Hi all. Was hoping to get some advice as I had an (unusual to me) overheating issue this past weekend in my 2014 base w/ z51. I apologize in advance as I'm not the most mechanically inclined person but I'm trying to learn as I go.

I took a day trip to the beach and after roughly a 1.5 hour long drive I hit a decent amount of traffic. I'm assuming the stop and go, combined with 95 degree, high humidity weather contributed to the engine overheating - turn off engine warning light to appear on my dash. I immediately pulled the vehicle over and saw steam from underneath the hood. I popped the hood and noticed what looked to be boiling coolant flowing out of a small tube from underneath the coolant reservoir tank. The car dumped roughly a half gallon of coolant onto the street before it stopped flowing. I let the motor sit and cool off - popped the cap off the same reservoir tank and poured in about 3/4s of a gallon of water (nothing leaked out afterwards). I had no overheating issues after that and was able to drive the vehicle back home at around 200-205 temp the entire way.

Is it possible my coolant was so low that it boiled and this was some sort of pressure release? Admittedly it's been a very long time since I checked the coolant so it may have been lower than it should be. Once it was home I drove it a little harder and saw no temperature issues whatsoever but I'm wondering what my next steps should be to prevent this/damage in the future?

 

A little easy reading for you.
https://www.corvetteforum.com/forums...-to-260-a.html

AND


https://www.corvetteforum.com/forums...any-ideas.html


Elmer

A C7 that only overheats in stop-and-go traffic conditions can be caused by:
- Bad radiator fan motor
- Bad control module for the fan motor (located next to the fan motor)
- Bad 80A fuse for the fan motor (I think this is a bolt-in fuse (not a regular plug-in fuse)) located in the Aux Power Distribution/Fuse panel, which is located between the regular underhood fuse/relay panel and the coolant tank. It has a white plastic cover.
- Bad ground wire connection, or +12V feed wire connection, to the fan control module & fan motor.
- A bad PCM, which sends the fan speed control signal to the fan control module, or a bad wire connection of this signal to the fan control module. The PCM sends the fan speed control signal based on the engine coolant temp sensor, but if the sensor fails, the PCM commands the fan to full-speed, as a fail-safe strategy.

A bad thermostat, or low coolant level, or blocked radiator airflow (debris) will cause the car to overheat in all driving speed/conditions.


Elmer

 

The 2014 C7s have an issue with the cooling fan. They will intermittently stop working when in traffic and cause the car to overheat. The quick solution is to turn the car off and back on and that seems to reset the fan and it starts working again. I know of one that didn't cause any issues for 3 years and then started intermittently failing. One solution for the problem is to purchase and install the 600 watt fan that is used in the C7Z.

Bill

 

Thank you both very much for the quick replies and you are both spot on. That is EXACTLY what happened to me down to the scenario..... 1.5 hour drive to the island on the highway, once I got to the island, hit traffic, car overheated, turned it off and had no issues afterwards. This forum is the best!