Nissan 370Z Forum - View Single Post

Itsuka · 02-11-2015, 06:03 PM

Hi all, I am a new member and just like to say hi and at the same time like to hear your opinions about this issue I am having. I've had a look at other threads but i can't seem to find the answer i am looking for, and other threads don't to seem to have as much detail as i would like in the findings.

I just recently purchased a 370z and just recently did my 1000kms (621miles) service/check and I had a concern in which I brought up with the dealer in which they replied was normal. They didn’t seem confident with their answer so I am asking you guys for your experience and knowledge.

After driving the car for a while (20 mins from cold start) and once the oil temperature warms up I noticed that the air from the vents start to get warmer as well is this normal? These are my settings and findings.

AC-Off
Fresh Air (not circulated)
Temp set to coldest 18c (64.4f) degrees

In all the other cars I have ever been in, under the above circumstances the air from the vents should be very similar to the air temperature outside. I compare this by opening the window, putting my hand out to feel the breeze and then placing my hand in front of the vent, temperature has always been very similar, regardless to freeway driving or stop start traffic.

I’ve noticed that as the oil temperature rises from 90c (194f) to 105c (221f), so does the warmth in the air from the vents (more evident on hotter days), note that the above settings have not change. This happens regardless when the air outside is 20c (68f) degrees or 35c (95f) degrees but in stop start traffic.

But this morning I was driving in stop start traffic, oil temp was 105c (221f) degrees outside temp was 20c (68f) degrees and warm air poured out of the vents, BUT once I jumped onto the freeway and drove for a 5-10 mins the oil temp dropped to 92c (197.6f) degrees and the air from the vent matched the air outside the car (it has cooled down significantly).

Now one would argue that the outside air has cool engine by passing through the grill and radiator, but on a 35c degree day, when I drive down the same freeway at the same speeds with no traffic the oil temp would remain at 105c degrees and the air from the vents would be warm. But the weird part is if I turn on the AC on a 35c degree day the oil temp would drop to 95c degree and remain their regardless if it is freeway driving or stop start traffic. Since the engine would be under more load I would assume it should be hotter correct? Also if the argument is that the fans are constantly ON then what about when I drive on the freeway? I am sure that air pushing through the radiator at 100kms would be much stronger than the fans on the radiator.

I guess my question is, do you believe that keeping the oil temp to 90c degrees would solve the warm air issues from the vent? As I like to drive with windows up and AC off when the temperature permits. If so do you think an oil cooler would help in this instance would a larger radiator?

What have you experienced? Sorry about the long winded question but I really appreciate your help and opinions.

Cheers!

02-11-2015, 06:03 PM	#1 (permalink)
Itsuka Base Member Join Date: Jan 2015 Location: down under Posts: 3 Drives: 370 Rep Power: 11	Please Help, warm air from vents Hi all, I am a new member and just like to say hi and at the same time like to hear your opinions about this issue I am having. I've had a look at other threads but i can't seem to find the answer i am looking for, and other threads don't to seem to have as much detail as i would like in the findings. I just recently purchased a 370z and just recently did my 1000kms (621miles) service/check and I had a concern in which I brought up with the dealer in which they replied was normal. They didn’t seem confident with their answer so I am asking you guys for your experience and knowledge. After driving the car for a while (20 mins from cold start) and once the oil temperature warms up I noticed that the air from the vents start to get warmer as well is this normal? These are my settings and findings. AC-Off Fresh Air (not circulated) Temp set to coldest 18c (64.4f) degrees In all the other cars I have ever been in, under the above circumstances the air from the vents should be very similar to the air temperature outside. I compare this by opening the window, putting my hand out to feel the breeze and then placing my hand in front of the vent, temperature has always been very similar, regardless to freeway driving or stop start traffic. I’ve noticed that as the oil temperature rises from 90c (194f) to 105c (221f), so does the warmth in the air from the vents (more evident on hotter days), note that the above settings have not change. This happens regardless when the air outside is 20c (68f) degrees or 35c (95f) degrees but in stop start traffic. But this morning I was driving in stop start traffic, oil temp was 105c (221f) degrees outside temp was 20c (68f) degrees and warm air poured out of the vents, BUT once I jumped onto the freeway and drove for a 5-10 mins the oil temp dropped to 92c (197.6f) degrees and the air from the vent matched the air outside the car (it has cooled down significantly). Now one would argue that the outside air has cool engine by passing through the grill and radiator, but on a 35c degree day, when I drive down the same freeway at the same speeds with no traffic the oil temp would remain at 105c degrees and the air from the vents would be warm. But the weird part is if I turn on the AC on a 35c degree day the oil temp would drop to 95c degree and remain their regardless if it is freeway driving or stop start traffic. Since the engine would be under more load I would assume it should be hotter correct? Also if the argument is that the fans are constantly ON then what about when I drive on the freeway? I am sure that air pushing through the radiator at 100kms would be much stronger than the fans on the radiator. I guess my question is, do you believe that keeping the oil temp to 90c degrees would solve the warm air issues from the vent? As I like to drive with windows up and AC off when the temperature permits. If so do you think an oil cooler would help in this instance would a larger radiator? What have you experienced? Sorry about the long winded question but I really appreciate your help and opinions. Cheers!