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Turkish
Nef
Lifted off the web:
“Checking thermostat operation:
On some vehicle models, it’s easy to diagnose a thermostat.
Make sure the engine is cool.
Engage the parking brake.
Set the transmission to Park (automatic) or Neutral (manual).
Start and idle the engine.
Pop the hood open.
Remove the radiator cap.
Take a look though the radiator opening.
Coolant should not flow at this point until the engine begins to reach operating temperature, usually in about 15 to 20 minutes.
If coolant is flowing with the engine cool, the thermostat is stuck open and needs to be replaced.”