| Fobulous |
I hope this is the right place for this post.
Anyway, one big annoyance i have with the temperture control is that whenever i set the recycled air from Vent, the AC turns on, and it doesn't matter what temp i set it to be. This annoyance can be a problem in the winter as it does get cold here (North Texas) and i sure don't want the AC turns on when it's 35 out there just because i want some recycled air.
Anyway knows how to resolve this?
Thanks! |
|
|
| Kris |
Welcome on board!
Unfortunately there is no solution to this "problem". Many commented in this feature but there is no real solution.
Nissan designed AC in that way to avoid fogging inside the car. Somehow I do not find it as a problem as it helps me keep the car dry inside. You will have to live with it. Sorry..... |
|
|
| manitoba murano |
Regardless of wether or not the AC is on, the temperature setting is the key--if you set it to 80, it'll still blow hot air.
If you don't want the AC on, then hit the AC button to turn it off. A minor annoyance, but this is pretty much the same in every (good) new car out there. |
|
|
| njjoe |
Fab-
Keep in mind that just because the light on the AC button is lit, that does not mean the AC is actually running. It just means that it is available. It will only come on if conditions warrant.
-njjoe |
|
|
| Corin |
I think your main point is that you don't want the AC on because you don't want cold air blowing when it's already way too cold.
For that, don't worry. The temperature will be controlled by your setting. Warm air will still blow, the AC compressor will just come on periodically to "dry out" the air.
I thought it was odd at first, but I've decided that I like it. My windows hardly EVER fog up in the winter, and I believe it's because the system operates this way.
And, just before you ask, the AC being on has an insignificant impact on MPG. A lot of threads here talking about that, and the conclusion is always the same. Essentially no effect. |
|
|
| darkoch |
| 35 degrees F is cold??? My winter temperature can easily drop to -35 degrees F or -37 degrees Celsius without a wind chill. Add a wind and you will feel what cold really is as some of my Canadian friends on this site can attest to! Anyway my AC controls work fine in heat and cold - you just have to set the temperature you want. :31: |
|
|
| Corin |
quote:
Originally posted by darkoch
35 degrees F is cold??? My winter temperature can easily drop to -35 degrees F or -37 degrees Celsius without a wind chill. Add a wind and you will feel what cold really is as some of my Canadian friends on this site can attest to! Anyway my AC controls work fine in heat and cold - you just have to set the temperature you want. :31:
35 degrees is cold. The winters YOU have are something completely different. I would not call them cold. In fact, I don't know WHAT I would call them, other than "a reason to move south".... :) |
|
|
| Tyler_Canada |
| Also, when you get below freezing, I believe the A/C does not come on at all (even though the light is lit). |
|
|
| Halo |
You can try this on your car:
On a cold day, with the car parked and the radio off (so you can hear) set the temp setting to the max it will go (90F) on both dials with the A/C light OFF. Let the heater go full blast for a while.
Then, hit the A/C button. In theory, the system should realize that you don't need cooling, but it doesn't.
You'll hear the relay for the A/C click, the compressor engage, and the RPM drop for a second as the load on the idling engine is increased. It's a bit hard to see it under the hood, but the compressor runs as long as you see the A/C light lit REGARDLESS of temperature setting, fan speed, outside temp.
As someone very accurately pointed out last time this subject was discussed, "air conditioning" is a means to dry the air, cooling is just a byproduct. NISSAN decided for you that you probably always want to dry the air, sometimes you want to then heat it up again.
It is not uncommon to want the compressor to run and help defog windows if it is below freezing.
Personally, I keep that A/C switch off unless it is really baking, but I'm fortunate to live in a very temperate, low humidity climate pretty much all year long. |
|
|
| Gonzo |
quote:
Originally posted by njjoe
Fab-
Keep in mind that just because the light on the AC button is lit, that does not mean the AC is actually running. It just means that it is available. It will only come on if conditions warrant.
-njjoe
Njjoe, Sorry but I don't completely agree with you and I am with Fobulous on this. I too hate the fact that it turns on the AC when the defrost or recirc is turned on. I would prefer it only turned on the AC when auto was pressed.
The AC compressor will cycle intermentatly regardless of the cabin temp.... it is monitoring the pressure/temp of the refirgerant... thus on a 50°F day with a cabin of 50°F while in the shade with the cabin temp set at 90°F they compressor will still cycle.
Fobulous, one thing to keep in mind that it is good to use the AC every so often, as I understand by circulating the refigerant it also acks to lubribate seals in the system too as part of the refergerant contains oil for this reason.
I make a habbit to NOT use AC especially in the winter but ensure I use it every few weeks. |
|
|
| manitoba murano |
The AC does come on when it is below zero. It serves a very useful purpose for those of us that might otherwise experience fogging, and freezing, on the inside of our windshield.
-40 is quite bearable if you dress for it. Unfortunately, we also get to 90+ in the summer, that's when things are unbearable. |
|
|
| Gonzo |
quote:
Originally posted by manitoba murano
The AC does come on when it is below zero. It serves a very useful purpose for those of us that might otherwise experience fogging, and freezing, on the inside of our windshield.
-40 is quite bearable if you dress for it. Unfortunately, we also get to 90+ in the summer, that's when things are unbearable.
