Final answer:
One action that the client should not perform is taking a hot bath. Instead, the client should drink plenty of fluids, avoid excessive physical activity, and use a fan or air conditioning to cool down if necessary.
Step-by-step explanation:
When being discharged after treatment for hyperthermia, it is important for the client to understand the appropriate actions to prevent another episode. One action that the client should not perform is taking a hot bath. This is because hot baths can raise the body temperature, which can be dangerous for a client recovering from hyperthermia. Instead, the client should drink plenty of fluids to stay hydrated, avoid excessive physical activity to prevent overheating, and use a fan or air conditioning to cool down if necessary.