Does the Inside Temperature Number Mean Anything?
#16
The problem with the G35 sedan is that the automatic setting is setup incorrectly. It does not actually use the inside air temp to adjust the fan speed. It actually uses the outside air temperature. Therefore, when it is really hot out you need to set it about 10-20 degrees below what the outside air is and then adjust it yourself as the car cools down. This really defeats the point of the automatic setting doesn’t it? This is the only design problem I have with the car but it is becoming increasingly annoying. I live in North Carolina where it can get pretty hot! My car usually reads 107 degrees when I get in it at the end of day. That means that my AC is always on full blast on the auto setting until the car gets moving and the temp reading starts to get closer to the real outside air temp.
#17
Originally Posted by mpgxsvcd
The problem with the G35 sedan is that the automatic setting is setup incorrectly. It does not actually use the inside air temp to adjust the fan speed. It actually uses the outside air temperature.
Originally Posted by mpgxsvcd
My car usually reads 107 degrees when I get in it at the end of day. That means that my AC is always on full blast on the auto setting until the car gets moving and the temp reading starts to get closer to the real outside air temp.
#18
Originally Posted by damonb10
Streaker, I couldn't agree more. I'm an electrical engineer with an emphasis in control systems and it just cracks me up how people fiddle with systems that are meant to be set and left alone.
One poster above claims that he sets it to 72 when he gets in the car and it blasts cold air, but then he has to turn it down to 74-75 otherwise "he'll freeze". Well, then just set it at 74-75 and leave it alone. If you want to run the system on auto, you need to find the temp that is comfortable for you and leave it. Keep in mind that the greater the temperature difference you are trying to create (outside air vs inside setting) the more aggressive the system will be, i.e. high fan speeds etc....
Please, trust the engineers and see what happens
One poster above claims that he sets it to 72 when he gets in the car and it blasts cold air, but then he has to turn it down to 74-75 otherwise "he'll freeze". Well, then just set it at 74-75 and leave it alone. If you want to run the system on auto, you need to find the temp that is comfortable for you and leave it. Keep in mind that the greater the temperature difference you are trying to create (outside air vs inside setting) the more aggressive the system will be, i.e. high fan speeds etc....
Please, trust the engineers and see what happens
#19
No the problem is that the fan will continue to run even after the temperature in the car has dropped below the temperature that you have the dial set to. I know this because I tried it. Go out on a hot day. Today it was 87 when I first got in the car. After driving the outside temp still read 83. I set the A/C gauge to 73. The air conditioning was not on full blast but it was on at least halfway. I drove around for about 20 minutes with the temp still set on 73. The result. The car was freezing. Now I didn’t have a thermometer with me but I can tell you it was well below the 73 degrees I had the dial set to. I will measure it with a thermometer next time. I checked the manual and it only mentions a thermometer in front of the radiator. That means that the only temperature that it can base the automatic setting on is the outside temperature. If you can find anything that says there is an inside thermometer please let me know where it is located. Until then I believe that the Automatic climate control is designed improperly and it is no where near as effective as the ones used in a Honda/Acura. That being said. I still love my G35.
#20
Originally Posted by mpgxsvcd
Today it was 87 when I first got in the car. After driving the outside temp still read 83. I set the A/C gauge to 73. The air conditioning was not on full blast but it was on at least halfway. I drove around for about 20 minutes with the temp still set on 73. The result. The car was freezing.
Originally Posted by mpgxsvcd
Now I didn’t have a thermometer with me but I can tell you it was well below the 73 degrees I had the dial set to. I will measure it with a thermometer next time.
#21
My point about the thermometer is that if they do not have a thermometer in the cabin of the car then there is no way that they are controlling the air flow from the A/C based on the inside air temperature at all. Please tell me the location of any thermometers inside of the G35 sedan cabin. I could not find any indication that there are any inside the car in the user manual. Maybe there is but I could not find it. Without this then the design is flawed and the car can not regulate the temperature of the car at all. This is what is actually happening. Try it your self. If I set it to 76 when it is only 83 out then it is cold but not too bad. If I set it to 76 when it reads 107 out then it is down right cold in the car after running the A/C for awhile because the temperature difference is too great. Please prove me wrong on this point. I would love nothing more than to find a way to get the A/C to work properly. My wife can’t stand the fact that she has to keep adjusting the temperature when it is supposed to be automatic.
