Trunk heat mitigation
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Joined: Jan 2019
Posts: 70
Likes: 27
From: San Antonio, TX
If you're talking about heat coming from under the car you might want to try the "Block it" kit from TKO Performance, it's a set of three preformed rubber pads, 2 for behind each seat and 1 for the cargo area. They're supposed to be for road noise reduction but they should keep some of that heat out. You just lay them down on top of the carpet without removing anything.
Team Owner
Joined: Aug 2007
Posts: 136,140
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From: I live my life by 2 rules. 1) Never share everything you know. 2)
St. Jude Donor '11-'12-'13, '16-'17-'18
OP didn't get the answer he liked in the first thread he started about this so he started a second?? 
Thread Starter
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Joined: Jul 2006
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Yes, that's partly correct...what I got was a series of snarky responses but no answers, as opposed to jpena who answered. As I said, I actually USE my C7 and the amount of heat in the trunk is (1) a design fault and (2) a pain in the ***. I have to pack my duffels differently because the heat screws things up in them. So what I was looking for was a solution, not to be asked if I was carrying ice cream in my trunk. I actually got asked that.
Intermediate
Joined: Dec 2018
Posts: 46
Likes: 15
From: San Diego
After coming across noise and heat concerns on here, and having encountered the same problem with bags & such in the trunk of my '13 GT-500, I did a little search for mitigation ideas. Found plenty for the noise but only a couple for the heat. Besides the Block It kit, I found a Carbon Fiber rear heat shield (https://www.southerncarparts.com/cor...ld-p-6619.html). Not sure if either really works, but using a much thicker trunk mat in the GT-500 seemed to help a bit which kind of validates the thinking behind the Block It.
Hope this helps. Good luck!
Hope this helps. Good luck!
Burning Brakes
Joined: Jun 2015
Posts: 850
Likes: 415
I understand from your previous comments that you aren't really interested in hearing from owners who have not experienced the heat problems you have seen, but perhaps there is something unique about your particular car that causes a problem that so few others see.
Have you checked your transmission temperatures while driving? The transaxle is right under the trunk and the temperature reading can be set as a pocket gauge or accessed through the Perf mode on the DIC. Maybe it is running hotter than normal and radiating upward.
Please don't be offended by someone else saying their Vert trunk is fine. If I can spend a couple weeks in Arizona with temps reaching 120º and not melt the toothpaste in the trunk of my 2014 Vert then there may be some other reasons your car is not be able to do the same.
Best of luck!
Have you checked your transmission temperatures while driving? The transaxle is right under the trunk and the temperature reading can be set as a pocket gauge or accessed through the Perf mode on the DIC. Maybe it is running hotter than normal and radiating upward.
Please don't be offended by someone else saying their Vert trunk is fine. If I can spend a couple weeks in Arizona with temps reaching 120º and not melt the toothpaste in the trunk of my 2014 Vert then there may be some other reasons your car is not be able to do the same.
Best of luck!
Team Owner
Joined: Aug 2007
Posts: 136,140
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From: I live my life by 2 rules. 1) Never share everything you know. 2)
St. Jude Donor '11-'12-'13, '16-'17-'18
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Joined: Mar 2014
Posts: 64
Likes: 9
I have no issue with heat in my trunk - including when the outside temperature is over 100 degrees. I agree with TyBoo - perhaps it's a problem with your particular car - I did an 8 hour road trip with my 2015 without an issue, in 100 degree weather.
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Le Mans Master
Joined: Dec 2013
Posts: 5,888
Likes: 1,559
From: Calgary Alberta
Maybe. Not that I've ever heard, but I'll give you that one. But if the OP was complaining about the heat in the back of the coupe, he would have complained more about the heat up front. My point stands where the OP was obviously talking about a convertible but Defaria feels the need to call yet another member stupid.
Edit: my post doesn't make much sense now but I'll leave it here anyway.
Edit: my post doesn't make much sense now but I'll leave it here anyway.
Last edited by Woodson; Mar 14, 2019 at 06:03 PM. Reason: Defaria's offensive posts have been removed
Safety Car
Joined: Feb 2016
Posts: 4,980
Likes: 3,826
From: Bainbridge Island WA
Heat is an issue. I found out the hard way. I stored a case of wine in the trunk. Next day I found two bottles empty. The corks had literally lifted out of the bottles and spilled the wine. The only good thing about this was that it was white wine.
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Joined: Mar 2014
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That could happen in any vehicle trunk.
I had a 6 pack of soda in the back seat of my Buick Regal once, and it exploded while sitting in a parking lot in Beaverton - THAT was nasty
Instructor
Joined: Apr 2015
Posts: 226
Likes: 42
From: St-Colomban Quebec
Putting aside all the crap about calling it a trunk or not, let's face the facts.
In a Vert, it's really a trunk, which means no direct link to the cabin.
Heat comes from outside of the trunk, unless a device in the trunk is generating heat. (where is the pump for the vert-top?, could it be caught, never fully stopping and generating heat?).
Any other heat source is coming from either the sun above or mechanical below.
Lining the inside of the trunk with anything is not fixing it because the heat has already penetrated the trunk at that point.
If there truly is too much heat coming in from the outside, the only thing, though not simple, would be to line the exterior of the trunk with some reflective material. Kinda like the heat shield above mufflers.
In a Vert, it's really a trunk, which means no direct link to the cabin.
