Seem to have lost my charge with the A/C R12. Obviously if there is a leak I believe I would have to convert to the R134. Is this correct or ?

Could the leak be detected by DIY?

Would that be a DIY or indie cost. What would be a good price point for the work?

Thanks.

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Norm K.
'97 E420 Sport
'06 E350 Sedan
'67 Mustang Coupe
'70 F-250
'15 VW Jetta