Thermostat issue?

Howdy,

Recently have ran into what I think is a thermostat issue.

Temp gauge creeps up to 3/4 after about running at 20000 rpm for about 20mins. At one point I had coolant overflowing from the reservoir. Never overheats. For a couple drives I’d rev up to 3-4 rpm and the temp gauge would go to half. Never towing.

Took it to the dealership and they couldn’t “replicate” the issue despite me telling them how to recreate the issue.

Im gonna start with replacing the thermostat but figured I’d ask if anybody has had a similar issue?

Dealership said no leaks and water pump is operating appropriately. Fan is flowing fine with no resistance.

I’m a bit perplexed but think I’m gonna start with thermostat replacement.

Thank you in advance.

 

Check your radiator cap first and make sure it didn't physically fail and lose the bottom of itself. You can search about that. If it did, you need to find the other piece. If not, the tstat is pretty straight forward and easy.

 

Copy - thank you. Will report back

 

Seems to be pointing toward the Tstat. I just replaced mine with an OEM unit as part of a rad replacement and a preventative measure. The one I replaced appeared to be original, and I was surprised at how well it looked. The OEM one is a quality piece, but spendy - CAN$116.
A while back I also replaced the rad cap and as mentioned, the gasket had come loose. Luckily, I caught it in time.