Posts by samosali
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then in my car soemthing is wrong (but it is not
). i do not turn AC off (never) but defrost blows hot air anyway. I am 100% sure that you are wrong because I do not have any fault code in my AC, so logically it works 100 % correct ... which means that you are wrong be sure that people will confirm my version. AC can be on, and the MB still produces heat in the cabin. that is inherent characteristic of this car, it was meant so when they built it
maybe you do not know that AC is designed also for reducing the moisture content of the air. And that goes with defrost function hand by hand.
it is very simple to understand:
- in most cars (if not in all cars) first the outside air is cooled by AC core which produces cold air (because of gas expansion inside the core). But the temperature of the produced cold air is ca. +6 °C .... not - 40°C
in this stage the moisture of the air is also reduced because cold air cannot contain so much water than hot air.- if the AC is put OFF then the outside air is not cooled and it passes through heater core which increases its temperature to let's say +40 °C but this is only for example ... the system then heats the cabin with this warm air.
I think you are bothered with the wrong assumption that cooling and hating are not working together but this is very wrong, because they do. explanation is very simple: when AC works on maximal power it produces +6 °C but as you know the cars are designed to increase the outside temperatures from - 30°C (for instance) to inside temperature +30 °C. so the heater core in the car does not know if it receives
a)the direct outside air with temperature let's say -10°C or
b)the air cooled by AC with temperature 6 °C like I stated.
So the path of the air is:
outside air - AC core - heater core - cabin - way out(the effect of AC when turned ON means nothing to heater in terms of heat, the heater can heat the cooled air without any problem ... but anyway, it is ok to have AC on to reduce the moisture)
I hope it is clear now
. trust me, I have built-in once a complete AC device into another car and it worked. I was forced to study how the thing works.P.S.: there is a big difference between good and bad AC devices: in bad cars the AC cannot function if outside temperature is below +5°C which means that you will have foggy windows, ecpecially if there is raining. In a good car, like MB, AC will work also at lower temperatures and therefore it will reduce the content of water in the cabin air, so the windows will not be foggy.I never turn my AC off. first because of the above facts and second because i believe it is better for an AC system to be constantly in move.
I am such an idiot. Of course you are right. It is also in manuals that AC goes off when defrost is on. it is actually my mistake but it happened because of game of words. So I admit that actually my statement about defrost - AC is wrong, however heating and "AC on" go together hand by hand like I wrote above. I think AC turns off (when deforst is on) in our cars only to increase the temperature of hot air blown onto the windshield for several degrees.
So I apologize for my statement that deforst and AC works together. It would be correct to write: they could work together or there is no problem to work together.
Sorry sorry sorry :bowdown::bowdown::bowdown:
actually the above statement was a reason for my reaction. The above statement is not correct in strict meaning of the word because defrost works when AC is on, it only overrides it (turns it off). In another words, defrost works always when we press the corresponding button, so specifying when defrost is not working, is not in place.
Grrrrrrrr
Actually nothing of the above statements are 100% correct.
1) EC on (red light on) means that AC is turned off (heating and blower work, cooling and decreasing of moisture do not work). If so, then pressing the defrost button turns it on (EC red light goes off). If you disengage defrost then EC red light will again come on which means that AC is OFF (but only if the EC red light was on before defrosting).
2) this is logicall because when using defrost we also want to get rid of eventual moisture (fog) inside the car, and only AC on can do it.
I knew that defrosting also controls AC, therefore I believed you that defrosting works with AC off. But the truth is that it actually works with AC on. At least it is so in my car. So I was actually the closest to the truth, your remarks only confused me.:crybaby2::crybaby2:
Actually nothing of the above statements are 100% correct.
1) EC on (red light on) means that AC is turned off (heating and blower work, cooling and decreasing of moisture do not work). If so, then pressing the defrost button turns it on (EC red light goes off). If you disengage defrost then EC red light will again come on which means that AC is OFF (but only if the EC red light was on before defrosting).
2) this is logicall because when using defrost we also want to get rid of eventual moisture (fog) inside the car, and only AC on can do it.
I knew that defrosting also controls AC, therefore I believed you that defrosting works with AC off. But the truth is that it actually works with AC on. At least it is so in my car. So I was actually the closest to the truth, your remarks only confused me.:crybaby2::crybaby2:
Everyone has his (her) own "truth". If it is based on own experienecs then everything is oK, but it is only another opinion. And there is several billion opinions about the same thing ....
I support your idea merc, in the same time I also understand dave. Indeed I read several years ago that Hyundai is on the top of a list where number of defects was analyzed. MB was near the bottom, but do not ask me more, because I forgot all details. Our cars are complicated machines, therefore no wonder that with increased age they are like clock-bombs. It is easy to bo on the top of the above list For Hyundai because of one simple reason:
they are not the leaders in automotive industry. they use only verified technology introduced by MB and similar companies, etc. When new technology is build into the cars, then most likely not all solutions are ok. The rest of the story is well known.
I support your idea merc, in the same time I also understand dave. Indeed I read several years ago that Hyundai is on the top of a list where number of defects was analyzed. MB was near the bottom, but do not ask me more, because I forgot all details. Our cars are complicated machines, therefore no wonder that with increased age they are like clock-bombs. It is easy to bo on the top of the above list For Hyundai because of one simple reason:
they are not the leaders in automotive industry. they use only verified technology introduced by MB and similar companies, etc. When new technology is build into the cars, then most likely not all solutions are ok. The rest of the story is well known.
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