Turning the 'vent' on 'front window' (turn knob furthest right) automatically enables the aircon? Is this true? i tested it today and it sounds like the aircon comes on every time i turn it on...
Turning the 'vent' on 'front window' (turn knob furthest right) automatically enables the aircon? Is this true? i tested it today and it sounds like the aircon comes on every time i turn it on...
What? you mean defrost?
then yes, it keeps the AC lubricated during winter months .. .
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Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
then yes, it keeps the AC lubricated during winter months .. .
Maybe it does keep everything lubricated, I don't doubt that, but that isn't the main reason. The main reason the A/C comes on automatically when you switch to 'defrost' is that the A/C - at least when the temp selector is set to 'warm' - will help de-humidify the air (which is supposed to help 'defrost' to perform better - as well as helping perform 'defrost's' other function - 'de-fogging' the windshield.) In some cars that have a button to turn on the A/C - rather than A/C being a setting on the dial as in my Mustang - and a light to indicate that the A/C is on (my wife's Mazda 6, for example), that light comes on every time you switch to defrost, showing that the A/C is, indeed, on - and (at least on her car) there is no way to turn it off (pressing the A/C on/off button, in that instance, has no effect.)
Maybe it does keep everything lubricated, I don't doubt that, but that isn't the main reason. The main reason the A/C comes on automatically when you switch to 'defrost' is that the A/C - at least when the temp selector is set to 'warm' - will help de-humidify the air (which is supposed to help 'defrost' to perform better - as well as helping perform 'defrost's' other function - 'de-fogging' the windshield.) In some cars that have a button to turn on the A/C - rather than A/C being a setting on the dial as in my Mustang - and a light to indicate that the A/C is on (my wife's Mazda 6, for example), that light comes on every time you switch to defrost, showing that the A/C is, indeed, on - and (at least on her car) there is no way to turn it off (pressing the A/C on/off button, in that instance, has no effect.)
no, the heat alone would evaporate any water on the windshield. -the change was made to keep the seals lubricated, and to keep the refrigerants in the system and out of the ozone layer in the mid 80s or do. I seem to remember 1987 was when the rule change came down, and it was implemented somewhere in the late 80s-early 90s.
In the newspapers, they told folks to run the AC in the winter - I remember I was still driving my mom's station wagon -so it had to be 1985 or 6 when they started evaluting the change.
__________________
Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
no, the heat alone would evaporate any water on the windshield. -the change was made to keep the seals lubricated, and to keep the refrigerants in the system and out of the ozone layer in the mid 80s or do. I seem to remember 1987 was when the rule change came down, and it was implemented somewhere in the late 80s-early 90s.
In the newspapers, they told folks to run the AC in the winter - I remember I was still driving my mom's station wagon -so it had to be 1985 or 6 when they started evaluting the change.
Air conditioning is just that - air conditioning. Not 'air cooling.' A/C does just that - conditions the air, partly by de-humidifying it. Hot air will not always dry things - and hot air is not always dry - just ask anyone from the South or Southeast - especially Louisiana or Florida - or Tennessee. Yes, the hot air coming through the defrost will eventually be dry enough to de-fog the windshield, but having the a/c run at the same time - de-humidifying the air - makes it work much more efficiently. Now, I am willing to believe that the two functions (dehumidifying and lubricating) might be of equal importance, but de-humidification is definitely a function of the a/c running with defrost (else, why would some cars not run the a/c only when the floor vents are being used instead of linking it, necessarily, to the defrost?)
Hmmm...could it be that they originally started linking the two for the purposes of lubrication and, in so doing, found that the dehumidifying properties of a/c made the defrost work more efficiently? I guess that could be the case.
Air conditioning is just that - air conditioning. Not 'air cooling.' A/C does just that - conditions the air, partly by de-humidifying it. Hot air will not always dry things - and hot air is not always dry - just ask anyone from the South or Southeast - especially Louisiana or Florida - or Tennessee. Yes, the hot air coming through the defrost will eventually be dry enough to de-fog the windshield, but having the a/c run at the same time - de-humidifying the air - makes it work much more efficiently. Now, I am willing to believe that the two functions (dehumidifying and lubricating) might be of equal importance, but de-humidification is definitely a function of the a/c running with defrost (else, why would some cars not run the a/c only when the floor vents are being used instead of linking it, necessarily, to the defrost?)
Hmmm...could it be that they originally started linking the two for the purposes of lubrication and, in so doing, found that the dehumidifying properties of a/c made the defrost work more efficiently? I guess that could be the case.
Then why not run the AC when the heat is on as well?
__________________
Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
Then why not run the AC when the heat is on as well?
Because dehumidification isn't necessary to simply warm the air - which is the main function of the heater, just to dry it more quickly - which is one of the two functions of defrost. Haven't you ever run the defrost on 'cool' to clear the windshield of fog on particularly humid Summer days (maybe not, considering where you live - I have done so often in the humid East Tennessee summertime - particularly at night.) Sometimes, in such circumstances, the defrost (with the automatic a/c) running on cold can be more efficient in clearing the windshield than running it on hot or warm (so that, in those cases, it is clearly not the heat or hot air that is clearing the moisture, but the dehumidifying properties of the a/c.)
Being that there would be little or no benefit to running the a/c when you simply need heat rather than when clearing a windshield, there would be no good reason to do that (unless the sole function was to keep the system lubricated.) Also, running the a/c pretty much constantly whenever the heat is on - rather than simply running it when there is some benefit to doing so - would cut down on fuel efficiency.
I'll have to try and find the source where I first read about the a/c, dehumidification and defrost. I think it was actually in the 'owner's manual' of one of the vehicles we have owned - hopefully, it is one that we still own. I'm hoping it was in the manual for my wife's Mazda but it might have been the VW that I had or one of the other vehicles we have owned in the past couple of years (my wife and I have ended up trading vehicles almost more in the last couple of years than I have during my lifetime to this point.)
Because dehumidification isn't necessary to simply warm the air - which is the main function of the heater, just to dry it more quickly - which is one of the two functions of defrost. Haven't you ever run the defrost on 'cool' to clear the windshield of fog on particularly humid Summer days (maybe not, considering where you live - I have done so often in the humid East Tennessee summertime - particularly at night.) Sometimes, in such circumstances, the defrost (with the automatic a/c) running on cold can be more efficient in clearing the windshield than running it on hot or warm (so that, in those cases, it is clearly not the heat or hot air that is clearing the moisture, but the dehumidifying properties of the a/c.)
Being that there would be little or no benefit to running the a/c when you simply need heat rather than when clearing a windshield, there would be no good reason to do that (unless the sole function was to keep the system lubricated.) Also, running the a/c pretty much constantly whenever the heat is on - rather than simply running it when there is some benefit to doing so - would cut down on fuel efficiency.
I'll have to try and find the source where I first read about the a/c, dehumidification and defrost. I think it was actually in the 'owner's manual' of one of the vehicles we have owned - hopefully, it is one that we still own. I'm hoping it was in the manual for my wife's Mazda but it might have been the VW that I had or one of the other vehicles we have owned in the past couple of years (my wife and I have ended up trading vehicles almost more in the last couple of years than I have during my lifetime to this point.)
Right, but before the change, you just turned on the AC, and selected the defrost vents. (It gets pretty d***ed humid in Eastern Kansas Lots of rivers).
It wasn't automatic.
__________________
Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
A/C yes, conditions the air by removing humidity. When set to cool, the refrigerant does cool the air. It is the same concept with your central A/C or even window A/C units.
Didn't know front window vent uses aircon? 