Heat comes from outside of the trunk, unless a device in the trunk is generating heat. (where is the pump for the vert-top?, could it be caught, never fully stopping and generating heat?).
Any other heat source is coming from either the sun above or mechanical below.
Lining the inside of the trunk with anything is not fixing it because the heat has already penetrated the trunk at that point.
If there truly is too much heat coming in from the outside, the only thing, though not simple, would be to line the exterior of the trunk with some reflective material. Kinda like the heat shield above mufflers.
Last edited by Aramis76; Mar 14, 2019 at 04:44 PM.
Safety Car
Joined: Feb 2016
Posts: 4,980
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From: Bainbridge Island WA
Driving it is not the issue. I drove it all day. It wasn't until I opened the very full trunk and found a couple of loose corks and empty bottles that I knew I had a problem. Thank God it wasn't red wine. It was quite relevant to me. I had 1.5 liters of liquid soaked into the carpet, the mat, and anything in contact with it, the rest of which pooled beneath.Fun times!
Team Owner
Joined: Aug 2007
Posts: 136,140
Likes: 2,432
From: I live my life by 2 rules. 1) Never share everything you know. 2)
St. Jude Donor '11-'12-'13, '16-'17-'18
Driving it is not the issue. I drove it all day. It wasn't until I opened the very full trunk and found a couple of loose corks and empty bottles that I knew I had a problem. Thank God it wasn't red wine. It was quite relevant to me. I had 1.5 liters of liquid soaked into the carpet, the mat, and anything in contact with it, the rest of which pooled beneath.Fun times!
Safety Car
Joined: Feb 2002
Posts: 3,726
Likes: 368
From: Montoursville Pa
This is what I did with My C6 ( it helped but not a cure all)
Car on jack stands drop exhaust system, remove heat shields from Tub (floor of trunk).
Removed rear wheels & tires & inner fenders
Sprayed Lizard skin heat shield (three coats) on all exposed areas
replace removed parts
Next I removed all interior trim and also applied there.
noise & heat were both reduced.quite a bit
I probably will do ‘tis to My C7 at some point
Lizard skin and gun to apply was bought from Summit Racing
Car on jack stands drop exhaust system, remove heat shields from Tub (floor of trunk).
Removed rear wheels & tires & inner fenders
Sprayed Lizard skin heat shield (three coats) on all exposed areas
replace removed parts
Next I removed all interior trim and also applied there.
noise & heat were both reduced.quite a bit
I probably will do ‘tis to My C7 at some point
Lizard skin and gun to apply was bought from Summit Racing
Team Owner
Joined: Sep 2000
Posts: 25,015
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From: Far NW 'burbs of Chicago
St. Jude Donor '13
If it makes the OP feel any better, the C7 (coupe) trunk heats up much less than our previous C5 and C6's. In those cars, you got to brush your teeth with piping warm toothpaste after a long day driving.
When we installed a Lloyd trunk mat in the C5/C6, it made only a negligible difference in temperature. Since I put the Lloyd mat in our C7 within a few days of purchase, I can't give a direct comparison but suspect that it's also minimal improvement in the C7.
The Blockit sound mat in the trunk didn't do much for noise when I used a decibel meter, I didn't check how much difference the little mats behind the seat make but I think they actually do something. I bought some self-adhesive soundproofing and plan to stick it to the bulkhead behind the seats.
For heat, the Blockit sound mat did make a noticeable difference on the C5/C6. Not huge, but noticeable. But since there is less heat in a C7, the improvement will probably be less noticeable.
Hope this helps...
When we installed a Lloyd trunk mat in the C5/C6, it made only a negligible difference in temperature. Since I put the Lloyd mat in our C7 within a few days of purchase, I can't give a direct comparison but suspect that it's also minimal improvement in the C7.
The Blockit sound mat in the trunk didn't do much for noise when I used a decibel meter, I didn't check how much difference the little mats behind the seat make but I think they actually do something. I bought some self-adhesive soundproofing and plan to stick it to the bulkhead behind the seats.
For heat, the Blockit sound mat did make a noticeable difference on the C5/C6. Not huge, but noticeable. But since there is less heat in a C7, the improvement will probably be less noticeable.
Hope this helps...
Team Owner
Joined: Apr 2013
Posts: 26,241
Likes: 4,360
From: Chirper Island
This is about a trunk, not the cargo area in the coupe. :-P
Meanwhile, I can tell you how much better the C7 temp is than than the C6.
I had a full growler of beer in my '05, and it was so hot, that in the hour it took to drive home, it burst the neck of the darn thing! It took weeks and a lot of cleaning to remedy that.
Still have that car, and it does not smell like beer anymore.
Meanwhile, I can tell you how much better the C7 temp is than than the C6.
I had a full growler of beer in my '05, and it was so hot, that in the hour it took to drive home, it burst the neck of the darn thing! It took weeks and a lot of cleaning to remedy that.
Still have that car, and it does not smell like beer anymore.
Safety Car
Joined: Dec 2009
Posts: 4,300
Likes: 3,199
From: Oro Valley Arizona
Hmm?
60K miles in our C6 convertible. Now 30K miles in our C7 drop top, We live in S. AZ where we will have a summer with 90-100 consecutive days near or above 100 F. Amid those several week long heat waves with a string of 110+ days. And never once considered heat in the trunk. Not sure why we would?
And today is 70 sunny still as a church mouse. So there is that.
And today is 70 sunny still as a church mouse. So there is that.
Last edited by papillion; Mar 15, 2019 at 03:15 PM.