Under Hood Heat

Bad Scott

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I own a 2021 Rubicon with a 2.0L Turbo engine. I took my Jeep for a short 15-20 mile ride and when I came home I decided to check the oil. When I opened the hood I nearly burned my hand on the underside of the hood reinforcement near the front of the hood. Is this normal? I know turbos run hot, but this seems excessive. There are vents on the Rubicon hood, but I don't know if they are functional as there is a hood insulator on the inside of the hood covering these vent features.
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BDinTX

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Yeah our cooling systems work harder than an ugly hooker. I've burned myself a couple times trying to pull the prop rod down. I did cut holes in the insulation and the bottom of the fake vents. I didn't do a before test to see if it's helped but when sitting you can definitely feel hot air coming out. Other folks have tested and this is a low pressure area so it should also be drawing out heat while moving.
 
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Bad Scott

Bad Scott

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Yeah our cooling systems work harder than an ugly hooker. I've burned myself a couple times trying to pull the prop rod down. I did cut holes in the insulation and the bottom of the fake vents. I didn't do a before test to see if it's helped but when sitting you can definitely feel hot air coming out. Other folks have tested and this is a low pressure area so it should also be drawing out heat while moving.
Hi Brad, We've chatted on other posts. Thanks for the reply. So from what you are saying, the vents actually do go all of the way through?
 

WilhelmSR

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Hi Brad, We've chatted on other posts. Thanks for the reply. So from what you are saying, the vents actually do go all of the way through?
Vents do not go all the way through. You have to cut the liner and the bottom base on the vent/s
 

sourdough

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Or if you are a DIYer just pull the sound liner, top engine cover and extend the hood hinges. It works very well venting under hood heat. Caution! some folks are critical of the adjustment to looks and don't understand, "its a JEEP thing" Haha It costs next to nothing to do and if you are not into it. It's very easy to undo. Cuting the hoodliner and drilling holes in the fake hood vents is a one way modification.
JL underhood.jpeg
jl hood hinge extension 1.jpeg
jl hood hinge extention 2.jpeg
JL hood with hinge extensions.jpeg

BTW, carriage head bolts with the nuts on the inside of engine bay replaced the hexhead bolts. No cowl vent cover intrusion. And about the under hood sound liner that started in the 50's, has any manufacturer ever stated it was for hood paint protection?
 
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BDinTX

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Hi Brad, We've chatted on other posts. Thanks for the reply. So from what you are saying, the vents actually do go all of the way through?
yep you bet!
The vent inserts are normally blocked off with a small opening towards the front. Any water gettin in would drain through that to the top of the fiber board looking heat shield and drain off to the side. (Blue circle and red circle respectively)
00457AED-6938-4232-B176-BEB6675D4DAB.jpeg

I didn’t cut the entire bottom out of the vent because I wanted to maintain some side to side rigidity. Hoping that would make it less likely to pop out while on the freeway.
43D545BF-8F5F-4C1D-8A27-5DB17A3944F0.jpeg

Then of course the fiber board shield has also been cut out.

folks that aren’t a fan of this usually cite concerns of water entering the engine compartment. I’m not saying anyone should do this just that I did it.
 
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Bad Scott

Bad Scott

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Or if you are a DIYer just pull the sound liner, top engine cover and extend the hood hinges. It works very well venting under hood heat. Caution! some folks are critical of the adjustment to looks and don't understand, "its a JEEP thing" Haha It costs next to nothing to do and if you are not into it. It's very easy to undo. Cuting the hoodliner and drilling holes in the fake hood vents is a one way modification.
JL underhood.jpeg
jl hood hinge extension 1.jpeg
jl hood hinge extention 2.jpeg
JL hood with hinge extensions.jpeg
Thanks Strider. Very innovative and out-of-the-box Imagineering! Improves aerodynamics as well.
 
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Bad Scott

Bad Scott

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yep you bet!
The vent inserts are normally blocked off with a small opening towards the front. Any water gettin in would drain through that to the top of the fiber board looking heat shield and drain off to the side. (Blue circle and red circle respectively)
00457AED-6938-4232-B176-BEB6675D4DAB.jpeg

I didn’t cut the entire bottom out of the vent because I wanted to maintain some side to side rigidity. Hoping that would make it less likely to pop out while on the freeway.
43D545BF-8F5F-4C1D-8A27-5DB17A3944F0.jpeg

Then of course the fiber board shield has also been cut out.

folks that aren’t a fan of this usually cite concerns of water entering the engine compartment. I’m not saying anyone should do this just that I did it.
OK thanks Brad. If it works for you, all the more power to ya! I just can't believe the product development team allowed such high engine compartment temperatures and ignored the issue by installing fake vents. I wonder if there are any aftermarket ad-ons to address this issue...Hmmm.
 

BDinTX

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OK thanks Brad. If it works for you, all the more power to ya! I just can't believe the product development team allowed such high engine compartment temperatures and ignored the issue by installing fake vents. I wonder if there are any aftermarket ad-ons to address this issue...Hmmm.
Ya I figured it was worth a shot. If I had problems I could buy new vents and heat shield then make a warranty claim. ; )

There are some aftermarket louvers and even plastic scoops but I'm pretty sure the scoops are pushing air in when we want air coming out.

@sourdough 's solution is probably the most effective tbh
 

BDinTX

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Side note, and I know this is kinda petty on my part… but this really ticks me off:
476ED3EA-E9E0-4341-99A8-A92983016CA9.jpeg

In my opinion that is a flat out marketing lie.
 
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