I changed over but kit the mechanic used has bigger valve by hood hinge/brace and it interferes so you actually have to push in on the hinge as you open the hood due to interference. Can't comment on coolant efficiency as a/c components are bad - as soon as one is fixed and system charged, the next leaks and needs replacement. $1000 so far - condensor, dryer, thingamajig and 134 kit, still no air. Have to wait for more money to throw down the pit.