Cold water rinse just trickles on my whirlpool heavy duty top loader

Sounds like a bad water valve

This is an indication that the solenoid on the cold water valve is bad. Or the cold water valve is plugged. If you can get to the valves, use a meter to check the solenoid OR the power to the solenoid. That will tell you if it is bad. If you dont have a meter, switch the wires from one solenoid to the other and see if it fills

Your cold water line is clogged, kinked or the water valve solenoid is not opening all the way. First check the hose, then the screen on the valve for clogs. If none then replace the water valve assembly.

You probably have a cold inlet valve with restricted flow, either because the filter on the inlet valve is clogged or because the cold valve is failing......If you wash on "warm" you have both hot and cold water mixed. On rinse there is probably only cold water used....Check water flow for HOT and COLD settings and you'll probably see the difference...Good luck...Nomess

its a filter inside the water hose thats still blocked or the relay inside the washer for the cold feed is not opening up fully it could just need a clean or maybe a new one fitted

You need to replace your cold water, inlet valve.

Unplug the machine from the power source. Disconnect cold water hose. remove the top cover of the machine. You will see the cold inlet valve/solenoide where the hose fits.

Take note of where the wiring goes. You can get the part from your appliance parts outlet.

Refit, and you should be right to go.

Good Luck.
Ash

water control valve

Try reversing hot for cold hoses and see what happens. That will test your valves, hot water pressure, etc. As far as I know, the valve screens are right where the hoses hook up.

Sounds like cold water solenoid is not opening all the way, its easy to replace, and is found inside the wash machine where the hose connects

remove fill hoses and inspected for debris or cloggs ,,,,