Auto Climate Control Temp Regulation

[Redfearn]

I traded a Lexus IS350 for my 2010 G37. In the Lexus (with auto climate, like the G37), I set the temperature to 74 and never touched it - it gave me a comfortable temperature when it was 95 outside or 55. Now, with the G37, it seems I am changing the temperature setting all the time. The car sits in the sun at work, and the outside temperature can get up to 95 or higher (SFV location in SoCal). The AC is amazing - it cools down immediately, but to get a comfortable temperature, I have to set the temperature control to 78 or higher. Next morning, when I start out and the outside temperature is 65, I have to set the temperature control down to 70 or the heat comes on! Is the temperature control (over) reacting to the outside temperature - or is the inside temperature sensor getting over-heated when the car sits in the sun? Anyone else have this experience? Maybe I need to talk to the dealer service department.

David

[zozoka1212]

I have no issue with mine. Although my G is an 08 but have the same system. Only time I touch the temperature when it is freezing and I want to melt the ice on the windshield. Other than that rest of the year it stays on the same temperature.

How come you did not buy another IS350?

[Redfearn]

I'll have the dealer check it when it goes in for the first service.

I switched from the IS350 because: (1) I got tired of the multiple recalls (engine valve spring replacement was the latest - pending - recall); (2) I got tired of the stiff, noisy ride (the car had 18" wheels with summer tires and was too stiff riding - I like the 17" wheels and all season tires on the G37 much better); (3) the car was four years old, and I wanted something new. The G37's have been priced very aggressively. I also looked at the BMW 328, but that car is over-priced and under-equipped, and reliability is not as good. It drives nice, though.

The IS350 with 17" wheels and tires would have been a better fit for me - but most every IS350 delivered in SoCal has the 18" wheels and summer tires - is is a "mandatory option". Swapping out the existing wheels and tires would have cost me $2K, probably. The 350 engine is a great engine - and I never had any problems with the IS - the only time it was in the dealer was for regular service and those many recalls.

David

[SteveTheTech]

Congrats on the new sedan. We are members of a rare group. Those who actually prefer function over aesthetics, when it comes to things like ride comfort vs.

I have a question about the two of your most recent vehicles. What color combinations are/were they?

Infiniti has been using roughly the same automated climate control since 1990. Control is now very finite and it uses far more efficient components but the principal is similar. They still use three temperature sensors (one infront of the radiator, one in the area of the microfilter, and one by the drivers right knee) to modulate the outlet vent and temperature positioning. It is not a perfect system but when you find the right seating position and vent orientation to suit your needs you shouldn't need to adjust it too much, but it might not only time will tell.

Good Luck

[Redfearn]

The IS was silver - the G37 is graphite (significantly darker). We haven't had really hot weather so far this summer so the G has't gotten really hot inside yet - it does go over 100 here normally - if the car has been in the shade and it is not really hot inside, the temp does seem to regulate better. Makes me think the interior temp sensor gets hot and does not cool down quickly enough when the A/C runs. (I have a windshield shade in place when it sits in the sun so there is no direct sun on the dash.)

[Poyzinous]

if the inside of the car is much cooler than the outside, it may react with stronger cooling/heating when you set the inside temp at a big difference from the outside temp.

[joe603]

There's a huge difference when you use recirculated vs. outside air.

[Redfearn]

I think it switches to recirculate automatically when the interior is hot. Are you suggesting that switching it to outside air would work better?

[SteveTheTech]

You might want to think about something like 3Ms Chrystalline line window tint.
http://www.crystallinefilms.com/

[Redfearn]

Turning off recirculate mode after the car cools down helps a lot. When the car starts off cool with the AC on, it doesn't turn on recirculate mode and that is why it works better that way. I am amazed at how powerful the AC is!

[busterbrown]

I have had quite a few cars with auto climate control. It does seem like I have to adjust the temperature setting on my 2010 G37 considerably more then on my previous vehicles, where I would basically set the temperature and forget it.
On the plus side the air cools the car down fast and when I have to adjust the temperature it is usually because it gets too cold.
I've put a little over 6,000 miles on the G, so far and have had zero problems, which is the main reason I opted for a G37 over a BMW 335i.

[clague]

I know exactly what you mean! I passed on my 2006 Lexus RX330 to my girlfriend and bought a 2010 G37x. In the RX330, I also set it at 74 and almost NEVER touched it. Maybe a couple of times a year. In the G37, I'm adjusting the temperature multiple times a day, and huge swings.. from 68 to 78. Same problem as you... it over cools when it's hot out, and under cools when it's cooler out. I think it's just the difference in how the system detects and adjusts. The Lexus was all about feel... everything was gradual and consistent. The Infiniti is a little more aggressive and seems to overreact. Oh well, a minor inconvenience, but definitely contributes to the lack of polish on the fit and finish of the car. Other than that, I haven't really had any complaints with it though, and it's a blast to drive.

I traded a Lexus IS350 for my 2010 G37. In the Lexus (with auto climate, like the G37), I set the temperature to 74 and never touched it - it gave me a comfortable temperature when it was 95 outside or 55. Now, with the G37, it seems I am changing the temperature setting all the time. The car sits in the sun at work, and the outside temperature can get up to 95 or higher (SFV location in SoCal). The AC is amazing - it cools down immediately, but to get a comfortable temperature, I have to set the temperature control to 78 or higher. Next morning, when I start out and the outside temperature is 65, I have to set the temperature control down to 70 or the heat comes on! Is the temperature control (over) reacting to the outside temperature - or is the inside temperature sensor getting over-heated when the car sits in the sun? Anyone else have this experience? Maybe I need to talk to the dealer service department.

David

[epmeyer50]

Having similar experiences with the '09 G37s sedan. Auto AC setting is just not right. On previous Infinitis I could set it to 75 and forget it. Same with the Acura TL. On this one though it just keeps getting colder. I shouldn't have to manually take it off recirc - its supposed to take care of that automatically.

The wife has cranked her side up to 85 for cooling and still complains that its too cold. I've thought about recalibrating it, but last winter, it seemed the heat was about right.

[Tim30250]

My '09 is the same way. I usually fluctuate the setting between 72 and 78 depending on time of day to get a comfortable temperature. It was very annoying at first, but after 10 months I'm completely used to it.

[timmy0257]

My '09 is the same way. I usually fluctuate the setting between 72 and 78 depending on time of day to get a comfortable temperature. It was very annoying at first, but after 10 months I'm completely used to it.

I havent ran my AC at all here in N. Fla. this week. Its been beautiful lately.

my temp regulation is pretty wacky also. i stay between 72-78 as well.