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Its not an air bubble Irene, The insulation to the heater core is very minimal. The sound is the flow of coolant going through and coming out the other pipe. You will here it most when your engine is given gas, Which speeds up the water pump.
It's easy to flush your heater core. I use a garden hose. My same truck as yours, lost heat in the cab. I used the garden hose trick, and flushed the problem away. It's as easy as removing both heater hoses from the heater core, and using an old garden hose that I cut the end off. Luckily, it slipped right onto the heater core inlet. Hooked the garden hose to the water spigot and turned it on. Let it run for a couple minutes. The plug should wash away.
you might want to check the wires going to the temperature sensor on the engine make sure it hasnt rubbed the protective coating off, this can give you a false reading, the safest way is to put a manual gauge in place of the temperature sensor and run engine to make sure the engine is not overheating. You can pick up a cheap manual temp gauge at your local parts store and install the temperature probe into the hole where the temp sensor was located and run the engine. It sounds like you have a guage malfunction. But is better to be safe than sorry.
You may two problems and one symptom. you may have a blend door problem that is not allowing air to circulate threw the heater core. also you may have a bad connection or weak coolant temp sensor showing you erratic readings and it may have nothing with the heat in the vehicle. you need to eliminate or separate the one of the the problems to diagnose your one symptom.
Check coolant level. Check for heat at the heater hose going from water pump to heater core at firewall. Check to see that cable is moving coolant control valve from the closed to open position. Low mileage so it shouldn't be plugged heater core.