I got my first 100 miles on my 2023 c8 - what a fun car.

Issues & Questions
1) The frunk (front trunk) requires two hands to push shut, whereas the back hood gets pulled closed automatically. I am worried closing the frunk I will dent the hood pushing to close it - is this normal?

2) I have the beefed up suspension & cooling - the dealer left a bag in the trunk with the brake cooling package - they tell me that is an owner install, is that correct?

3) The infotainment system is paired via bluetooth running Wayze navigation. Initially, everything thing worked. I was prompted to take an update, and now Wayze does not open as navigation. When I tap Wayze on my phone it says to check the cars screen - there is no prompt. I don't see any apps on the vehicle only ones the infotainment system will let me download.I also can access Amazon music after the update.

 

1. Use the palms of both hands to reduce the contact stress if this worries you. Go slow to the first click and then the second. You will not dent the hood unless you use a hammer.
2. The upper rear brake ducts are to be dealer installed. Mine screwed that one up so I installed it myself but you need a good jack (I used a Quickjack). In the bag are instructions. Read these and these will clearly indicate exactly what the dealer is paid to install. The only parts not to install are the lower rear ducts.
3. I have not used Waze but I do use Google Maps on an Apple iPhone. When you lose connection, reboot the phone and then use the Infotainment screen to scan for your phone again via Bluetooth. Be patient; it will come back.

 

Regarding question 3 - look at the following - it may be helpful:
Post 16 at this thread: https://www.corvetteforum.com/forums...post1605798044
Post 50 at this thread: https://www.corvetteforum.com/forums...post1605671091

I was answering a different question in those posts, but they both discuss the required connections and how to verify the set up on the car and phone screens. You do have to have both Bluetooth and WiFi enable on your phone - both connections are required to support car play. When it is set up you will have carplay icon on the car screen. If you then select car play, you will see the carplay screen showing the apps on your phone that can be used from the car screen. One of them will be Waze.

 

It is common for many dealers to say the brake ducts are for track only/owner installation, even though we're into the 4th model year. The truth is that the four large pieces that mount on the rear lower control arms are for track use only (they hang too low for street driving), but the front ducts and the two pieces of upper rear ducts are to be installed at PDI on all cars. I had to fight with my CD dealer and threaten to kick it up to his GM factory rep to get mine installed. Others have just accepted this BS story, The dealer is paid for the PDI, which includes installing these ducts. Don't let them tell you any differently.

 

Brake ducts are for track use only.
READ THE MANUAL and stop giving incorrect advice

 

The advice given in posts 2 and 4 (and quoted below) about the brake cooling ducts is correct. While its true that one should read the manual, the 2023 manual discusses installation and removal of the lower rear brake brake ducts for tracking. It illustrates the front brake ducts. It does not discuss which parts are dealer installed during pdi. See attached paragraph from the manual. The dealer installs the front brake ducts and the upper portion of the rear brake ducts. The lower rear parts are delivered in the trunk in a bag, with instructions (if done properly). See a clip from tech link on this.

https://cimg8.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/2000x535/screenshot_2023_04_14_085440_6af6a178b7c ecdbd61f53769c06f837e7020be85.png

 

You can install the upper halves without a problem and THAT IS WHAT is WRITTEN the the GODDAMNED instructions that come with the parts. Read the F'n instructions!

 

I never said READ the MANUAL. That was the other guy.

 

Yes, he did. Sorry. Thanks for pointing it out. I have deleted that post now. Your advice was correct - which you already knew.

 

Thanks all for the information.
I was able to get Wayze working again - Oddly enough another reboot on my cell phone did the trick. What I was seeing when I opened Android Auto on the Screen and only the Infotainment Chevy Nav opened. Amazon Music and all other apps were missing from Android auto.

I have been using two hands to close the front hood - but it is a very firm second push to close. Perhaps Chevy will add an auto close like they did with back hood, to help keep Fingerprints \ hand prints off the car. I am sure that is not the intent of the auto close, but it is nice.

Sounds like the fight with the dealer is probably not worth the energy to get them to install the front brake coolers.

 

I am looking at the instructions now. I see where it mentions that the rear lower control arm cooling ducts are not to be dealer-installed during PDI [PDI is to skip steps 6-8]. But where, as you state above, do the instructions say you "can" install the upper halves, if desired?

 

So the PDI involves installing the uppers only (for highway use). The upper halves can stay on forever as they will not catch road debris.

GM tech link : https://gm-techlink.com/?p=12879
"Install the brake cooling deflectors (Fig. 27), except the rear lower control arm brake cooling ducts."

https://www.corvetteblogger.com/2020...e-pdi-process/
"it appears that some service technicians skipped the required reading and were either installing everything that came with the car, or installing none of the pieces as required during the Pre-Delivery Inspection."
also
"Those lower rear Z51 brake ducts are only supposed to be installed for track use, however, the upper rear Z51 brake ducts should be installed during PDI according to a GM spokesperson."

Dealers not doing this are hosing their clients.

 

You are mis-reading. Where it says except the rear lower control arm brake cooling ducts it is referring to the LOWER control arm not the lower half of the duct. You are not to install the duct which includes the upper and lower halves. For the sake of argument, one could hold that it is OK to install the upper half of the duct, however nowhere in the GM procedure does it say that this is OK.

 

You have misinterpreted the instructions.
Read this:
https://www.corvetteblogger.com/2020...e-pdi-process/

By the way; there are no cooling duct pieces at all for the upper control arm.

 

Yes, but there are Rear Knuckle Mounted Cooling Duct LH 84781211 and Rear Knuckle Mounted Cooling Duct RH 84781211 that are dealer installed (in step 5). I have attached also the illustration from the kit instructions showing the installation of the Rear Knuckle Mounted Cooling Duct in step 5 which is part of what the dealer installs.


