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The C8 - Convertible's upper engine body panel has 3-vents that release engine heat to the outside. Those vents also lead into the Trunk. Though, there is a trunk hood seal that should channel this heat from entering the Trunk, that's not happening. The convertible trunk design is different than the hardtop. The engine heat is actually channeled around the top of the trunk. - It is much worse than the Hardtop trunk heat issue. - This makes no engineering sense. - Does anyone have any ideas to resolve this issues? - Thanks.
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- C8 - Convertible engine hood with 3-vents.
. - Rear engine vent with direct access to trunk
. - Engine compartment vent with direct access to trunk. - Left side - Though, it has a hood seal, notice channel around upper trunk that allows heat to flow through.
. - Engine compartment vent with direct access to trunk. - Right side - Though, it has a hood seal, notice channel around upper trunk that allows heat to flow through trunk.
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Last edited by GreenScreen; 08-27-2021 at 02:34 PM.
I took a trip to sunny Palm Springs CA in July. Temperature was only 113*. Yes, I found that the ice in my cooler in the trunk melted. I came home and installed some of the A/C house duct foil insulation under the trunk insert as shown on some previous posts. That may keep some heat from under side and engine side from getting to the trunk. But a lot of heat came thru the deck lid itself I feel. I will have to look at what you are referring to in this post.
Edit: the way the deflectors are sloped over the engine, the air flow is directed up and over the trunk lid it would seem to me.
I posted essentially the same photos in another thread about trunk temperature. Not so much to suggest that it was the source of heat but rather to show that air (and water) would flow around the outside of the trunk seal, around the sides, down and out the vents on bumper. You can see daylight if you look down along the sides toward the rear. But as to whether this air is actually hot or cold, at speed, is not necessarily obvious (at least to me). As some have done, and there are kits for it, you can insulate the trunk from the exhaust heat that is running around the sides. But others have pointed out that unless there is a way for the heat to escape, insulation only slows the transfer of heat, but it eventually still gets hot. In cars of the past, with flow through ventilation, the trunks were ventilated. I believe that the most effective way to cool the trunk down would be to find a way to introduce a small amount of fresh air flow. I dont think it would take a whole lot. I realize there are some problems to be solved, like air water separation, an the introduction of dust. But we have cabin filters, so that's feasible too. Other than ventilation, the insulation seems the only way, and hope that maybe the top and rear of the trunk provide sufficient radiation to alleviate the heat build up.
Engine heat does not appear to be able to enter the trunk from the Conv's louvers because of the rubber molding around the trunk lid - however engine heat can flow around the perimeter of the trunk lid past the lid hinges and and exits via the rear bumper louvers. I also installed insulation under the trunk carpet - since the exhaust system is directly underneath. I did not insulate the bottom side of the trunk lid, may be I will. I did purchase a temp sensor (Govee wireless from Amazon) and here in the Vegas area the trunk temp gets in to the 120's F. On the rear of the trunk, on both the L & R sided there are vent holes, but they are not vented to the outside ( I have no clue to why they are there). May be the need is to have constant outside air flowing through the trunk - ideas?
Engine heat does not appear to be able to enter the trunk from the Conv's louvers because of the rubber molding around the trunk lid - however engine heat can flow around the perimeter of the trunk lid past the lid hinges and and exits via the rear bumper louvers. I also installed insulation under the trunk carpet - since the exhaust system is directly underneath. I did not insulate the bottom side of the trunk lid, may be I will. I did purchase a temp sensor (Govee wireless from Amazon) and here in the Vegas area the trunk temp gets in to the 120's F. On the rear of the trunk, on both the L & R sided there are vent holes, but they are not vented to the outside ( I have no clue to why they are there). May be the need is to have constant outside air flowing through the trunk - ideas?
vent holes are probably a pressure release for closing the trunk.
I’m actually surprised it’s only 120. I would assume the interior gets at least that hot just sitting in a parking lot
Last edited by Majestic94; 08-27-2021 at 04:11 PM.
I was curious how hot the plastic engine cover in my HTC got when I was driving around on a hot day with the top down. I used an infrared thermometer and it was 165 degrees. Got me to thinking about what kind of adhesive is used on the headliner. I'm sure testing was done during development but over time could it start to separate from the roof panel and sag?
I was curious how hot the plastic engine cover in my HTC got when I was driving around on a hot day with the top down. I used an infrared thermometer and it was 165 degrees. Got me to thinking about what kind of adhesive is used on the headliner. I'm sure testing was done during development but over time could it start to separate from the roof panel and sag?
From some quick research I read, car interiors can get to 165 or more. I’m sure most car interiors are designed for more so perhaps the headliner would be no worse off than any other roof on any car in a hot climate.
Last edited by Majestic94; 08-27-2021 at 07:06 PM.
08-27-2021, 02:29 PM
C8 - Convertible - Trunk Extremely Hot
