DO NOT HEAT THE AIRCON LINES!!!!!!!!

The trick to it, is slowly slowly, and dont just grab and yank. The more area you can spread the force over, the less chance you have of causing a kink. so if you can use something with a good diameter, you should be fine

(I have done this using the outside of a full unopened beer can on the inside. Personally I would attempt any smaller turn radius without a brake line bender or similar)