My heater on my 00 silverado barely gets warm. It almost seems like the switch isn't turning the heat all the way on, but only half the way.

Has anyone has this before?

 

Changed your coolant yet? The dexcool is notorious for plugging heater cores and radiators. Look at it, if it's brownish you better change it quick before it plugs up everything. Also make sure to flush the cooling system.

Dave

 

Try replacing your in cabin air filter....a little commonly over looked maintence item

 

Ahh I just found out that it also may be temperature control actuator