0°C or 0°F? I thought it was around 35°F that the AC wouldn't come on to present the system from feezing over, I think the condensor...... |
|
|
| manitoba murano |
I could be wrong on this, as I am going from memory as to how my 04 maxima worked, but at temperatures well below freezing, turning on the a/c with the front window defrost provided optimal defogging. If I subsequently turned the a/c off, humidity would hit the window, and fog it up.
Is it true that the A/C shuts off at a certain point? I thought otherwise, as I seemed to be getting dried air out of the vents. |
|
|
| Eric L. |
Lots of confusion here on this, and perhaps I'll be adding to it, but here are my observations:
1) If the AC light is lit, the AC compressor is on, period. No cycling, just on. I have never heard the AC clutch click on and off while driving, or even at idle, only when I press the AC button to turn it on or off. Hence, I am not sure the MO's AC cycles on and off like other cars. Correct me if I'm wrong here, but I think if you hear something cycling on and off while at idle in the MO, its not your AC clutch, its the secondary fan clutch. On my Maxima, I could clearly hear the AC clutch cycling on and off.
2) During the winter I find that the air outside is less humid than the air inside the car (i.e. caused by your own breathing), so AC while heating is not really necessary. I turn off the AC in that situation.
3) There is an intake temperature below which the AC compressor will not turn on - its in the service manual and is pretty near freezing (2.5C or 37F).
4) Theoretically with automatic climate control, the AC compressor never needs to be off. Once you set the temperature, the heater core is controlled by the ECU and adjusts the temperature by heating up the AC'ed air. 200F coolant can heat up any amount of AC'ed air to a toasty 90F (if you want to bake yourself in the car). |
|
|
| Tyler_Canada |
quote:
Originally posted by Eric L.
1) If the AC light is lit, the AC compressor is on, period. No cycling, just on. I have never heard the AC clutch click on and off while driving, or even at idle, only when I press the AC button to turn it on or off. Hence, I am not sure the MO's AC cycles on and off like other cars. Correct me if I'm wrong here, but I think if you hear something cycling on and off while at idle in the MO, its not your AC clutch, its the secondary fan clutch. On my Maxima, I could clearly hear the AC clutch cycling on and off.
It IS the fan(s), but it's not a clutch. Both fans are electric. The fans only run when the A/C compressor is running or the coolant is above a set temperature. With the engine cold and the A/C on, you can hear the fans turning on and off, because the compressor is turning on and off. The fans would not be running to cool the coolant because the coolant isn't warm yet.
The rest of your points are correct though :) |
|
|
| Eric L. |
quote:
Originally posted by Tyler_Canada
It IS the fan(s), but it's not a clutch. Both fans are electric. The fans only run when the A/C compressor is running or the coolant is above a set temperature. With the engine cold and the A/C on, you can hear the fans turning on and off, because the compressor is turning on and off. The fans would not be running to cool the coolant because the coolant isn't warm yet.
The rest of your points are correct though :)
Even with "AC off" I can hear a click when the fan engages. Yeah you are right, its not a clutch, but maybe its a solenoid? Usually its the main cooling fan (there are two) that I hear click on when the car is idling. I'll have to double check, but I think the second AC fan is always spinning when the AC is on.
An ideal system would cycle the compressor, but I still think the AC compressor in the MO does not cycle on and off from what I can tell. Can't even find any mention of it in the shop manual either. But thats just from my random observation and mad ramblings. |
|
|
| Tyler_Canada |
| Another reason I believe it cycles is because I can feel the drag on the engine change. Especially when decelerating using DS. And no, I'm not feeling the torque converter :) I can feel the increased drag that happens at the same instant I hear the fan click on. |
|
|
| njjoe |
YES - The A/C compressor does cycle on and off in normal operation. I just went under the hood to verify the operation.
-njjoe |
|
|
| Eric L. |
quote:
Originally posted by njjoe
YES - The A/C compressor does cycle on and off in normal operation. I just went under the hood to verify the operation.
-njjoe
What temperature did you have your climate control set to? Maybe the reason I've never felt mine cycle is because I always set it to be very cold. If I want AC, I generally turn it all the way down to 60, and even on the hottest days, never above 65. In the winter, I set the thermostat to 68, but only with AC off for full heat. |
|
|
| njjoe |
quote:
Originally posted by Eric L.
What temperature did you have your climate control set to?
E-
The HVAC temp was set to 70F and the ambient was 66F.
-njjoe |
|
|
| Tyler_Canada |
| I typically have mine set to 74F in summer and 77F in winter. I like it warm :) |
|
|
| Eric L. |
Ok, you guys like it hot in the MO! :D
Makes sense now, why I don't hear my AC cycling and off (maybe it still does, sneakily, when I'm not paying attention....I'd put nothing past the MO). Cannot wait to leave work and drive home in my mobile refridgerator! :p |
|
|
| Gonzo |
It wouldn't really matter what the temp you have set in the cabin... the actually outside temp would have a bigger impact as to how often the compressor cycles.
The compressor turns off after the refirgerant reaches a certain pressure/temperuture. Its that simple, the technology is old.
It was initially developed in 1902... but its princiapls go back to the Romans if you can believe it. Of course its been improved on since but the same principals apply. |
|
|
|
