Takes forever for engine to cool down

[ferrethouse]

Hi all,

I picked up my 5.0 last night and I drove it for about 30km before parking it in the garage at 9pm. At 11pm I opened the garage door and it was like a sauna. I popped the hood and I could barely touch the engine cover it was so hot. I moved the car to the driveway and left the hood open and by 12:30am it was still warm but noticeably cooler.

I had an 09 4.6 liter and don't recall anything like this. I did notice the engine bay is packed solid and has lots of noise dampening insulation which probably keeps it hot much longer.

Has anyone else noticed this? Is it normal?

Thanks!

 

[Mark_888]

What model year is it?

 

[ferrethouse]

2015 Genesis Sedan 5.0

I should note that the engine didn't actually over heat according to the dash display. It was still one bar less than half way after two hours though (which is also what it typically stays at while driving).

It was also 33 degrees C yesterday which wouldn't have helped.

 

[Mark_888]

2015 Genesis Sedan 5.0

I should note that the engine didn't actually over heat according to the dash display. It was still one bar less than half way after two hours though (which is also what it typically stays at while driving).

It was also 33 degrees C yesterday which wouldn't have helped.

I am guessing that 33 C is pretty hot, but I am too lazy to do the conversion to F. Don't you have to post everything in English and French?

 

[ferrethouse]

I am guessing that 33 C is pretty hot, but I am too lazy to do the conversion to F. Don't you have to post everything in English and French?

lol. It is about 85-90 F I believe. Pretty hot for my part of the world.

 

[ferrethouse]

Took it into the service department and they said it was normal. I guess the new direct injection engine runs at a higher temperature than my 09 did. Combined with the sound insulation and lack of air circulation in my garage 2-3 hours and still hot is normal.

 

[Breadmen]

Took it into the service department and they said it was normal. I guess the new direct injection engine runs at a higher temperature than my 09 did. Combined with the sound insulation and lack of air circulation in my garage 2-3 hours and still hot is normal.

Same thing with my 3.8 AWD. Hood is still VERY warm HOURS after I come home.

I do know that EPA pollution and CAFE MPG requirements are getting tougher each year and with it the engines ARE running cleaner, leaner and HOTTER. Even Harley Davidson is having trouble with engine heat management on their air cooled V-Twin engines and went to LIQUID cooled exhaust heads as part of their "Project Rushmore" bike/engine redesign on some of their high end models this year.

 

[Billylou]

Hi all,

I picked up my 5.0 last night and I drove it for about 30km before parking it in the garage at 9pm. At 11pm I opened the garage door and it was like a sauna. I popped the hood and I could barely touch the engine cover it was so hot. I moved the car to the driveway and left the hood open and by 12:30am it was still warm but noticeably cooler.

I had an 09 4.6 liter and don't recall anything like this. I did notice the engine bay is packed solid and has lots of noise dampening insulation which probably keeps it hot much longer.

Has anyone else noticed this? Is it normal?

Thanks!

My concern that that very high under hood temperatures will break down the oil, causing premature wear leading to engine noise and shortened engine life.

In the summer, I've noticed the under hood temperature to be very high for many hours after shutdown on my 2016 3.8 AWD Ultimate no matter where it is parked.

But it's no wonder with:
- the continuous hood seal and
- the full under body-pan ... I can't see how there is any chance for the heat to escape once the radiator fan stops.

So that begs the question: Has anyone considered running the radiator fan after engine shutdown. It could be stopped on a timer or by a temperature sensor sensing coolant temperature under trigger point .
Many years ago I recall hearing fans running on cars in parking lots after the car had been turned off. Why not try this now? The battery certainly has the capacity !!

 

[Mr. Incredible]

My concern that that very high under hood temperatures will break down the oil, causing premature wear leading to engine noise and shortened engine life.

In the summer, I've noticed the under hood temperature to be very high for many hours after shutdown on my 2016 3.8 AWD Ultimate no matter where it is parked.

But it's no wonder with:
- the continuous hood seal and
- the full under body-pan ... I can't see how there is any chance for the heat to escape once the radiator fan stops.

So that begs the question: Has anyone considered running the radiator fan after engine shutdown. It could be stopped on a timer or by a temperature sensor sensing coolant temperature under trigger point .
Many years ago I recall hearing fans running on cars in parking lots after the car had been turned off. Why not try this now? The battery certainly has the capacity !!

setup a house box fan in front of the grille put it on a timer to shut off automatically.. done deal. been doing this for years with my hot rods, gets them cooled down rather quickly.. I hate closing the garage with a hot car in it.. bleeds into the house during the summer and makes the AC work harder especially with a wife and kid that regularly "forget" to close the walk through door from the kitchen to the garage. "i can't hear the laundry buzzer if the door is closed"

 

[EdP]

setup a house box fan in front of the grille put it on a timer to shut off automatically.. done deal. been doing this for years with my hot rods, gets them cooled down rather quickly.. I hate closing the garage with a hot car in it.. bleeds into the house during the summer and makes the AC work harder especially with a wife and kid that regularly "forget" to close the walk through door from the kitchen to the garage. "i can't hear the laundry buzzer if the door is closed"

My neighbor put in a roof vent and fan for the same reason. Garage can get warm here on a 90+ day.

