it could be the thermostat needs changing to
I hope I am wrong, but you could have a blown/leaking head gasket. Sounds like there is compression pressure entering the cooling system.
first make sure you have coolant in your radiator, and if theres coolant and its still not working check your thermostat it may be stuck shut and not letting water into the engine
Bad Blend door in heating system
The radiator cap when bad will allow pressure to go back to the overflow bottle, after that check your thermostat. The coolant system should be pressurized when warm, so much so that the hoses feel hard when squeezed. The radiator cap is made to release the pressure when it becomes too great, if your cap is worn out the pressure will release too early and pressure will blow out to the coolant bottle.
Sounds like it is low on coolant.
Either a cracked head or o-rings on injectors.
Low coolant? Bad thermostat? Heater core plugged, restricted or airbound? Bad heater control? Water pump not circulating coolant?
Low coolant? Thermostat not opening? Heater core restricted or plugged? Heater core airbound? Water pump not circulating coolant? Temperature control not working?
The air in the bottle creates a noise.
It sounds like a jalopy, or it sounds fine. But, you will probably lose coolant throughout the engine and the coolant will mix with the engine oil. Your low coolant light will probably come on a few times a week.
if its winter first check coolant lenvel and check coolant system for leaks. then check thermostat
You shoot it
no heat ford f 150 4.6 no heat ford f 150 4.6 Check the coolant level in the radiator first (NEVER OPEN HOT) most of the time it 's the coolant level being low that causes the heater to not blow hot...