Left side would be passenger's side?

The pictures I posted specifically says the fitting is sweated (soldered) to the tube.
The fitting has to be heated, to melt the solder, so the fitting can be loosened without twisting the tube.
If the fitting has had a 1/4 rotation or more then the tube most likely is too twisted to remove the fitting.
I would stop and take a picture of the fitting and tube.
Also take a picture of the driver's side fitting and tube.
Post both pictures.

The driver's side fitting has a compression nut or part that is most like tight against the tube.
Trying to removed the nut may twist the tube on the other side.

Last edited by buoymaker; 05/26/2022 5:16 AM.

"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."