Vehicle AC isn't working? Often, when the air conditioner in your car isn't working, a schrader valve is leaking or loose. I'll show you how to replace a schrader valve stem on a vehicle air conditioner system. Over time, the O rings on schrader valves get old and brittle and allow the refrigerant to pass through the schrader valve, service port and service port cap, so the AC system loses refrigerant. As a result, the air conditioner won't blow cold or won't work at all.
