I AM HOPING THAT MY A/C TESCHS CAN FILL ME IN ON ALL THE TO DO AND NOT TO DOES. WE HAVE JUST SET OUR SHOP UP WITH THE EQUIPMENT TO DO THIS AND HAVE TESTED SOME CARS AT THIS TIME. HERE IN CANADA WE HAVE A LOT OF A/C SYSTEM THAT NEED UP DATEING FROM R12 TO R134A... Login to read more.