Heat Venting

tlr3715 · 08-12-2014, 12:08 AM

Does anyone know how this car vents heat? There are no visible vents including any near the wiper blades like on most cars. The oil temps get upward of 220 every time I'm in traffic for more than 15 min, and one time on the GW bridge in about hour three of traffic the brake pedal started to vibrate under light pressure, which made me wonder of all the issues regarding CSC and brake failures may be due to the cars inability to remove excess heat, to the point where it boils the clutch and brake fluids.

Oddly enough I've recently discovered that turning on the AC while in traffic will actually lower my oil temps which is the opposite of most other cars I've owned.

Arrvaxx · 08-12-2014, 12:23 AM

Doesn't the Base now even come with an oil cooler? If not...get one...problem solved. It is a well known issue.

Also my brakes and several others have reported the brake vibration. Many people say we are crazy...I'm not. I'll put up a video of it. I haven't bothered to figure it out as I am going with new brakes and rotors and expect the issue to go away then.

AC lowers your temps? I'd like to see that.

tlr3715 · 08-12-2014, 12:30 AM

The oil coolers on the newer 370z are outside and in front of the radiator, so would not factor in extracting heat away from the engine bay, and is also why my oil temps get higher in traffic since there is no air moving over the external oil cooler.

I didn't believe it at first, but I've tested it a number of times now. If I keep the AC off and sit in traffic temps will hover around 220 and never drop (or will gradually increase) unless I start to move again. If I turn on the AC they will begin to drop while still sitting in traffic.

I know the Corvettes I've had would vent heat automatically through the cabin if the engine got hot enough, but it had nothing to do with having the AC on or not.

DEpointfive0 · 08-12-2014, 12:38 AM

Welcome to owning a 370Z

aszyd · 08-12-2014, 09:04 AM

Quote:

Originally Posted by tlr3715

The oil coolers on the newer 370z are outside and in front of the radiator, so would not factor in extracting heat away from the engine bay, and is also why my oil temps get higher in traffic since there is no air moving over the external oil cooler.

I didn't believe it at first, but I've tested it a number of times now. If I keep the AC off and sit in traffic temps will hover around 220 and never drop (or will gradually increase) unless I start to move again. If I turn on the AC they will begin to drop while still sitting in traffic.

I know the Corvettes I've had would vent heat automatically through the cabin if the engine got hot enough, but it had nothing to do with having the AC on or not.

The cooler in front of the radiator is actually the power steering cooler. The OEM oil cooler does not have a separate cooling core. It is plumbed into the coolant path with the rest of the engine.

theDreamer · 08-12-2014, 09:31 AM

The car does not really "vent" heat in OEM form, the hood/fender liners/etc pretty much keep it sealed. Air basically flows in via front bumper and out under the car past the front undertray.

It would seem the pressure area under the hood is between the radiator & engine, which opening that area up allows for air to flow in via the front bumper and out efficiently helping with cooling.
On the side of traffic & cooling, not much does anything. If you are stagnant in traffic you are just sucking in hot air from the concrete & exhaust gasses from other cars which becomes a never ending cycle of increased temps.

Limeybastard · 08-13-2014, 12:38 AM

I thought it vented the heat to the floor boards. My feet get really warm if the AC is not on.

roplusbee · 08-13-2014, 03:39 AM

I get heat in the cabin via the vent(s). My guess is that the hot air escapes the engine bay through that "fresh" air vent and flows into the cabin area and out my open windows, lol. It is usually hot as balls during the summer (unless I use the Air Con) and warm when it is cool/cold (last winter was brutal in TX).

Optimiser · 08-13-2014, 09:01 AM

The reason the engine cools down when the AC is on is because it switches the front (2) radiator fans on (full) moving or not .

phunk · 08-13-2014, 12:03 PM

air enters the front bumper, passes through the radiator and engine bay, and exits underneath the car. this is typical of almost all cars.

adding a real oil cooler will aid the issue. the stock "oil cooler" is just a heat exchanger that uses engine coolant. so its trying to "cool" your oil with 170+ degree water. The best the stock oil cooler could ever do if it were 100% efficient, is bring the oil to water temps. If your water temps climb from sitting in traffic, your low limit for the oil raises.

