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Check your thermostat first,could be staying open,not letting your coolant to heat up.If not that then the heater core could be bad.Here's how to check and remove,Here's how to replace heater core.
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.
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.
It can be a couple of things....first one is easy.
1. Low engine coolant level. Just remove the cap on the readiator (engine cold) and check the level of your antifreeze. If it is low, replentish it. This could be your problem.
2. Water pump has failed internally. Easy way to check, start your Benz, squeeze the radiator hose while it is running. Better to do this when the engine is cold. If you start to feel pressure in the upper hose, water pump may still be good. Should feel like rushing water going through the hose.
3. Thermostat. Could be a bad thermostat. If you run the heater and there is no heat but you have air flow...could be the thermostat. Bad air blend door actuator could do this also.
Check the antifreeze usually if the heater is blowing only cold air you are low on antifreeze and the heater coil is not being heated by the flow of antifreeze
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