Start by reviewing the parts list and parts numbers on page on where you will see these parts:

Front Lower Control Arm Deflector LH 84781213

Front lower Control Arm Deflector RH 8478214

Rear Knuckle Mounted Cooling Duct LH 84781211

Rear Knuckle Mounted Cooling Duct RH 84781212

Rear Lower Control Arm Cooling Duct LH (consisting of two part numbers for upper and lower half) 84926351 and 84926352

Rear Lower Control Arm Cooling Duct RH (consisting of two part numbers for upper and lower half) 84926052 and 84926053

Bottom line is that the dealer is supposed to install the items in green which does include part of the rear cooling duct. You should have 4 parts left in the bag when the car is delivered (the ones in red above). And that is what my dealer, Criswell did.

In the kit instructions, step 2 install LH and RH Front Lower Control Arm Deflectors (part numbers 84781213 and 8478214).

Step 5 installs the Rear Knuckle Mounted Cooling Duct LH 84781211 and Rear Knuckle Mounted Cooling Duct RH 84781212.

That’s it for dealer installed parts. The instructions say steps 6-9 are not dealer installed, and that is where both the upper and the lower halves of the rear lower control arm ducts are installed.

Step 7 installs (secures) the LH and RH upper halves of the rear lower control arm ducts to the rear upper control arm 84926351 and 84926352.

Step 8 installs (secures the LH and RH lower halves of the rear upper control arm ducts 84926052 and 84926053.

The Corvette blogger article may or may not differ from these instructions - its hard to tell because they did not refer to the specific part numbers or names. But the actual quote in the article from the GMs spokesman was

“During the 2020 Stingray Z51 pre-delivery inspection, the lower and upper front rubber brake intake cooling ducts and the upper rear brake intake duct shall be installed on every Z51 C8.” Also as specified in the PDI, “the cooling ducts attached to the lower rear control arm are for track use only and should not be installed during the PDI.”

But if that quote is to be consistent with the instructions then the reference to upper rear brake intake duct must mean the Rear Knuckle Mounted Cooling Duct LH 84781211 and Rear Knuckle Mounted Cooling Duct RH 84781212 (identified as part 3 in the illustration they used in the article). And to be consistent with the kit instructions the reference to the the cooling ducts attached to the lower rear control arm must mean both the upper and lower halves of the rear lower control arm cooling ducts 84926351/ 84926352 and 84926052/ 84926053 (part 4 in the illustration they used in the article).

The next part in the blogger article is not a GM statement and it says "If you have a 2020 Z51 in the driveway, now may be a good time to make a visual inspection to ensure your required Z51 brake ducts were installed while the two optional lower rear brake ducts are not. At the very least, confirm that you have only two ducts remaining in the bag that was given to you at delivery".

I can't speak for what they meant, but to be consistent with the kit instructions, the references to "two ducts" must mean both the upper and lower halves of those two ducts.

There is a little bit of evidence for that interpretation. The illustration that they used in that article (which is from page 153 and 154 of the 2020 manual) shows the rear component. In that illustration they use the correct names for the parts - and you can see that part 3 is called Rear Knuckle Mounted Cooling Duct. And that is the part that the kit instructions say the dealer installs in step 5. Part 4 is called the Rear Lower Control Arm Cooling Duct - and it pictures both the upper and lower halves as number 4. The kit instructions say those part are not dealer installed (steps 6-9).

 

Here is what is installed at the rear for street use. The upper half is flush with the under panels and will not get ripped off nor catch debris that could cause a fire. The lower half is attached for track use.

 

Yup. What is installed in this picture are the Rear Knuckle Mounted Cooling Duct which is installed in step 5 of the kit instructions, and the upper half of the rear lower control arm duct which is installed in step 7 of the kit instructions. And here is step 7 showing installation of the upper half of the duct.

 

And since the instructions explicitly advise to skip step 7, then even the top half of the duct should not be installed. It is not a question of whether installing the upper half will be okay. The instructions do not state that this step is optional for street use.

 

The exact wording in the instructions is "Steps 6-9 below (Rear Lower Control Arm Duct) are not dealer installed for highway use , only to be installed prior to any track use track event or competitive driving. Remove the rear lower control arm cooling ducts after track use." And the parts list shows the the Rear Lower Control Arm Cooling Duct consists of two part, the upper and lower half. The instructions could have said "remove both the upper and lower half", or they could have said "only remove the lower half" for street use, but they don't. And it does not appear that there is any harm in leaving the upper half in place.




It is also consistent with the instructions in the manual, which say "Install the rear lower control arm cooling ducts per the instructions included with the kit. After any track event or competitive driving, remove the rear lower control arm cooling ducts." And the the illustration shows an arrow pointing to part # 4 (which shows the entire duct, not just the lower half of the duct) and the caption refers to part 4 as the "4. Rear Lower Control Arm Cooling Duct". The large arrow pointing to part 4, by the way, is part of the original illustration in the manual - I did not add that. Again, it could have mentioned that the duct actually consists of two parts and both should be removed or that it consists of two parts but only the lower half needs to be removed. But it does not say either one. One thing that is clear is the the Rear Knuckle Mounted (part 3 in the manual) remains in place for street use.

 

I can't believe this is still a point of contention in the 4th model year of the C8. I had to fight with my dealer and threaten to escalate at GM before he finally installed the rear upper cooling ducts. You would think by now that someone would get GM to publish clarification of their instructions. This argument is going on at dealers all across the country and the customer is the ultimate loser.