how much trouble to put ac back on?

tasvalowna said

I have had some R-12 driers collapse when re charges with 134a and cause a blockage .This is why I recomend replacing them.
And besides if its a universal number 5 or 6 they are under ten bucks , so why wouldnt you change it while you are going
ben

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changing the filter drier is allways recommended when a system has been open for any length of time .and when changing refrigerants as R134 a is a cleansing agent as well as a refrigerant. it tends to flush all kinds of **** from the system eventually ending up in the drier. what i was saying is that just because that same system loses refrigerant later on it is not necessary to change the drier unless the system has run in a vacuum. i don't wash my car when it is allready clean. paul