Question about 2003 Toyota Matrix

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How to replace the thermostat

When I turn the air switch the air comes out cold.

Even after the engine has been running for a while the air is cold.

I checked the coolant fluid and it is full.

How to replace the thermostat?

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First drain the radiator of some coolant to the point where it won't spill over because you will be removing the radiator hose near the radiator cap. remove the hose. the thermostat housing is located at the end of the hose. remove the housing. then remove the thermostat. when removing the housing notice how the thermostat is installed. And be sure to have a new gasket with the thermostat. Remove all residue from the housing and the engine and put some grease to hold the new gasket in place. The replace the thermostat making sure it fits flush with the housing so you won't break the housing when reinstalling the bolts. Replace the hose and refill with coolant. Start the engine to make sure no leaks are present.

Posted on Nov 26, 2008

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Heater not blowing hot air


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No heat air is blowing cold


First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced.
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is worm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest to flush the heater core.

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