Buick Repair Questions? Ask a Mechanic for Answers ASAP
Hello I will help,
That is the orifice tube between the pressure ports and it drops the pressure from high to low through it's orifice. It is not a filter but it does have a screen on it to prevent the orifice from clogging with debris.
On one side of the tube is high pressure from the condenser and on the other low pressure headed to the evaporator inside the cabin.
Please let me know if you have further questions
Does that answer your question?