Chrysler Other Repair Question
Air conditioning dryer unit
The dryer does exactly what the name implies, it removes moisture from the refrigerant. It also holds refrigerant oil. R0134A inhibits moisture. It is worse than R-12 freon
My rule is to replace the dryer anythime the system is opened to atmosphere. Moisture causes internal A/C issues especially the compressor and reduces cooling efficiency.
There is no rul that i know of after 40 + years as a garage owner to replace the dryer every 3 years except as a sales gimic.
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