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[Mr. Incredible]

My neighbor put in a roof vent and fan for the same reason. Garage can get warm here on a 90+ day.

yeah have 2 solar powered vents in the garage, they have a thermostat. Over 80 and the suck out the hot air, Pointless though if the doors are left open.

 

[ntmehan]

My concern that that very high under hood temperatures will break down the oil, causing premature wear leading to engine noise and shortened engine life.

In the summer, I've noticed the under hood temperature to be very high for many hours after shutdown on my 2016 3.8 AWD Ultimate no matter where it is parked.

But it's no wonder with:
- the continuous hood seal and
- the full under body-pan ... I can't see how there is any chance for the heat to escape once the radiator fan stops.

So that begs the question: Has anyone considered running the radiator fan after engine shutdown. It could be stopped on a timer or by a temperature sensor sensing coolant temperature under trigger point .
Many years ago I recall hearing fans running on cars in parking lots after the car had been turned off. Why not try this now? The battery certainly has the capacity !!

Mine is always super hot too, apparently this is common on (at least) all Hyundai/Genesis/Kia cars without econobox engines. Nothing to worry about, I had some overheating issues a few months ago, due to a small and intermittent coolant leak that was forcing coolant temps up. Once I parked in the garage, on a particularly hot day, and the condenser fans stayed on for about 30 seconds while the coolant temp dropped below the normal range. (Still indicated normal on the gauge.) Assuming electronics are working correctly, they've got all modern solutions for this stuff. I usually open the garage door about 6" when it's hot like that (unfortunately my house faces west, so even closed, the garage roasts on a hot sunny day) to allow the heat to vent once the sun dips behind other houses in the neighborhood.

All that to say, if your coolant temps are indicated normal at shutdown, the heat retention of the engine bay is not going to break down modern oils, or cause you any undue issues. (If modern synthetics can sit against turbo bearings without affecting performance and oil change interval frequency, then they're certianly well suited to deal with any hot spots in our NA engines, GDI or not.) It's actually a bit of a plus when you fire up hours later with a still mostly warm engine (no high idle, no intentional warming of the catalyst), and keeps some quick thermal expansion/shock from occurring.

 

[princelybug]

setup a house box fan in front of the grille put it on a timer to shut off automatically.. done deal. been doing this for years with my hot rods, gets them cooled down rather quickly.. I hate closing the garage with a hot car in it.. bleeds into the house during the summer and makes the AC work harder especially with a wife and kid that regularly "forget" to close the walk through door from the kitchen to the garage. "i can't hear the laundry buzzer if the door is closed"

So it's not just my home?

 

[Mr. Incredible]

So it's not just my home?

Nope.. first world issues I guess.

 

[Kraig Wilkinson]

My concern that that very high under hood temperatures will break down the oil, causing premature wear leading to engine noise and shortened engine life.

In the summer, I've noticed the under hood temperature to be very high for many hours after shutdown on my 2016 3.8 AWD Ultimate no matter where it is parked.

But it's no wonder with:
- the continuous hood seal and
- the full under body-pan ... I can't see how there is any chance for the heat to escape once the radiator fan stops.

So that begs the question: Has anyone considered running the radiator fan after engine shutdown. It could be stopped on a timer or by a temperature sensor sensing coolant temperature under trigger point .
Many years ago I recall hearing fans running on cars in parking lots after the car had been turned off. Why not try this now? The battery certainly has the capacity !!

setup a house box fan in front of the grille put it on a timer to shut off automatically.. done deal. been doing this for years with my hot rods, gets them cooled down rather quickly.. I hate closing the garage with a hot car in it.. bleeds into the house during the summer and makes the AC work harder especially with a wife and kid that regularly "forget" to close the walk through door from the kitchen to the

Mine is always super hot too, apparently this is common on (at least) all Hyundai/Genesis/Kia cars without econobox engines. Nothing to worry about, I had some overheating issues a few months ago, due to a small and intermittent coolant leak that was forcing coolant temps up. Once I parked in the garage, on a particularly hot day, and the condenser fans stayed on for about 30 seconds while the coolant temp dropped below the normal range. (Still indicated normal on the gauge.) Assuming electronics are working correctly, they've got all modern solutions for this stuff. I usually open the garage door about 6" when it's hot like that (unfortunately my house faces west, so even closed, the garage roasts on a hot sunny day) to allow the heat to vent once the sun dips behind other houses in the neighborhood.

All that to say, if your coolant temps are indicated normal at shutdown, the heat retention of the engine bay is not going to break down modern oils, or cause you any undue issues. (If modern synthetics can sit against turbo bearings without affecting performance and oil change interval frequency, then they're certianly well suited to deal with any hot spots in our NA engines, GDI or not.) It's actually a bit of a plus when you fire up hours later with a still mostly warm engine (no high idle, no intentional warming of the catalyst), and keeps some quick thermal expansion/shock from occurring.

I can come out 24 hours later and the engine is still warm to the touch. It works to my favor in the winter time, helps warm up the garage.