Car over heating.

Markoz28 · 05-23-2019, 10:41 AM

Car is a 2018 ZL1 A10. Over heated today going 75 just cruising. Car is at the dealership right now. The fans come on but the temps rise pretty high with reduced engine power coming on. Any ideas?

History: car has kooks ceramic coated no cats, 9.1 pulley, RF intake, 160 thermostat. I’m wondering if the thermostat is stuck and not flowing. There is plenty of fluid. Oil looks good too with recent oil change about 2k miles ago.

Scottyz · 05-23-2019, 11:13 AM

Was it boiling over?
Maybe the temp sensor is messed up.

2018ZL1 · 05-23-2019, 11:18 AM

Quote:

Originally Posted by Markoz28

Car is a 2018 ZL1 A10. Over heated today going 75 just cruising. Car is at the dealership right now. The fans come on but the temps rise pretty high with reduced engine power coming on. Any ideas?

History: car has kooks ceramic coated no cats, 9.1 pulley, RF intake, 160 thermostat. I’m wondering if the thermostat is stuck and not flowing. There is plenty of fluid. Oil looks good too with recent oil change about 2k miles ago.

Have you been driving it with the mods for a while now? The reason I ask is because maybe there is an air pocket in the system? I pretty much have the same car and mods other than the thermostat change with no issue.

Markoz28 · 05-23-2019, 11:39 AM

Mods were done about 3k miles ago. No problems at all. After pulling over and letting it cool down I drove it to the dealer about 3 miles away and watched the temps climb from 170 to 210 in about 2 minutes. I pulled over about 1 mile from dealer, turned it off and the fans were running. After a couple of minutes the fans turned off and I started up again. Once pulling into the dealer the temp was at 215 and I shut it down. I don’t think the coolant is circulating so maybe thermostat or water pump. Could also be air in the system but I have no experience with that.

unavailablezl1 · 05-23-2019, 12:01 PM

It really does sound like a faulty thermostat that got changed. In my lifetime, this has happened to me. It opens, but not all the way. The best way to test it yourself, if you want to, is to boil it and watch what it does. That's what I did and it just opened halfway.

AZ_1LE · 05-23-2019, 12:03 PM

These engines are really sensitive to air pockets in the system, and it has a lot of places for air to get trapped. They basically put the system under vacuum before introducing coolant, and it is a lengthy process to get all of the air out. Wouldn't surprise me that that's all it is.

Murika · 05-23-2019, 12:33 PM

My 16 z06 had the exact same thing happen.

Failed mishimoto 160* thermostat. The rubber ring fell out of the grove. Once I replaced it, it overheated again and after pulling the water pump (it was fine) I replaced the tensioner. That fixed it up.

I'm not sure if the thermostat failed first, or if the tensior failed first and caused the thermostat to fail.

LT4Greg · 05-23-2019, 01:04 PM

I wish you luck on getting your modded Camaro worked on at a dealership. I’m surprised they will even look at it but hopefully there is a tech there that finds out the cause of the overheating. Good luck!

SJFGTO · 05-23-2019, 02:11 PM

My wild guess is an air pocket. Just did a 2000 mile road trip with similar mods to yours. Temp only exceeded 185 once, stuck in a traffic jam on a warm day it briefly climbed to 195 and the settled back to 185. Air pocket issue is my guess.

Artos · 05-23-2019, 03:03 PM

Well that stinks Mark...wanna race??

Markoz28 · 05-23-2019, 03:42 PM

Quote:

Originally Posted by Artos

Well that stinks Mark...wanna race??

Lol! Not right now.

Hope to hear some good news later today.

Artos · 05-23-2019, 04:45 PM

Let me know...got the lockout kit & all the bolts needed, pending the BMR upper / lower / trailing arms & those will be here early next week.

Hoping to have everything installed in the next couple of weeks.

Markoz28 · 05-25-2019, 10:15 AM

So my car is still at the dealership. They tell me that the computer doesn’t say why it’s over heating. Will the computer know if the thermostat is opening or if it’s stuck? I can’t imagine there’s a sensor for that. Not sure what to do next?

1hprush · 05-25-2019, 05:07 PM

You're gonna have to pull the thermostat and see if it's working properly.

05-23-2019, 10:41 AM	#1
Markoz28 Drives: 18 ZL1 nightfall grey A10 Join Date: Apr 2018 Location: RGV Texas Posts: 1,527	Car over heating. Car is a 2018 ZL1 A10. Over heated today going 75 just cruising. Car is at the dealership right now. The fans come on but the temps rise pretty high with reduced engine power coming on. Any ideas? History: car has kooks ceramic coated no cats, 9.1 pulley, RF intake, 160 thermostat. I’m wondering if the thermostat is stuck and not flowing. There is plenty of fluid. Oil looks good too with recent oil change about 2k miles ago.

