No heat or very little heat

trace the upper radiater hose back to engine. Where this hose connects to engine is called the "thermostat housing" thermostats are usually located under these or their extensions. The first thing I would check when I have a "low heat" situation, is the connections where the heater hoses connect to the engine for rust and corrosion, or clogged heater hoses or heater core cloggs.

change the thermostat it located at the engines lower raid hose to block below the a/c compressor one hose and two bolts using a10mm socket

Check fluid level in radiator first. If it is full try putting a piece of cardboard in front of radiator and see if it heats up. If that solves the problem most likely the thermostat. Follow the big upper radiator hose back to the engine and the thermostat should be located there under the thermostat housing.

Follow the lower radiator hose to the engine. The place where the hose mates the engine is the thermostat housing, and of course, the thermostat is inside it. Another reason for rapid temperature increase is that the electric radiator fans are not turning on when the engine reaches normal operating temperature.

follow the top hose from the radiator. it connects to the thermostat housing. a stuck thermostat will make the vehicule overheat but check anti-freeze level first

Follow the hoses leading from the radiator to the block -- upper hose first. Where the hose connects to the block there is a housing -- the thermostat is in that housing.

Follow the top radiator hose.

follow top radiator hose from radiator to engine wear hose ends, it will be clamped to whats called the gooseneck, thermostat is under that. you will have to drain coolant, not all, maybe 1 half gal. before you remove it. 2 bolts new gasget new thermostat, just remember spring on new thermostat goes in engine.

The thermostat housing is located by grabbing the upper radiator hose, and following it back to the engine block.
The housing that the hose is connected to is the thermostat housing.
Changing the thermostat will fix your problem!

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Follow the lower radiator hose to the engine. Most Toyota's along this year model have the thermostat located in the engine, where the lower radiator hose connects to the engine. Changing the thermostat is pretty straight forward. Refilling is a little trickier. Search the top of the engine and find the bleeder screw for the cooling system. Open this bleeder screw, usually a 10mm, or 12mm socket will fit, and fill the cooling system with the recommended coolant. Pay attention to your mixing ratio as well.