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Q: A/C Fush and Expansion Valve Replacement on 1997 Plymouth Grand Voyager

Can front and rear valves be accessed without removing coils?
Can guts of valves be removed to provide a better flush?
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I replaced the drier and the compressor (that had lost lubricant and got hot enough to burn the serpentine belt into after stopping the engine). A local tech thinks the valves are OK due to the temp of the suction line at the compressor, and that the inside airflow seems to be restricted and the mixing door may not be working properly.
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