2002 Corolla Turning the AC on when defrosting
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From: JoeSpareBedroom on 28 Jul 2010 16:36 "Jeff Strickland" <crwlrjeff(a)yahoo.com> wrote in message news:i2q45l$gna$1(a)news.eternal-september.org... > > "JoeSpareBedroom" <newstrash(a)frontiernet.net> wrote in message > news:J304o.38606$KT3.37541(a)newsfe13.iad... >> "C. E. White" <cewhite3(a)mindspring.com> wrote in message >> news:i2q1t5$9ok$1(a)news.eternal-september.org... >>> >>> "JoeSpareBedroom" <newstrash(a)frontiernet.net> wrote in message >>> news:Ue%3o.38604$KT3.31863(a)newsfe13.iad... >>> >>>> 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. >>> >>> Well the next time the tempearture is down around zero F, turn on the >>> A/C - if the compressor enagages you'll know it becasue of the squealing >>> belt sound (if you are lucky) or the grinding sound of a compressor >>> disentegrating (if you are unlucky). >> >> I guess the compressor's been disintegrating since the day I bought the >> truck, brand new. >> > > Have you physically looked at it? > > If the truck is adjusting itself properly, there will be no effect on the > tach when the compressor is engaged, or not. Or the effect will be so > small as to be unnoticable by looking at the tach. The effect is momentary, since as you said, the engine adjusts. But it is noticeable for that brief moment. > But whatever. Your entire argument is beside the point of the topic. No, it's absolutely relevant.
From: nm5k on 28 Jul 2010 21:21 On Jul 28, 2:05 pm, "C. E. White" <cewhi...(a)mindspring.com> wrote: 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 That's how most of them work I think. Low pressure switch.. Pretty sure that is how the one on my 05 works.. Also, I'd have to double check as I really don't use defrost very much, but I don't think my compressor light comes on in defrost mode, unless the compressor button is already pushed in. If it's winter and I turn on the defrost, I don't think my light comes on even though the compressor will be running. But I'd have to double check that.. Like I say, I hardly ever use defrost.. But I know for sure mine uses a pressure switch as it will often cycle when the car is cold inside and the engine is idling. With the lower idle speeds the pressures drop and bingo, off it goes.. You can see the rpm's change when it drops in and out. With the A/C idle up solenoid, mine actually idles faster with the A/C on, than it does with it off. Once mine is cooled down, my register air will be 40-45 degrees. Often right at 40 with the car fully cooled down. I keep a "pen" thermometer stuck in the drivers side vent.. So won't take much of a pressure drop to click it off. Just stopping at a light will do it after a few minutes. I'm fairly certain the same system is what cuts it off and on in the winter. And I agree.. Running the compressor a few times in the winter is actually good for the seals, rather than causing extra wear. It's seals that take a set from sitting too long that usually cause compressor seal leaks. Even if a car didn't run the compressor in the winter as say in old cars, I'd still run it myself every once in a while.
From: Jane Galt on 29 Jul 2010 00:41 "Elmo P. Shagnasty" <elmop(a)nastydesigns.com> wrote : > In article <Xns9DC2F27677FCBJaneGgulchxyz(a)216.196.97.142>, > Jane Galt <Jane_G(a)gulch.xyz> wrote: > >> ( 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! ) > > Then I think you don't understand how to use your climate control. > > You may move the temperature anywhere you want, even if the AC is on; > hot air will blend with the cold air, and you'll get a temperature you > like. No need to keep the temperature on coldest all the time and then > turn the AC on and off by hand. > I know but didn't want to waste gas. -- - Jane Galt
From: Jane Galt on 29 Jul 2010 00:42 "JoeSpareBedroom" <newstrash(a)frontiernet.net> wrote : > "Elmo P. Shagnasty" <elmop(a)nastydesigns.com> wrote in message > news:elmop-0D9C6B.09505028072010(a)reserved-multicast-range-not-delegated.e > xample.com... >> In article <pAV3o.38107$4B7.19550(a)newsfe16.iad>, >> "JoeSpareBedroom" <newstrash(a)frontiernet.net> wrote: >> >>> >> ( the AC is SO cold in this car that if >>> >> it's cloudy in the summer, we have to keep switching the ac button >>> >> on and >>> >> off! ) >>> > >>> > Then I think you don't understand how to use your climate control. >>> > >>> > You may move the temperature anywhere you want, even if the AC is >>> > on; hot air will blend with the cold air, and you'll get a >>> > temperature you like. No need to keep the temperature on coldest >>> > all the time and then turn the AC on and off by hand. >>> >>> >>> Every woman I've ever driven with has only known extreme ways of >>> adjusting >>> the temp in the car. Too cold? Shut off the AC! Too hot? Turn the knob >>> all >>> the way to cold. There seems to be no in-between. >> >> You've just described my wife. >> >> She has a fancy automatic climate control in the car; she insists on >> fiddling with every control all the time, constantly changing the >> temperature and the airflow speed and direction. >> >> 72 degrees, and let the perfectly competent computer do it? NAH! > > > And yet, they're OK with letting the thermostat do its job at home. > Usually. Maybe. > > <blush> -- - Jane Galt
From: Jane Galt on 29 Jul 2010 00:44
"Jeff Strickland" <crwlrjeff(a)yahoo.com> wrote : > > "C. E. White" <cewhite3(a)mindspring.com> wrote in message > news:i2pv67$tj1$1(a)news.eternal-september.org... >> >> "Jeff Strickland" <crwlrjeff(a)yahoo.com> wrote in message >> news:i2peh1$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. >> > > I agree. There can't be more of an affect than few miles on an entire > tank of gas that comes from using the AC. A couple of mpg? > One can do more harm to the > fuel consumption by stomping the pedals than he can by being comfortable > while he's stomping the pedals. I don't know how many miles per tank the > AC will use but I'd expect less than 20, and probably less than 10. > > And, keeping the parts lubricated is never a bad idea. > > > > > > > > -- - Jane Galt |