70 series Kenmore washer

You say not clogged but can you see the entire path? Could it be blocked where it actually drains? If the dispenser is empty you can be sure it is getting to the clothes but perhaps not at the right time.

Or, could be the opposite problem. Is it leaking out during the wash cycle? The seal or gasket can be gone and letting it leak by and wasted before the rinse.

Try poring water in the dispenser and letting it just sit a while and see if it is gone after 15 to 30 minutes. That would confirm a leak. Can it be fixed? If the part is available, yes. Figure $100 to $150 for a service call. Is it worth investing that in a 20 year old machine? Could last another 20 years or could die next week.

Find a parts diagram online at one of the parts stores and see if you can figure out how it's supposed to work, what might be wrong and how it comes apart to fix.