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Great posting YellowJacket! Sean as you can see from pic. 2 the water pump pulls on the thermostat and if it's weak can suck it open when you rev to full throttle. Your temp gauge will drop like a rock and heater will blast cold air (in the winter).
While they are a few dollars more I wouldn't recommend anything but Toyota. I have a lot of non "Toyota" parts on my car, but the thermostat will always be OEM.
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