The EVAP purge valve on your 98 V70 is located on the radiator top left. There are two vacuum lines leading to it.
Most of the time the P0455 code is generated by a defective/loose gas cap and/or a leaking purge valve.
I cleaned the one on my V70 and the problem went away.
There is a black, flat plastic trim on top of the radiator. You will find the valve under the plastic trim.
I need to look into my V70, but I think you are talking about the engine air filter assembly.
The cabin filter is between the engine compartment and the windshield right/lower area.
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