AC, something that is causing it not to work. Perhaps it is the belt, perhaps it is something more insidious. I believe that it should be automatically coming on with the Defrost setting to dry out the air. Try using the AC only and see if that causes the light to come on. See if it makes cold air come out (I would do this when the car is all warmed up inside and try it using 'inside air' to see if it chills that air). If the AC works fine it might only be that the light bulb is burned out or it is not telling the AC to turn on anymore for some reason. Come tell us what this test reveals. Tomes >> 2005 corolla, A/C light does not come on in defrost mode. My Trooper >> does in both defrost and floor/defrost. Is this normal? [quoted text clipped - 12 lines] > Come tell us what this test reveals. > Tomes Or, it could mean her car is not supposed to have the AC come on automatically with the defroster. Mine does. My son's 96 Camry does not. I'd suggest looking at the owner's manual, even if it looks scary, and requires going outside to get it. > 2005 corolla, A/C light does not come on in defrost mode. My Trooper > does in both defrost and floor/defrost. Is this normal? > Ron It's normal. The defrost mode uses the a/c compressor. Most newer vehicles design their systems to operate similarly. Your MPG will be reduced as well when driving in "defrost" mode due to the extra energy required to run the a/c compressor. I drive an '05 Corolla LE and it works just like yours. >> 2005 corolla, A/C light does not come on in defrost mode. My Trooper >> does in both defrost and floor/defrost. Is this normal? [quoted text clipped - 5 lines] > required to run the a/c compressor. I drive an '05 Corolla LE and it > works just like yours. OBTW ronbon, if you have the recirculate button pushed in and you select the defrost mode, it will cancel the button out. Normal. |
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