Service Port Valve Replacement
A/C service port valve core replacement and leak repair
Service Port Valve Replacement
The A/C service ports are the access points used to recover, vacuum, test and recharge your air conditioning system. Inside each service port is a small valve core that seals the system. If that valve leaks, refrigerant can slowly escape even when the rest of the system is healthy.
We inspect the high-pressure and low-pressure service ports, replace leaking valve cores, check the caps and seals, then retest the system to confirm the leak has been resolved.
Best used for
✓ Slow refrigerant loss from service ports.
✓ Hissing around A/C charging points
✓ UV dye or oil around valve caps
✓ Failed vacuum or pressure test near ports
✓ Preventative replacement during servicing
What is a service port valve?
Your vehicle’s air conditioning system normally has two service ports: a low-pressure port and a high-pressure port. These are used by technicians to connect A/C equipment for recovery, vacuum, leak testing and recharge.
Inside each port is a small valve core. It works like a sealed one-way access point. When the A/C equipment is connected, the valve opens. When disconnected, it should close and keep refrigerant inside the system. If the valve core wears, sticks, corrodes or becomes contaminated, it can leak.
Small part, big leak
A tiny valve core can lose enough refrigerant to stop the system cooling properly.
Common failure point
Valve cores can seep after age, previous servicing, dirt, pressure changes or worn seals.
Quick repair route
If the valve core is the issue, replacement is usually much cheaper than major part repair.
A leaking service port should not just be ignored and repeatedly regassed. The valve should be replaced and the system retested.
Valve Stem Replacement
Leaking valve stems are a common cause for refridgerant loss. Rubber orings on the service ports wear down over time causing the valve to not seat correctly
£10
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What we do on site -
Initial pressure and leak check
We check the A/C system pressure and inspect both service ports for signs of dye, oil, corrosion, damage or leakage.
Recover refrigerant if required
If the system contains refrigerant, it may need to be recovered safely before valve cores are removed or replaced.
Remove the faulty valve core
The old high-side or low-side valve core is removed using the correct A/C valve core tool to avoid damaging the port thread.
Fit new valve core
A new valve core is installed and seated correctly. Where needed, we also check the service cap and sealing surface.
Vacuum and leak retest
The system is vacuumed and checked again to confirm the replacement valve is sealing properly.