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Re Mazda Demio LADW3W 605451 trouble not heating up think cud be therm staying open. Cannot locate Therm housing thought would be at either top or bottom hose goes into engine block? Can you help please regards Tony

You should be able to locate the thermostat housing by following the top or bottom hose back to the engine block.

If you have no luck, take the car to your local garage or Mazda dealership and they will be able to point out where the thermostat is located.