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Well, that's not as bad as needing a evaporator (especially!) or the condensor, it's not that bad of a job. After that of course the AC will need to be purged and recharged, so an extra 100-200. The expansion valve is not that hard to do, neither is the heat valve and aux pump.
In my opinion you could to the expansion valve and service the AC now for summer and plan on doing the heater parts later if you wanted. Ideally it would be better to just do it all, but if you want to spread the work out and want the AC working for summer you could seperate the jobs.
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