05-23-2019, 12:01 PM	#5
unavailablezl1 Drives: 2019 Silverado Z71 6.2L A10 Join Date: Mar 2017 Location: Grapevine Posts: 2,075	It really does sound like a faulty thermostat that got changed. In my lifetime, this has happened to me. It opens, but not all the way. The best way to test it yourself, if you want to, is to boil it and watch what it does. That's what I did and it just opened halfway. __________________ Current ride 2019 Silverado Z71 LTZ 6.2L L87 425hp A10, 4 inch BDS Lift with Fox Factory Race 2.5 Coilovers, Borla Cat back (15HP bump), BFG KM3's 33's. Past Rides 2017 M6 Camaro ZL1 Hyper Blue 2016 M6 GT350 White with blue strips 2014 M6 Mustang GT Premium Track Pack Ruby Red 2012 M6 M3 Melbourne Red Metallic

05-23-2019, 12:03 PM	#6
AZ_1LE Drives: 2019 ZL1 1LE Join Date: Feb 2017 Location: Gilbert, AZ Posts: 645	These engines are really sensitive to air pockets in the system, and it has a lot of places for air to get trapped. They basically put the system under vacuum before introducing coolant, and it is a lengthy process to get all of the air out. Wouldn't surprise me that that's all it is. __________________ Old: 2017 SS 1LE Old: 2017 ZL1 Current: 2019 ZL1 1LE

05-23-2019, 01:04 PM	#8
LT4Greg Drives: 2017 Camaro ZL1 Coupe Join Date: May 2016 Location: Georgia Posts: 5,811	I wish you luck on getting your modded Camaro worked on at a dealership. I’m surprised they will even look at it but hopefully there is a tech there that finds out the cause of the overheating. Good luck! __________________ ZL1 Coupe, PDR, Exposed carbon fiber hood insert, My Link with Nav, M6 6 speed and Silver Ice Metallic. Mods done: ceramic window tint, GM Accessories Camaro floor mats and Roto-Fab CAI.

05-23-2019, 02:11 PM	#9
SJFGTO Oh Oh it's Friday Night! Drives: 2018 ZL1 1LE Nightfall Gray Join Date: Jan 2018 Location: Walton Woods Posts: 1,061	My wild guess is an air pocket. Just did a 2000 mile road trip with similar mods to yours. Temp only exceeded 185 once, stuck in a traffic jam on a warm day it briefly climbed to 195 and the settled back to 185. Air pocket issue is my guess. __________________ 2018 Camaro ZL1 1LE NFG; ARH 2” headers, catless mids, ARH full exhaust, Lingenfelter 18% lower pulley, ATI Harmonic Balancer, Roto-fab CAI, EE-catch can, TM ported TB, NX Lid, BMR strut tower brace. Aeroforce dual pod interceptor gauges. Tuned by Vengeance Racing!!! 644 HP @ 6250 rpm / 689 trq @ 3660 rpm Four that wanna own me Two that wanna stone me One says she's a friend of mine...

05-23-2019, 11:13 AM	#2
Scottyz 2019 ZL1 1LE MY GOON Drives: 1980 Z28 Big Red. Join Date: Dec 2018 Location: Stoney Creek Posts: 2,061	Was it boiling over? Maybe the temp sensor is messed up.

05-23-2019, 11:39 AM	#4
Markoz28 Drives: 18 ZL1 nightfall grey A10 Join Date: Apr 2018 Location: RGV Texas Posts: 1,527	Mods were done about 3k miles ago. No problems at all. After pulling over and letting it cool down I drove it to the dealer about 3 miles away and watched the temps climb from 170 to 210 in about 2 minutes. I pulled over about 1 mile from dealer, turned it off and the fans were running. After a couple of minutes the fans turned off and I started up again. Once pulling into the dealer the temp was at 215 and I shut it down. I don’t think the coolant is circulating so maybe thermostat or water pump. Could also be air in the system but I have no experience with that.

05-23-2019, 12:33 PM	#7
Murika Drives: 2017 ZL1 Join Date: May 2019 Location: Tampa, FL Posts: 1	My 16 z06 had the exact same thing happen. Failed mishimoto 160* thermostat. The rubber ring fell out of the grove. Once I replaced it, it overheated again and after pulling the water pump (it was fine) I replaced the tensioner. That fixed it up. I'm not sure if the thermostat failed first, or if the tensior failed first and caused the thermostat to fail.

05-23-2019, 03:03 PM	#10
Artos Drives: A10 LT4 Join Date: Aug 2016 Location: Deep South TX Posts: 1,094	Well that stinks Mark...wanna race??

05-23-2019, 04:45 PM	#12
Artos Drives: A10 LT4 Join Date: Aug 2016 Location: Deep South TX Posts: 1,094	Let me know...got the lockout kit & all the bolts needed, pending the BMR upper / lower / trailing arms & those will be here early next week. Hoping to have everything installed in the next couple of weeks.

05-25-2019, 10:15 AM	#13
Markoz28 Drives: 18 ZL1 nightfall grey A10 Join Date: Apr 2018 Location: RGV Texas Posts: 1,527	So my car is still at the dealership. They tell me that the computer doesn’t say why it’s over heating. Will the computer know if the thermostat is opening or if it’s stuck? I can’t imagine there’s a sensor for that. Not sure what to do next?

05-25-2019, 05:07 PM	#14
1hprush 2018 ZL1 1LE Drives: 2018 ZL1 1LE Join Date: Aug 2017 Location: Westfield, IN Posts: 1,010	You're gonna have to pull the thermostat and see if it's working properly.

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