My windshield washer is kaput, even though I can hear the pump motor.
I ran a wire through the 4 nozzles, and it will spurt and dribble out the nozzles.
But not 100%, enough to reach the windshield

What next, Is there something buried under the hood insulation, or anything else that can plug up the works?

I looked around for replacement pump motors and the price varies widely from
$10.37 to $49.99. Maybe the impeller is dead in my pump? Is there an easy way to
check it?

Thanks, Bill

as one of the other responders said, very easy to replace the diaphragm in the t-valve. I prefer a piece of nitrile surgical glove since it is thinner material and thus easier to snap the red cap back on. I've retro fitted a handful over the years and the nitrile seems to last forever.
--
The Family Fleet '90 745 16v; '90 745 GLE; 96 855T; 99 XC, collectively approaching 900,000mi and going strong.

Try the pump without any hoses connected.

If it works, work your way toward the nozzles.

There are connections, a check valve, and possibly even a filter.

A check valve looks like a T with a red cap - if you remove the cap, you will find a small spring (do not let it get away!) and a thin disc of flexible material.

I have seen the disc tear, or turn to goop.

You can make a new disc out of a small piece from the cuff of a dishwashing glove - your wife may not even miss it.

Here's the part. Less than I remembered.

https://www.fcpeuro.com/products/volvo-windshield-washer-fluid-t-connector-1392074

Most likely the check valve is plugged up. To get at it remove the insulation from inside of hood and you will see the valve. Lines from pump go in and lines to nozzles go out of it. slip them off and install the new valve. About ten bucks for a new one and it's a DIY 15 minute job.