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Air con- use r24 or r134a ?

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Hi guys, i have searched, but cant get definite answer.

 

I have rung a few places but get the usual jokers wanting to replace everything for r134a, but i have done this before on old bmw's+ just vacuumed out the r12+ changed fittings+ refilled?, which i thought you can do on a zed.Mines a 1991 btw.

I now have a guy with r24 drop in gas, but i've seen posts saying its not very good.

I'm confused?? :headvswal

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    I've just had mine done with r134a, they put a new connector on sucked the old out, dropped in a can of r12 > r134a this contains the necessary oils, they did this using the high pressure line but put a low pressure connector on as thats what the can uses. Seems fine much colder than before.

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