2002 Corolla Turning the AC on when defrosting
in [Toyota]
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From: Jeff Strickland on 28 Jul 2010 10:21 "Jane Galt" <Jane_G(a)gulch.xyz> wrote in message news:Xns9DC2F27677FCBJaneGgulchxyz(a)216.196.97.142... > =?iso-2022-jp?q?Hachiroku_=1B$B%O%A%m%=2F=1B=28B?= <Trueno(a)e86.GTS> wrote > : > >> On Tue, 27 Jul 2010 22:08:17 -0500, Jane Galt wrote: >> >>> When the windshield fogs up a little and we direct the vents up there >>> to clear it, it turns the AC compressor on and freezes us. >>> >>> Did they seriously design the car this way, or is something wrong? >>> >>> Because this is NOT gonna be fun when it's 0 degrees outside and it's >>> all we can do to heat the car, and because the vents are set on the >>> windshield, to keep it clear, the AC is running too. >> >> >> You'll never notice it. > > My gas bill will notice it, and it puts wear on the compressor. > You gas consumption from the AC isn't worth the discussion. Less than a few miles on a tank of gas. >> >> In this case, the AC is acting like a dehumidifer, removing moisture >> from the air and clearing the windshield faster. Works great on those >> days when the humidity is high, it's raining and the windows are all >> fogged up. >> >> The temp control blends the air coming into the cabin, so on cold days >> even with the ac on it's still warm. >> >> I just don't like turning on the AC every time I was to use the >> defroster. My Grand Voyager had a little arm in the control box that hit >> the AC button from inside the box when you turned on the defroster. >> First thing I "removed" when I found out how it worked... <SNAP!> ;) >> (I can activate the AC all by myself, thank you!) >> >> I wouldn't try that with your car...it's probably electronic > > If I could modify the car, I'd put a switch in there to select headlights > on all the time, or not. I'd put a darn thermostat in for the AC > compressor > so we dont have to do that by hand. ( the AC is SO cold in this car that > if > it's cloudy in the summer, we have to keep switching the ac button on and > off! ) And I'd put in an option switch to either turn on the AC compressor > in the windshield mode, or not. > > More options are better, especially when they cost almost nothing. > > You know, I was with someone in a Cadillac in the early 70's and we were > driving at night, and the Caddy dimmed its headlights automatically when > an > oncoming car appeared, then turned them back up after it passed. I > remember being in awe of how advanced that was for that time, but they > still dont even do that in these cars, despite it being a really > inexpensive thing to do. > Turn the temp dial off of blue and towards the red, the heat will be sufficient for yoru comfort. In the mean time, the dry air from the AC will clear the fog off of the glass. Next time the windows fog up, leave the air flow selection wherever it is and turn the AC on. The windows will clear, just not as quickly as if the defroster is selected. You don't need the air on the glass to clear it, you only need the air to be dry. That is what the AC does, it dries the air. Alternatively, clear the glass with the defroster, then change the air flow selection back to the dash vents and leave the AC on, and wait for the glass to fog up again. (Hint: It will be a long wait.)
From: JoeSpareBedroom on 28 Jul 2010 10:35 "C. E. White" <cewhite3(a)mindspring.com> wrote in message news:i2pe4m$ht0$1(a)news.eternal-september.org... > > No need to worry. The AC compressor won't run when the temperature is > below 40 degrees F or so. > Actually, the compressor runs at any temp in my 02 Tacoma. Easy to tell while still idling in the driveway. When I switch to defrost, I get the same click from under the hood and the same effect on the tach as when using the defrost/AC at higher temps. Might be different for her Corolla, though.
From: C. E. White on 28 Jul 2010 15:05 "JoeSpareBedroom" <newstrash(a)frontiernet.net> wrote in message news:LeX3o.38119$4B7.33578(a)newsfe16.iad... > "C. E. White" <cewhite3(a)mindspring.com> wrote in message > news:i2pe4m$ht0$1(a)news.eternal-september.org... > >> >> No need to worry. The AC compressor won't run when the temperature is >> below 40 degrees F or so. >> > > > Actually, the compressor runs at any temp in my 02 Tacoma. Easy to tell > while still idling in the driveway. When I switch to defrost, I get the > same click from under the hood and the same effect on the tach as when > using the defrost/AC at higher temps. > > Might be different for her Corolla, though. I'll bet you that the compressor does not run when the underhood temperature is below approximately 40 degrees F no matter what you think. All modern vehicle AC Systems incoprate either a thermal switch or a low pressure switch that inhibit compressor operation at low temperatures. I am sure your Toyota Tacoma includes a low pressure switch that inhibits the compressor engagement at low tempeatures (I think it is called a binary Pressure Switch - it switches off the compressor when the pressure is too high or too low - at 40 degrees, the pressure will be too low becasue almost all the refrigerant will have condensed). You might still hear a relay click, but I am sure the compressor doesn't run. If you don't have a switch like this, what do you suppose happens when your compressor tries to pump liquid refreigerant? Ed
From: C. E. White on 28 Jul 2010 15:08 "Jeff Strickland" <crwlrjeff(a)yahoo.com> wrote in message news:i2peh1$ird$1(a)news.eternal-september.org... > > "Jane Galt" <Jane_G(a)gulch.xyz> wrote in message >> My gas bill will notice it, and it puts wear on the compressor. > > You gas consumption from the AC isn't worth the discussion. Less than a > few miles on a tank of gas. For years I have kept a gas mileage log book. I've never been able to find a difference in mileage based on the time of the year (Winter/Fall/Spring versus summer). This implies to me, the cost to run the A/C is negligible. As for wear, running the compressor occasionally is actually a good thing - it assures the internal components and seals stay lubricated. Ed
From: JoeSpareBedroom on 28 Jul 2010 15:08
"C. E. White" <cewhite3(a)mindspring.com> wrote in message news:i2puvv$slq$1(a)news.eternal-september.org... > > "JoeSpareBedroom" <newstrash(a)frontiernet.net> wrote in message > news:LeX3o.38119$4B7.33578(a)newsfe16.iad... >> "C. E. White" <cewhite3(a)mindspring.com> wrote in message >> news:i2pe4m$ht0$1(a)news.eternal-september.org... >> >>> >>> No need to worry. The AC compressor won't run when the temperature is >>> below 40 degrees F or so. >>> >> >> >> Actually, the compressor runs at any temp in my 02 Tacoma. Easy to tell >> while still idling in the driveway. When I switch to defrost, I get the >> same click from under the hood and the same effect on the tach as when >> using the defrost/AC at higher temps. >> >> Might be different for her Corolla, though. > > > I'll bet you that the compressor does not run when the underhood > temperature is below approximately 40 degrees F no matter what you think. > All modern vehicle AC Systems incoprate either a thermal switch or a low > pressure switch that inhibit compressor operation at low temperatures. I > am sure your Toyota Tacoma includes a low pressure switch that inhibits > the compressor engagement at low tempeatures (I think it is called a > binary Pressure Switch - it switches off the compressor when the pressure > is too high or too low - at 40 degrees, the pressure will be too low > becasue almost all the refrigerant will have condensed). You might still > hear a relay click, but I am sure the compressor doesn't run. If you don't > have a switch like this, what do you suppose happens when your compressor > tries to pump liquid refreigerant? > > Ed > Beats me. All I know is what I observe, Ed: The sound, and the effect on the RPMs, which is identical to what happens in summer. |