just topped off with redtek. after 1.5 - 2 years AC had gone from cold to slightly cool air. added one can and it's blowing cold again.
one question: while charging i was getting about 38 - 40 psi on the low pressure side and i think tim said the correct range was 21 - 28psi?
i might have a faulty gauge ? but it's working well for now but if anyone has feedback please let me know
here's a photo while charging: the gauge has several color coded ranges for R134A, R12 etc
*also has a highlighted optimal area or 65 - 80psi?