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copper tubing
The coil.
An A/C compressor sucks refrigerant gas from the evaporator inside the car and compresses it into high pressure liquid. So the tubing that goes from the evaporator inside the car to the compressor is called the suction line.
More information needed. -Water pipe to where, -tubing, -there are hundreds of kinds of 'tubing' and most water pipes are made from some kind of tubing.
It's near the firewall in the center where the low side tubing returns from the evaporator.
disarticlating
Copper
They are just made of regular steel tubing.
Meee !
usually, the tubing head is the cross-tee connected by flange both at top and bottom. The tubing head is installed on the flange of the casing head, so as to hang the tubing string and seal the annular space between the tubing string and the production casing. The tubing head is made up of the tubing head cross-tee and the tubing hanger.
The evaporator coil is made of copper tubing ran through aluminum fins. The whole assembly is held together by support plates called header plates made of stainless steel. Although stainless steel, it still rusts and corrodes which in turn makes jagged edges where the copper tubing passes. These jagged edges eat into the copper tubing and cause pinhole leaks or worse and are for the most part non repairable, or at least not cost effective to repair. Sometimes you will have a fitting leak that was not welded properly or a heavy contact point that rubbed through, both of which are repairable if accessible. But by far a leaking header plate is most often the culprit. Thicker copper tubing from the manufacture process would help but if anyone would bring back the all aluminum coil we could see the end of leaks. Guess why they don't make them anymore...
steel tubing