If you install a proper air/oil cooler, you have a much more ideal configuration. The factory heat exchanger can work to help bring your oil up to temp faster in the morning, and also reduce overcooling of the oil on cool days. But the additional oil cooler will maximize your ability to shed excess oil heat.

wheee! · 08-13-2014, 12:32 PM

As mentioned above, the heat pours out of the centre vent on my JP-R hood...

but a real oil cooler will help solve most people's problems with temperature.

roplusbee · 08-14-2014, 02:03 AM

I want one of those hoods.............I will have to settle for the SEIBON VS or VIS offerings though, /cry

wheee! · 08-14-2014, 08:23 AM

Quote:

Originally Posted by roplusbee

I want one of those hoods.............I will have to settle for the SEIBON VS or VIS offerings though, /cry

That is not "settling"...!

roplusbee · 08-17-2014, 12:55 PM

That SEIBON one is the one that I want with the center vent..........I guess you are right about settling, lol

Horizon · 11-16-2020, 10:30 PM

I have been looking for an answer to why the air vents blow hot air for so long, I think you might have finally put an end to my question!

08-12-2014, 12:08 AM	#1 (permalink)
tlr3715 Base Member Join Date: Aug 2013 Location: NJ Posts: 35 Drives: 2013 370Z Nismo Rep Power: 12	Heat Venting Does anyone know how this car vents heat? There are no visible vents including any near the wiper blades like on most cars. The oil temps get upward of 220 every time I'm in traffic for more than 15 min, and one time on the GW bridge in about hour three of traffic the brake pedal started to vibrate under light pressure, which made me wonder of all the issues regarding CSC and brake failures may be due to the cars inability to remove excess heat, to the point where it boils the clutch and brake fluids. Oddly enough I've recently discovered that turning on the AC while in traffic will actually lower my oil temps which is the opposite of most other cars I've owned.

08-12-2014, 12:23 AM	#2 (permalink)
Arrvaxx A True Z Fanatic Join Date: Jul 2013 Location: Whore Island, MN Posts: 1,243 Drives: 40th F.I. Twin Turbo Rep Power: 18	Doesn't the Base now even come with an oil cooler? If not...get one...problem solved. It is a well known issue. Also my brakes and several others have reported the brake vibration. Many people say we are crazy...I'm not. I'll put up a video of it. I haven't bothered to figure it out as I am going with new brakes and rotors and expect the issue to go away then. AC lowers your temps? I'd like to see that. __________________ 2010 370Z 40th Anniversary (#480 born 1/19/2010) Fast Intentions Twin Turbo \| Varis Arising II \| Limited Edition Recaro Sportster \| Tuned by Specialty Z \| 604hp 525 torque @14lbs boost on 100 octane

08-12-2014, 12:38 AM	#4 (permalink)
DEpointfive0 Premium Member Bitches Join Date: Jan 2012 Location: SoCal Posts: 14,824 Drives: a lot Rep Power: 17151	Welcome to owning a 370Z 370zrider likes this. __________________ Do YOU want to know what/where I got my username from? ( Click to show/hide ) NSFW due to language:

08-12-2014, 09:31 AM	#6 (permalink)
theDreamer A True Z Fanatic Join Date: Feb 2009 Location: Texas Posts: 30,879 Drives: 370z Rep Power: 4210	The car does not really "vent" heat in OEM form, the hood/fender liners/etc pretty much keep it sealed. Air basically flows in via front bumper and out under the car past the front undertray. It would seem the pressure area under the hood is between the radiator & engine, which opening that area up allows for air to flow in via the front bumper and out efficiently helping with cooling. On the side of traffic & cooling, not much does anything. If you are stagnant in traffic you are just sucking in hot air from the concrete & exhaust gasses from other cars which becomes a never ending cycle of increased temps. wheee! likes this. __________________ theDreamer's Z // Fast Intentions // Uprev // GTM // HKS // TEIN theDreamer's Silvia // URAS // GREDDY Houston Zs // Facebook // Twitter // Instagram

08-13-2014, 03:39 AM	#8 (permalink)
roplusbee A True Z Fanatic Join Date: Dec 2009 Location: Killeen, TX Posts: 2,360 Drives: 2007 350Z NISMO Rep Power: 22	I get heat in the cabin via the vent(s). My guess is that the hot air escapes the engine bay through that "fresh" air vent and flows into the cabin area and out my open windows, lol. It is usually hot as balls during the summer (unless I use the Air Con) and warm when it is cool/cold (last winter was brutal in TX). __________________ 2007 350Z NISMO #0618: Zerolift \| UPREV \| F.I. \| Greddy \| Competition Clutch \| Injector Dynamics \| Aeromotive \| Pioneer \| JL

