You can buy adapter fittings that screw onto the R-12 schrader valves. They're permanent and have loctite on the threads. For some late-model GM vehicles, the fittings can be replaced completely instead of using the adapters.
If you're switching from R-12 to R-134, at the very least you need to pull a vacuum on the system. You need to add ester-base oil when you refill with R-134. But you should really flush the system to get out the old oil and replace the dryer.
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Today's Featured Article - Product Review - by Staff. When we finally checked out the 3000 PSI North Star, the whole story chaned. This unit was equipped with an 11 HP Honda engine with fuel shutoff, adjustable flow and optional syphon degreaser dispenser. It didn't have a pressure release or electric start to facilitate easy starting but according to the instructions, simply pulling on the trigger while cranking was sufficient. This method of starting proved more than adequate and kept the cost down on the unit. It had all the important
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