Yes it will stop heating up...........
Yes, A bad thermostat can keep the hot coolant from reaching the heater core... also, low coolant levels or a clogged heater core can make your heat stop working.
Assuming you have checked the water and its topped up, could be thermostat blocked.
System airbound and needs to be purged
It could be a blocked heater core if your fan works... Or it could be your thermostat... I have an 03 that is doing the same thing. I just replaced the thermostat and it is still doing it. There is a site called BlazerForum.com you may get some better answers there
Low coolant? Thermostat not opening? Control cable not working? Plugged heater core? Heater core "airbound"? Low coolant? Thermostat not opening? Control cable not working? Plugged heater core? Heater core "airbound"?
Not enough coolant, water pump and/or thermostat. Add fluid and check to see if there is a leak. If not it's your thermostat.
Low coolant? Bad thermostat? Heater core plugged, restricted, or airbound? Temperature control cable not working?
Thermostat stuck open or a clogged heater core. Service and flush the cooling system and replace the thermostat.
could be thermostat or heater fan if you can hear all the speeds on the blower motor working then it could be your thermostat but your heater core might be plugged as well
Check the thermostat, also there could be a heater core issue...
There could be multiple reasons why a heater would stop working in a truck. There could be low coolant or a bad fuse to make a heater stop working in a truck. The best way to find out the reason is to take it to a certified auto mechanic.
First check the coolant level, a coolant leak would cause a heater to stop working- assuming you mean the blower is blowing but it isn't hot. A stuck thermostat will also cause you problems with your heat.