* Expansion Valve: This is a relatively inexpensive part located near the evaporator. Since you're already in there, replacing it is a good preventative measure. It's often recommended due to the risk of damaging it during the evaporator replacement process. A failing expansion valve can severely impact the AC system's efficiency.
* O-rings and Seals: Numerous O-rings and seals are involved with the evaporator and its connections. These should *always* be replaced with new ones to ensure a proper seal and prevent leaks. Reusing old seals risks refrigerant leaks which can damage the compressor.
* Accumulator/Drier: This component filters moisture and contaminants from the refrigerant. If the system has been open to the atmosphere for a while (during the evaporator replacement), it's highly recommended to replace the accumulator/drier. This prevents contamination from harming the new evaporator and compressor.
* Evaporator Core Support: This component is the metal frame that the evaporator sits in. If it’s rusty or damaged from corrosion, it may be advisable to replace it. A damaged support might interfere with proper air flow.
Important Note: A professional AC technician will likely recommend replacing the accumulator/drier and all seals/o-rings as a standard part of an evaporator replacement to protect their work and the system's longevity. Skipping these can void warranties and leave you with a poorly functioning or leaking system shortly after the repair.
It's best to thoroughly inspect all components while you have the dashboard partially disassembled. Take pictures before you start disconnecting anything. This will help you during reassembly and potentially highlight any parts that are nearing end-of-life and should be replaced.
