Actual Effects of Hood Vents? - Page 2 - JeepForum.com
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post #16 of 36 Old 02-09-2012, 06:45 AM
dcorn
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I thought vents would help when driving on the beach. Nope. Overheated the Jeep and trans last year in OBX. That's with a 3-core radiator and trans cooler too.

A properly maintained cooling system will work much better than hood vents. My vents were just as much for looks as they were for cooling the engine.


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post #17 of 36 Old 02-09-2012, 06:49 AM
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I shimmed the back of the hood ... definitely cooled it down a bit. When I'm on the trail and really beating on the jeep, I can feel a substantial amount of heat coming out of the back of the engine.

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post #18 of 36 Old 02-09-2012, 10:56 AM
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Hood vents can lower the under-hood and engine temperatures.

If your cooling system overheats, you have a cooling system maintenance issue that no amount of hood vents can cure.

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post #19 of 36 Old 02-09-2012, 01:23 PM
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Quote:
Originally Posted by CJ7-Tim View Post
Hood vents can lower the under-hood and engine temperatures.

If your cooling system overheats, you have a cooling system maintenance issue that no amount of hood vents can cure.
I didn't really have problems with it running, it was when I turned it off the underhood temps would soar.

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post #20 of 36 Old 02-09-2012, 01:25 PM
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I have the same vents installed on my XJ. They really helped me a lot, living in AZ and already dealing with the heat. I noticed it kept my engine temperature more in range while at a stand still in traffic and also slowly creeping on trails.

Don't have a before and after of the engine bay temps but from the gauge on the dash it helped quite a bit. Best $30 I have spent.

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post #21 of 36 Old 02-09-2012, 06:07 PM
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I have to agree with Carves. I did NOT have any cooling issues prior to my poking holes in my hood. Therefor would not recommend this as a fix of any sort. Rather just another of many "improvements" to the original design.

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post #22 of 36 Old 02-09-2012, 10:10 PM Thread Starter
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I totally agree with that. And as I've said several times, I do not have cooling problems. Far from it actually. I'm just looking at the vents as a potential improvement, not a band-aid.
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post #23 of 36 Old 02-11-2012, 12:02 AM
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I seen in one of the ultimate adventures there was a red xj that had a e-fan mounted on the hood drawing out the hot air. i bet that makes a noticeable difference.

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post #24 of 36 Old 02-12-2012, 08:12 PM
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I just did a total overhaul of my cooling system including a 3 row radiator and have not noticed my engine running cooler/ heat reduction, the only thing I have left to do is some kind of hood vents to keep that engine bay cooler. I think that if these XJs could have been made with some type of hood ventilation the heat issues would be eliminated.
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post #25 of 36 Old 02-13-2012, 12:07 AM
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Quote:
Originally Posted by cbenez1
I have to agree with Carves. I did NOT have any cooling issues prior to my poking holes in my hood. Therefor would not recommend this as a fix of any sort. Rather just another of many "improvements" to the original design.
Same here, if it wasnt below freezing half of the year here I'd do this. My cooling system is fine, but I bet i'd see some mild improvements. My coolant temp can spike after shut down, and I'd probably shave off a few degrees running. Plus it can look great if done with taste.
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post #26 of 36 Old 02-13-2012, 06:25 AM
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Quote:
Originally Posted by joe108 View Post
I just did a total overhaul of my cooling system including a 3 row radiator and have not noticed my engine running cooler/ heat reduction, the only thing I have left to do is some kind of hood vents to keep that engine bay cooler. I think that if these XJs could have been made with some type of hood ventilation the heat issues would be eliminated.
So you replaced the thermostat/housing, water pump, and radiator? Was it overheating before? If you replaced everything with OEM type parts, you should really get much better cooling, it should just work like factory. The Jeep normally runs at around 210*. If you are substantially over that, then you have other issues and hood vents won't help.

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post #27 of 36 Old 02-13-2012, 10:46 AM
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On my XJ upon shut down (after moderate 4wheeling) my engine bay heat soaks my injectors and It throws a CEL for #3 & #4, I did the cooling system since I have no idea how long its been since the pump and hoses have been change, and wanted to make it as reliable as possible. On my last trip when we stopped on the trail, I would lift the hood up to vent the engine, and got no further misfires or CEL, and the weather was cold and snowing at the time of the CEL. So if I can find me some hood or vents that I like, I think any heat soak issues should be taken care of.
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post #28 of 36 Old 03-29-2014, 05:04 AM
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I just started working at a jeep dealer and found a new pcm update/flash that lowered my engine temp and got rid of the running rough after a hot soak. The temp gauge never runs in the middle anymore, always one notch lower and the electric fan runs more often.
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post #29 of 36 Old 03-30-2014, 04:12 AM
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So how about some more info on the PCM update??

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post #30 of 36 Old 03-31-2014, 09:04 AM
OEburntpiston
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I did some looking and found an update that almost completely cured my jeep feeling like it ran rough after driving for a while and running into a store for about ten minutes. As far as I can tell it just runs a little cooler, instead of the temp gauge being in the middle it stays to the left and the fan runs more often. I actually was thinking of installing an electric fan and using the factory switch on wire for it with a relay. It should work in theory.
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