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Check your heater hoses for leaks, if they are fine you need to check the heater switch. The switch looks like a spring and is located on the front side of the heater core. Two screws and it comes out, if it is not broken check for water leaks. Your heater core is shot.
The right side hose coming from heater core runs into a connector. There is a hose parallel to this connector. At the end is what your looking for. If your wanting to replace this cause your heater doesnt work id recommend flushing your heater core first. My heat didnt work at all flushed it yesturday and works like a charm.
Those are the inlet and outlet hoses to your heater core. The hoses are probably a specific form fitted hose that you can get at the counter of any parts store. There is a clamp on both sides of the hoses. Remove them and then use a razor blade to cut the hoses off. Be sure the engine is cool and the radiator cap is off. Place a catch bin under the hoses because coolant will come out. put some coolant on the inside end of the new hoses to make them easier to install. Buy new clamps also. The heater core necks where the hoses attach can break unless you are gentle and careful. Trust me, you don't want to replace a heater core unless it is absolutely necessary.
Check the valve on the upper heater hose and make sure it moves,if it does then you need to have the heater core flushed.You can do it your self by removeing the heater core hoses from the heater core and runnin water through it with a garden hose but a rad shop can do a better job.If you choose to do it yourself pick up a bottle of rad cleaner first and put it in the rad a few days before you flush it.