08-12-2014, 12:30 AM	#3 (permalink)
tlr3715 Base Member Join Date: Aug 2013 Location: NJ Posts: 35 Drives: 2013 370Z Nismo Rep Power: 12	The oil coolers on the newer 370z are outside and in front of the radiator, so would not factor in extracting heat away from the engine bay, and is also why my oil temps get higher in traffic since there is no air moving over the external oil cooler. I didn't believe it at first, but I've tested it a number of times now. If I keep the AC off and sit in traffic temps will hover around 220 and never drop (or will gradually increase) unless I start to move again. If I turn on the AC they will begin to drop while still sitting in traffic. I know the Corvettes I've had would vent heat automatically through the cabin if the engine got hot enough, but it had nothing to do with having the AC on or not.

08-13-2014, 12:38 AM	#7 (permalink)
Limeybastard A True Z Fanatic Join Date: Apr 2014 Location: FL and London UK. Posts: 1,514 Drives: 2014 370Z Sport. Rep Power: 17	I thought it vented the heat to the floor boards. My feet get really warm if the AC is not on.

08-13-2014, 09:01 AM	#9 (permalink)
Optimiser Enthusiast Member Join Date: Mar 2013 Location: Australia Posts: 455 Drives: 2012 Nissan 370Z MT Rep Power: 20144	The reason the engine cools down when the AC is on is because it switches the front (2) radiator fans on (full) moving or not . watson853 likes this.

08-13-2014, 12:03 PM	#10 (permalink)
phunk A True Z Fanatic Join Date: Mar 2009 Location: Chicago Posts: 3,668 Drives: 370 Rep Power: 974723	air enters the front bumper, passes through the radiator and engine bay, and exits underneath the car. this is typical of almost all cars. adding a real oil cooler will aid the issue. the stock "oil cooler" is just a heat exchanger that uses engine coolant. so its trying to "cool" your oil with 170+ degree water. The best the stock oil cooler could ever do if it were 100% efficient, is bring the oil to water temps. If your water temps climb from sitting in traffic, your low limit for the oil raises. If you install a proper air/oil cooler, you have a much more ideal configuration. The factory heat exchanger can work to help bring your oil up to temp faster in the morning, and also reduce overcooling of the oil on cool days. But the additional oil cooler will maximize your ability to shed excess oil heat. wheee! and Rusty like this. __________________ Charles @ CJ Motorsports : Website \| Facebook \| Instagram \| YouTube Home of the 9 second, stock longblock, stock drivetrain 6MT 370z. 9.91 @ 142mph Last edited by phunk; 11-16-2020 at 11:13 PM.

08-13-2014, 12:32 PM	#11 (permalink)
wheee! A True Z Fanatic Join Date: Sep 2009 Location: Mod Capital of Canada Age: 57 Posts: 7,354 Drives: cars. lots of cars. Rep Power: 40182	As mentioned above, the heat pours out of the centre vent on my JP-R hood... but a real oil cooler will help solve most people's problems with temperature. __________________ H&R / Stillen / Berk / HKS / Swift / Michelin / UpRev / SPC / Amuse Rep / Seibon / Fringe XVO / TWM / more... My Journal

08-14-2014, 02:03 AM	#12 (permalink)
roplusbee A True Z Fanatic Join Date: Dec 2009 Location: Killeen, TX Posts: 2,360 Drives: 2007 350Z NISMO Rep Power: 22	I want one of those hoods.............I will have to settle for the SEIBON VS or VIS offerings though, /cry wheee! likes this. __________________ 2007 350Z NISMO #0618: Zerolift \| UPREV \| F.I. \| Greddy \| Competition Clutch \| Injector Dynamics \| Aeromotive \| Pioneer \| JL

08-17-2014, 12:55 PM	#14 (permalink)
roplusbee A True Z Fanatic Join Date: Dec 2009 Location: Killeen, TX Posts: 2,360 Drives: 2007 350Z NISMO Rep Power: 22	That SEIBON one is the one that I want with the center vent..........I guess you are right about settling, lol wheee! likes this. __________________ 2007 350Z NISMO #0618: Zerolift \| UPREV \| F.I. \| Greddy \| Competition Clutch \| Injector Dynamics \| Aeromotive \| Pioneer \| JL

11-16-2020, 10:30 PM	#15 (permalink)
Horizon Base Member Join Date: Aug 2020 Location: Bluffton, SC Posts: 47 Drives: 2012 Nismo 370z #424 Rep Power: 6715	I have been looking for an answer to why the air vents blow hot air for so long, I think you might have finally put an end to my question!

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