Your heater core is probably getting plugged up. THis is a common problem with any car as the flow through the heater core is not as much as through a radiator which causes silt deposits in the inside of heater core itself. If you replace that your problem should go away. You should be able to feel a difference in temperature of the coolant in the supply line versus the return line going to the heater core. If there's a dramatic difference then the core is plugged.
SOURCE: 1989 chevy silverado heater blowes cold air. both
Feel the hoses going into the heater on the firewall. If one is hot and the other is cool, then the heater control valve is not working for whatever reason. Check the flow valve.
SOURCE: 99 chevy silverado heater doesn't blow hot air,
In addition to faulty actuator motors, the blend door itself can also be broken. This happened on my Tahoe. Typically it is a very labor intensive and costly fix to replace a broken blend door, as the dash must be removed and the plenum assembly replaced. There is a DIY kit from heatertreater.net that provides steel hardware as well as instructions on how to perform the repair by removing the glove box rather than the entire dash.
This is also an alternative to replacing the 'difficult to access' top actuator motor underneath the dash. The kit contains a single blend door which converts the dual control to single control, and is operated off of the bottom actuator motor, which can be accessed by removing the glovebox. If you are having issues with your blend door, or the 'top blend door actuator motor behind the dash' it is worth looking into.
SOURCE: I have Chevy Silverado 2500 Diesel that won't heat up
if your truck has a body lift the space between the bumper and the lower core suport needs to be filled. and if its a suspension lift the air that is now geting redirected up from the front axe needs to be blocked
SOURCE: 2000 Chevy Silverado 4X4 - Heater isn't blowing hot air
No your thermostat is stuck open which will not hurt the engine. but needs to be replaced, the thermostat is what allows the engine get up to operating temp. before allowing water to flow through the radiator and when it is stuck open it doesnt allow the engine to reach operating temp. so the heater never gets hot. I hope that helps you out.
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