Overheating warning
Drifting
Joined: Feb 2005
Posts: 1,445
Likes: 173
From: San Jose Ca
IMHO, if you are at 220* just cruising down the highway, you already have some sort of problem before it goes to 260*. If the temp reading is legit, then you probably have air in the system or a thermostat problem. My guess is either a bad temp sensor or a bad thermostat, although taking a shot at burping the system would be a good idea as well.
Race Director
Joined: Apr 2014
Posts: 10,404
Likes: 1,707
From: North Texas
No kidding. I was comparing to my car which normally ran 186 - 195 on the highway depending on ambient.
Racer
Joined: Sep 1999
Posts: 421
Likes: 13
From: Gansevoort NY
F4
This happened to me just the other day for the first time.
Wife and I were in Newport RI for little vaca, lots of slow city driving and I could hear the rolling fan screaming all the time, ac on and windows down. On our way home we got stuck in a traffic jam outside Hartford for 50 minutes and no issue overheating.
Got to Albany and got stuck in another for 15 minutes and all of a sudden the AC shuts off and I get a message on the dash that "ac shut off due to overheating'. I pulled over and pooped the hood found no leaks and nothing blocking the radiator. Got thru the jam and the minute I hit normal road speed the gauge dropped back top normal in less than a mile. When I stopped I realized that my fan that was screaming in city traffic the day before was not running at all....thus the overheat.
There are some old post on this forum about turning the car off and opening the door and then restarting to reset the fan. You'll never get this to happen at the dealer so don't waste your time with them. My son works at a shop and he tells me there are numerous TSB's about overheating on C7's.
My car is back to normal and the next time I'll know to just shut it off open the door etc.
This happened to me just the other day for the first time.
Wife and I were in Newport RI for little vaca, lots of slow city driving and I could hear the rolling fan screaming all the time, ac on and windows down. On our way home we got stuck in a traffic jam outside Hartford for 50 minutes and no issue overheating.
Got to Albany and got stuck in another for 15 minutes and all of a sudden the AC shuts off and I get a message on the dash that "ac shut off due to overheating'. I pulled over and pooped the hood found no leaks and nothing blocking the radiator. Got thru the jam and the minute I hit normal road speed the gauge dropped back top normal in less than a mile. When I stopped I realized that my fan that was screaming in city traffic the day before was not running at all....thus the overheat.
There are some old post on this forum about turning the car off and opening the door and then restarting to reset the fan. You'll never get this to happen at the dealer so don't waste your time with them. My son works at a shop and he tells me there are numerous TSB's about overheating on C7's.
My car is back to normal and the next time I'll know to just shut it off open the door etc.
Team Owner
Joined: Sep 2010
Posts: 32,042
Likes: 4,610
My Vette is a 2014 with Z51 and a 7M transmissio and 121,000 miles. Thank you all for your suggestions, but they don't really address the the very temporary and intermittent nature of my problem. I can sometimes drive 200 highway miles with no problem. Or I can drive 10 miles and the temperature gauge can quickly (20 seconds or so) go from 220° to past 260°. If I ease up and put it in a higher gear, it can just as quickly go back to 220° and stay there.
I'm thinkin' this. ^^^
Safety Car
Joined: Dec 2012
Posts: 3,841
Likes: 1,856
From: St. Louis Metro East IL
F4
This happened to me just the other day for the first time.
Wife and I were in Newport RI for little vaca, lots of slow city driving and I could hear the rolling fan screaming all the time, ac on and windows down. On our way home we got stuck in a traffic jam outside Hartford for 50 minutes and no issue overheating.
Got to Albany and got stuck in another for 15 minutes and all of a sudden the AC shuts off and I get a message on the dash that "ac shut off due to overheating'. I pulled over and pooped the hood found no leaks and nothing blocking the radiator. Got thru the jam and the minute I hit normal road speed the gauge dropped back top normal in less than a mile. When I stopped I realized that my fan that was screaming in city traffic the day before was not running at all....thus the overheat.
There are some old post on this forum about turning the car off and opening the door and then restarting to reset the fan. You'll never get this to happen at the dealer so don't waste your time with them. My son works at a shop and he tells me there are numerous TSB's about overheating on C7's.
My car is back to normal and the next time I'll know to just shut it off open the door etc.
This happened to me just the other day for the first time.
Wife and I were in Newport RI for little vaca, lots of slow city driving and I could hear the rolling fan screaming all the time, ac on and windows down. On our way home we got stuck in a traffic jam outside Hartford for 50 minutes and no issue overheating.
Got to Albany and got stuck in another for 15 minutes and all of a sudden the AC shuts off and I get a message on the dash that "ac shut off due to overheating'. I pulled over and pooped the hood found no leaks and nothing blocking the radiator. Got thru the jam and the minute I hit normal road speed the gauge dropped back top normal in less than a mile. When I stopped I realized that my fan that was screaming in city traffic the day before was not running at all....thus the overheat.
There are some old post on this forum about turning the car off and opening the door and then restarting to reset the fan. You'll never get this to happen at the dealer so don't waste your time with them. My son works at a shop and he tells me there are numerous TSB's about overheating on C7's.
My car is back to normal and the next time I'll know to just shut it off open the door etc.
You have a 2014 which was known to have radiator fan controller issues. This is likely your problem since you did NOT hear the fan running when the car was overheating. The fix is to replace the fan which has an integral controller .
radiator fan controller
GL
Ron
