If it smells bad, it won't refrigerant, and if it was, it would only last for a while - like until there wasn't any any more.
It'll be mould in the evap coils. 98 is probably too old to have a cabin (pollen) filter, but you could verify and check that too.
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Is a/c really necessary, in the summer?
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in England, it's acually more necessary - I might even say invaluable - in the Winter
...Loose Rivets knows why