Bunk ac freightliner century class

Please explain freezing up!

 

It should be wrapped. I cannot remember well now but we had insulation under there.

You are going to frost in the heat 100 degrees versus god knows how cold it is inside that pipe.

 

Cooling works on the principle the changing from high pressure to low pressure causes cooling. A/C systems normally use an orfice tube or expansion valve. The evaporator is after that so the cooled refregerant cools the air going through it and into the cab. If you see a frozen line it is likely after a restriction. After the dryer a restricted dryer, after a hose through the fire wall a bad hose. In your case it looks like the inlet hose is on the right and the outlet, frosted over is on the left. I would thank there is a restriction after the evaporator greater than the expansion valve before it causing the line after it to be cold instead of the evaporator.

 

what i am talk am talking about is internal, refrigerant restriction, not an air flow restriction.