How urgent is an Expansion Valve Replacement?
The air conditioning system is extremely important when it comes to your comfort in your car, which I’m guessing you value. That said, it’s not important from a safety feature, unless you’re planning on driving through Death Valley.
So, you can keep driving your car, and you’ll be safe. But you may be super uncomfortable, and you’re probably going to cause further damage to the air conditioning system, which doesn’t seem like the greatest idea to me.