Help fix my washing machine ... please?

My guess is the part of the water valve that controls cold water has minerals or some forgin object wedged in it. Note: there are usually screens at the hose connections of the washing machine valve so, if you haven't already done it, check there too.

The laziest fix would be switch the hot and cold hoses.

Added: I mean hook the hot hose to the cold connection and the cold hose to the hot connection. (Obviously, if you switch connections at BOTH ends of the hose it will do nothing).

But it would be better to disconnect both hoses at the machine, run them to a sink and turn on, if the flow is OK, the problem is in the cold side of the washer valve. This part can easily be removed and dismantled for futher scruitney. Note that, at least for the ones I've seen, the rubber diaphragm between the magnetic actuator and the valve has a tiny hole in it and if it is clogged the valve won't work right. You will probably find some kind of crud lodged in it. It might also be the solenoid for the cold side is not working right. Sometimes you can scavange a usable valve from some other machine that was put out for the trash.

The first thing I'd do is turn the water off, there should be valves at the place where the hoses from the wash machine connects to, then disconnect the hoses from the wash machine. Get them over to a sink, or someplace with a drain, and turn on the hot, then the cold. Does the water come out with approximately the same force out of both hoses?

If so, then the problem is in the wash machine. If not, then you may need to get a plumber.

If the problem is in the wash machine, the most likely culprit is the electronic valve assembly in the wash machine itself. Unfortunately, the assembly isn't repairable, and you will just have to get a new one.

Test the water pressure at the washer. First turn off the water at the valve (under the sink in some cases). Now disconnect the hose at the back of the washer. Turn it on. How's the flow? Good flow... then your right it's in your washer. Bad flow... check the valve. Open and close it a few times to see if you can loosen up any deposits. Disconnect the hose at the valve and check the screen there(if there is one). If it's not the screen, you may need replace the valve. If there is a sink (washtub) nearby you could hook up the cold water hose (if it's long enough) to the faucet and the washing machine... then turn on the cold water tap and run the washer (a temporary option until you have enough cash to replace the valve). Good luck.

The problem may be in the supply valve on the cold water side. If that is okay, then there has to be a check valve on the machine itself. If you have a schematic then you should be able to figure out where or if there is a check valve