Kia Troubleshooting Questions? Ask a Mechanic
Hello I will help,
Is it only leaking under vacuum?
How much is it leaking? A whiff or is it streaming out?
Let me know so I can help
The valve is not available from KIA but the valve port is the same one the dye was installed in so it is common for it to be filled with dye.
Have you inspeced the water dischage hose to see if it is leaking out there/
The cap is the primary seal and the valve core in the port is the secondary so it is possible to see dye in the port but a sniffer would not detect any leakage with the cap installed.
Let me know how I can help, if you present the valve to a NAPA dealer they might be able to match it but KIA does not make it available though their network.