AC high pressure Schrader valve leak

Need help. I have replaced all components for my ac except for the evaporator and high pressure line and switch last year. Worked for a year and now I have a leak at the high pressure Schrader valve. I have replaced the valve four times now and it continues to leak.

 

How about the expansion valve at the firewall? If the compressor went bad, that is probably ruined as well. Good place to check for debris or sludge that indicates a compressor failure, and debris can ruin all the valves. And go to a tech that can do a refrigerant capture and before checking the expansion valve. Not to mention a really thorough gauge and vent temp calibration.

 

There is a tool that is a captive system that will allow you to replace your core without needing to evacuate the entire system.

$20 SURIEEN R134A Valve Core Quick Remover Installer Tool Set, AC High Low Pressure Valve Core Remover Tools Kit for R134A Refrigerant Air Conditioner System

This looks like the tool I'm talking about, but you might be able to rent it from your local auto parts store. It should allow you to pull the valve core and seal the system enabling you to replace with a new core. Use a little dab of PAG oil on the rubber before installing the new core. It might help you fix your leak. Valve cores are cheaper than a complete flush.

Edit: I see that you replaced it 4x already, are you sure you used the correct valve core?

-J

 

I think it’s always a good idea when you replace those Schrader valves let them soak in a cap full of pag oil a bit. You don’t know how long they been laying around somewhere. Lube em up.