how can i tell if the ac has been redone for 134a and if it's still using r12 is there a link with video's on how to check for this and procedures for changing it over process..


Asked by Jul 04, 2014 at 07:49 PM about the 1992 Toyota Cressida STD

Question type: Maintenance & Repair

4 Answers


If the system has been converted the service port fittings would have been changed. R12 and R134a service ports are different. This is done on purpose so the wrong refrigerant can't be added. R12 service ports are threaded.R134a sservice ports are not. HTH. -Jim


well , there threaded , so that answer's that... thnxs. JS

1 out of 1 people think this is helpful.

You're welcome. Glad to help. -Jim

Jonathan Murray

R134 low side is larger for 134 then. R12 Take a can with hose 134 see if it fits a if not r12

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