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I have replaced the Schrader valve on a TSX.
You need to evacuate your system and recapture the r134a in your system first if there is still refrigerant
Then you may need a new dryer because you system has been exposed to air and moisture -it depends how bad your leak is
Swap the Schrader value with a removal/install tool.
Vacuum the system and pull out all the air, then charge the system.
Certainly watch a few youtube videos
Before you consider this you do need to find the leak. It may not be the Schrader valve as others have mentioned. You should clean off the dye, maybe charge the system again, and see where it is leaking. It could be leaking in more than one location too, -- at the valve and somewhere else.
Equipment you will need is
Schrader valve tool
Schrader valves
r134a
r134a compatible dye (incase it leaks in the future)
Scale to weigh how much refrigerant is applied
Pump and recapture system
Master gauge setup to read high and low side
You don't save much money given the equipment you have to purchase for the first time, but it is a great learning experience.
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