I'm new to the group and 3 ownership. I've got an '04 3s hatchback with 110k miles. After the AC has run for 15-20 minutes it will turn off. The blower keeps working it it only blows vent air. Turning the blower off and back on fixes it for another few minutes. Does anyone else have this issue? Trying to figure out if it's electrical, compressor or R-134 levels. The return line feels cold when it's running. TIA!