Did you do this? I'm interested in doing it too... would be interested in knowing how you did it. Thanks!

Replace the thermostat. Even if it might not have failed, you'll never know if it does or not because there's no CEL or error code produced from it. Check all hoses for dryness, cracking, rips etc. And keep an eye on the water pump if you haven't changed it yet

This is backwards. The T-stat will throw a code and will illuminate the SES light, so you will know when it goes bad. But "going bad" only means the heating element has failed in it, the t-stat will still operate properly. The only way to "keep an eye" on the waterpump is to scan the ECU for shadow codes that indicate a slow waterpump speed, which do not illuminate the SES. Once you find the code for a slow waterpump it means the pump is on the way out.

Thanks for the correction!

I wouldn't sweat the thermostat by its self. Most electric water pumps die eventually.... And as preventative maintenance I would replace the pump and thermostat at the same time you drain the coolant with that type of mileage.

Yes, expensive but its better than being stranded somewhere when you don't want to