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Overheating issue, any ideas?

Old 06-13-2018, 05:15 PM
  #21  
Tool Hoarder
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Anyone actually figure out the cause? Mine just crossed 50K miles and just started this on Hotrod Power Tour and I had to bail. Only does it after 30+ min on highway at higher speed. Restart fixed it. Zero issues side roads driving, only after 30 min highway. Just bought Z06 fan assembly which will have a new PWM controller on the harness.
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Old 06-13-2018, 05:35 PM
  #22  
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I have still had zero issues since upgrading thermostat and radiator fan, drove in stop and go 100 degree Houston traffic, couldn’t be a better test than that.
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Old 06-14-2018, 09:25 AM
  #23  
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My '14 Z51 overheated after a 3 hour road trip while entering a traffic jam at S.A. My car was towed to local Chevy dealer, electrical fan and water pump replaced under warranty. Problem gone. Good job from Cavender chevy at Boerne, TX.

Last edited by 911Hunter; 06-14-2018 at 09:26 AM.
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Old 06-14-2018, 11:29 AM
  #24  
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Old 06-15-2018, 07:51 PM
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Originally Posted by 911Hunter View Post
My '14 Z51 overheated after a 3 hour road trip while entering a traffic jam at S.A. My car was towed to local Chevy dealer, electrical fan and water pump replaced under warranty. Problem gone. Good job from Cavender chevy at Boerne, TX.

Do you have part numbers for those two items?

Elmer
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Old 06-16-2018, 12:37 AM
  #26  
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No Sir. But maybe by using your VIN on those GM parts web pages you will find yours.
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Old 06-16-2018, 09:25 AM
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Well, my VIN is for a 2014 Z51 and not the Z06 so I'm not sure a search by my VIN will give me the Z06 part numbers. Thanks anyhow for the response.

Elmer
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Old 06-16-2018, 10:28 AM
  #28  
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Old 06-16-2018, 10:46 AM
  #29  
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Originally Posted by Tool Hoarder View Post
Perfect! Going into my cheatsheet of information.

Thanks.

Elmer
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Old 06-16-2018, 01:10 PM
  #30  
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Sounds like bad fan motors! No need to upgrade. Just replace the fan!
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Old 06-18-2018, 04:36 PM
  #31  
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Originally Posted by BrunoTheMellow View Post
Sounds like bad fan motors! No need to upgrade. Just replace the fan!
It's not the motor, it's the PWM controller. And the whole part only comes as an assembly.

Z06 fan is going in my car tomorrow.
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Old 06-20-2018, 12:31 PM
  #32  
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Picked up car today... you can hear the fan more for sure as it's higher power/speed. Haven't had a chance to do a 30 minute highway run to see if it's truly 100% fixed.
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Old 11-26-2018, 08:55 AM
  #33  
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Default '15 Z-51 overheat problem

Thanks to 911Hunter for the info, makes sense!
I experienced my first overheat problem this weekend with my 15 Z-51. EXACTLY as everyone else has described. Traveling from Clearwater to Miami, ran like a champ until I hit congestion in Miami on I-75 and then the overheating, and coolant overflow. Restart wasn't possible. Battery died within an hour of waiting for tow (showed up 3 hours later)
Towed to dealer and the first thing was a new battery. They kept the car running for over two hours no coolant leaks, drove it, still no coolant leaks and eventually told me the low battery was causing the bogus overheating and low oil signals.

Driving back to Clearwater Saturday no issues until I hit congestion 3 hours into the drive, and sure enough the temp guage started climbing fast and I got the overheating warning. Pulled off for a 30 minute lunch, restarted and have had no more issues. WTF!!!

Hate to have to replace the thermostat and fan as 911hunter did, but if that's the only option.....
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Old 11-26-2018, 10:27 AM
  #34  
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It doesn't take a break of a large amount of time. My last over heating episode was nothing more than, pull over out of traffic, turn off motor, open door to lose the RAP power, close door, restart, temperature drops like a rock, drive away. A quick restart will correct the problem until the next time the problem needs correcting. As I said, I'm waiting for one more hit of this issue and then the fan gets replaced.


Elmer
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Old 11-26-2018, 12:18 PM
  #35  
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I had the same issues. with my 14. I replaced the thermostat and the Radiator and i havent had a issue since.
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Old 11-26-2018, 12:24 PM
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Originally Posted by Bruce_K View Post
I had the same issues. with my 14. I replaced the thermostat and the Radiator and i havent had a issue since.

T-stat and radiator? Not the fan?

Elmer
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Old 11-26-2018, 12:29 PM
  #37  
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Yup, same factory fan. I havent had a issue since. I read somewhere that the radiator tend to get clogged.
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Old 11-26-2018, 12:37 PM
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Originally Posted by Bruce_K View Post
Yup, same factory fan. I havent had a issue since. I read somewhere that the radiator tend to get clogged.

Hm... I would buy that answer but a clogged radiator would stay clogged and a simple restart of the motor wouldn't change that. The fact that my fan was not running and screaming in an attempt to cool the coolant seems to say "fan" or fan controller. As soon as I restart the car, my fan starts and the temperature goes down like a rock falling.

ELmer
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Old 11-26-2018, 12:39 PM
  #39  
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Mines would do the same, but i would restart and it would continue to over heat. the fans would be screaming. but could be a different issue.
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Old 11-26-2018, 12:43 PM
  #40  
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Originally Posted by Bruce_K View Post
Mines would do the same, but i would restart and it would continue to over heat. the fans would be screaming. but could be a different issue.
Ok, so your fans were running. Ok, I can buy a clogged radiator or t-stat issue. My fans were dead, nada, zilch, nuttin'. Restart the car and the fans spin up to max to get the car cool.

Sounds like a different issue.

Elmer
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