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What makes you think you need to replace those items?
Generally speaking, get under the front cap and remove the front off the HVAC box. The evaporator will be in there, the expansion valve may also be in there or on the outside, depends on the brand of A/C.
Your dash AC is made by Denso. You access the evaporator and expansion valve from under the right side of the dash. It's a real pain in the a$$. On Fleetwood gas coaches the kick panel, in front of the passenger, can be removed. If I remember correctly, the dash has to come off to get the kick panel off, Fleetwood diesels.
follow up...if you pull the carpet off under the dash on the passenger side there are some removable panels and you can access the evaporator and expansion valve.
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