How To Replace Thermostat on
2003-2007 Toyota Corolla

With strong winds, snow and cold temperatures, it's important to make sure your vehicle is in top shape to face the harsh winter weather. From replacing your blower motor to replacing the thermostat in your car the PartSource Parts Pros are here to help.

Every vehicle is different. When it comes to maintenance and repairs, always follow the vehicle's owner's manual.

Safety should be your number one priority. Don't smoke, drink alcoholic beverages, or wear a necktie while working on the car. Watch out for hot objects, sharp instruments, hazardous materials and other potential safety hazards in and around your workspace.

Don't work with a Philips when the job calls for a flat. Substituting tools can compromise your safety or your vehicle's performance.

Finally, when the fun turns to frustration, or if the job requires specialized knowledge beyond your capabilities, please do not attempt it yourself. Talk to a Parts Pro or seek the assistance of a professional mechanic or installer. The last thing we want is someone getting hurt.

Removal
	Disconnect the negative battery cable.
	Remove the engine under cover from the right hand side.
	Drain the coolant.
	Remove the serpentine belt.
	Disconnect the wire clamp from the wire clip on the rectifier end frame.
	Remove the rubber end cap and nut.
	Disconnect the alternator wire.
	Disconnect the alternator connector.
	Remove the alternator mounting bolts.
	Remove the alternator assembly.
	Remove the water outlet bolts.
	Remove the water outlet.
	Remove the thermostat.
	Remove and clean the old gasket and any sealant from the water outlet housing.
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Installation
	Install new thermostat gasket.
	Install the new thermostat.
	Install the water outlet.
	Torque water outlet bolts to 11 N.m or 8ft.lbs.
	Install the alternator.
	Torque 12mm head bolt to 25 N.m or 18ft.lbs.
	Torque 14mm head bolt to 54 N.m or 39ft.lbs.
	Add coolant.
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While your @ it

• You may want to change your serpentine belt
• Do a coolant system flush