#22
I do agree with you, that they'd be using some kind of fuzzy logic if there isn't an internal thermometer. I thought I remember reading something in the manual about one though. There are two sensors on the dash; I thought one was for the auto headlights and the other was the thermometer. Not sure though.
If that is the thermometer, then the next question would be where would the second one be for dual-zone control???? More fuzzy logic?
If that is the thermometer, then the next question would be where would the second one be for dual-zone control???? More fuzzy logic?
#24
Originally Posted by damonb10
I do agree with you, that they'd be using some kind of fuzzy logic if there isn't an internal thermometer. I thought I remember reading something in the manual about one though. There are two sensors on the dash; I thought one was for the auto headlights and the other was the thermometer. Not sure though.
If that is the thermometer, then the next question would be where would the second one be for dual-zone control???? More fuzzy logic?
If that is the thermometer, then the next question would be where would the second one be for dual-zone control???? More fuzzy logic?
#25
Originally Posted by KingoftheRoad1
Most cars, with the exception of truly luxury cars, are not real climate control. My 99 328i Bimmer had a much better a/c/heating than the G35.
#26
#27
Originally Posted by Streaker
I was an HVAC contractor for many years and have seen folks driven nuts trying to outthink the heating/cooling system. My suggestion would be for you to set the system on automatic A/C and set both sides at 75 (for starters). You can fine tune the settings later on.
Then just sit back and let the system do its thing. Playing with it only defeats what the Infiniti engineers have built in. Setting the thermostat to its lowest temp will not cool your car any faster. If there is something wrong with your car, have the dealer fix it.
Then just sit back and let the system do its thing. Playing with it only defeats what the Infiniti engineers have built in. Setting the thermostat to its lowest temp will not cool your car any faster. If there is something wrong with your car, have the dealer fix it.
#28
Whomever is getting the thermometer out to check this out - try something while your out there. Set the temp to 70 and then see what the temp of the air coming out of the vent is. Please also try it at 60 and at 75 or so. My theory, as mentioned earlier, is that the temp is the temp of the air it is putting out not the temp of the cabin. Maybe it is just my imagination that it feels colder to my hand.
#29
Originally Posted by mpgxsvcd
No the problem is that the fan will continue to run even after the temperature in the car has dropped below the temperature that you have the dial set to. I know this because I tried it. Go out on a hot day. Today it was 87 when I first got in the car. After driving the outside temp still read 83. I set the A/C gauge to 73. The air conditioning was not on full blast but it was on at least halfway. I drove around for about 20 minutes with the temp still set on 73. The result. The car was freezing. Now I didn’t have a thermometer with me but I can tell you it was well below the 73 degrees I had the dial set to. I will measure it with a thermometer next time. I checked the manual and it only mentions a thermometer in front of the radiator. That means that the only temperature that it can base the automatic setting on is the outside temperature. If you can find anything that says there is an inside thermometer please let me know where it is located. Until then I believe that the Automatic climate control is designed improperly and it is no where near as effective as the ones used in a Honda/Acura. That being said. I still love my G35.
#30
Originally Posted by damonb10
I'm an electrical engineer with an emphasis in control systems and it just cracks me up how people fiddle with systems that are meant to be set and left alone... Please, trust the engineers and see what happens
For my wife and me, it's much more comfortable when getting in the car in 95-degree-plus days to set the blower to manual mode, crank down the temperature to 60 degrees and manage it ourselves until the cabin cools down, then set the thing back to auto, raise the temperature to 76 or so and let the system take over. You engineers can be smart, yes, but you often have no common sense when it comes to the human component of a system. The Nissan automatic climate control system is a prime example.