Nothing to do with the thermostat, everything to do with changing the coolant on the recommended* basis (or sooner).
The "green" coolant is NOT long-life and recommended to be changed more often than the "yellow". But even the 'long-life' requires changing no longer than 5 years.
NOTE: Both these coolant types are mentioned in the Owners Manuals.
If your radiator isnt leaking and car is having a over heating problem and coolant spewing out. Chances are your thermostat needs replaced. possible the radiator needs to be flushed. But more likley its thermostat
change your thermostat.
Check the water pump
have you flushed your radiator or changed the thermostat it could be stuck
cooling system needs flushed out and a new thermostat installed, also if the radiator is still original it probably needs replaced or rodded out.
More than likely it needs a new thermostat and the radiator back flushed.
I have the same issue. I have heard getting the radiator flushed might help. Otherwise look to the thermostat.
Bad thermostat maybe?
bad thermostat, bad waterpump, plugged radiator, or the cooling system is filthy and needs flushed out.
It could be one of many things.......radiator fans notworking/low on coolant/stuck thermostat/ radiator may need to be flushed......
Could be your electric fan on the radiator is shot, or the relay is bad.
Water pump defective.