Wow, agree with everyone on all points. This is crazy coming from a sons perspective. If you would have charged him a fee for every time you wiped his butt when he was a kid he would owe you for the rest of his life. Set him straight and let him try find a heated garage for free somewhere else. Sorry so harsh I am just appalled that you have been a good set of parents to him and he tries to charge you for a repair. Parts yes, labor no way.