I have a 2000 Chevy Silverado I am getting very little heat from the heater. What could be the problem?

Question edited for clarity and typo, and add maker.
Question moved to model category.

The AC evaporator core and the heating core are normally two separate items. It is unlikely that the heater core is completely clogged. There must be a valve in your flushing circuit.

Videos

https://www.google.com/search?q=2000+Chevy+Silverado+flush+the+heater+core

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Check heater relay switch

I had the same problem, my thermostat was stuck open.. I got one of the more expensive ones ($14) at my local parts store and put it in, now she gets hot quick! before i would almost be to work before i felt any heat

This year of truck did have issues with rear disc brakes. Quality of pads is extremely critical. Go with the AC Delco pads and rotors to eleviate some of the issue. Make sure that the slide pins are liberally lubricated and move freely or drag will cause excessive heat to occur. Let me know if you need anything else.

once truck is warm check both heater core hoses to make sure they are both warm if not then check the cold water valve could be stuck shut not allowing coolant to travel in to heater core.

You can bypass the heater core, you just wont have heat anymore. On the firewall of the truck, behind the engine, you will see 2 rubber heater hoses that go into the firewall. They attach to the heater core. Disconnect them and get a plastic connector, and connect the 2 hoses together with clamps to hold them down. This will stop coolant from going into the heater core, and no more leak.

Had the same thing happen to my truck, the blen door actuator is under the console on passenger side, but the heater core is going to be clogged if you dont have any heat coming through, but a/c works..

YES IT CAN BE REPLACED THE NIPPLES ARE AVALIABLE AT THE DEALER IF YOU DO 1 YOU SHOULD DO THEM BOTH IT DOES TAKE A SPECIAL TOOL TO REMOVE THE NIPPLE IT IS VERY INEXPENSIVE THOUGH

Check blend door actuator for operation

On the inside of the panel that you take off to get to the fusebox there should be a diagram listing what each fuse controls. Try that and see if it works. If not a chevy dealer can always help you