Having problems with your 2003 Pontiac Sunfire ?
Thermostat location - 2003 Pontiac Sunfire
The thermostat should either be at the water pump\015\012or at the housing at the engine end of the upper radiator hose.
Follow the upper radiator hose to the engine, where the hose will be attached to a flanged fitting. The thermostat is usually located there.
Repair Help & Product Troubleshooting for 2003 Pontiac Sunfire
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